Plumbing
What belongs in a water heater replacement bid?
Normalize equipment, hidden scope and acceptance records before comparing replacement prices.
Direct answer
A water heater replacement bid should identify the exact heater and price removal, permits, utility connections, venting or air provisions, expansion control, relief and drain work, required supports and restraints, startup testing, and warranty handoff. Each scope line needs a price status and a named responsible party, while the proposal states the hot-water outage and restoration milestone. Compare prices only after the bids cover the same installation and acceptance tests.
On this page
What must a water heater replacement bid include?What should bidders measure before quoting?Which permits and code editions belong in the bid?What makes two proposed heaters equivalent?When do venting, combustion air and conversion work change the scope?What expansion-control work belongs in a replacement bid?What relief, drainage and leak-protection work must be explicit?How do you compare replacement prices on the same scope?Who pays for concealed work, shutdowns and return visits?What commissioning evidence proves acceptance?Worked recovery check: what does a 4,500-watt heater deliver?What warranty documents and maintenance dates belong in handoff?When is the replacement ready for owner acceptance?Open the related tool for the calculation, checklist, or packet.
FieldOS by AnvilfieldOffline-first FieldOS for job photos, proof packets, property memory, calculations, teams, billing, and owner-ready reports.What must a water heater replacement bid include?
Use one bid schedule from isolation of the old heater through restoration of hot-water service. Assign the whole installation boundary before asking for totals.
Give every line one disposition: included, allowance, alternate or excluded. An allowance reserves money for a defined quantity or uncertainty; an alternate changes the selected scope. An exclusion still needs an assigned contractor and a price if the work is necessary to complete the installation.
The following Anvilfield purchasing schedule connects the bid to its completion evidence. A required safety correction remains part of the project when one bidder excludes it.
| Scope line | Required bid entry | Required completion evidence | Basis |
|---|---|---|---|
| Heater | Manufacturer, full model, fuel, voltage, rated storage, input, performance, quantity | Matching nameplate and accepted submittal | S06, S16 |
| Removal | Drain, disconnect, removal route, haul-away and disposal included or separately assigned | Removed unit identified; disposal receipt where contract requires | Anvilfield specification |
| Permit | Applicant, fee treatment, application route, inspection and correction responsibility | Permit number and final status | S01, S02 |
| Water connections | Shutoffs, adapters, pipe material, insulation and any recirculation reconnection | Installed route and leak-check record | S16, S20 |
| Gas or electrical | Supply verification, alterations, isolation and qualified trade scope | Test/startup record and installed supply data | S16, S20 |
| Vent and air | Reuse basis or replacement material, route, lengths, termination, air source | Approved configuration and model-specific startup results | S16 |
| Expansion | Closed-system assessment, tank selection, support and precharge | Model, sizing sheet, pressure and precharge conditions | S07, S19 |
| Relief and drainage | Relief assembly, discharge route, pan, pan drain and condensate as applicable | Endpoint photographs and drainage results | S03, S16, S20 |
| Access and restoration | Door/stair limits, rigging, penetrations, firestopping, finishes | Restored surfaces and access photographs | Anvilfield specification |
| Supports and restraints | Base/stand, load support, anchorage, seismic bracing and impact protection where applicable | Installed support/restraint record against applicable detail | S20 p. 8 for California bracing; project requirements for other cases |
| Commissioning | Fill/purge, leaks, controls, temperatures, performance method and retest | Signed results against stated acceptance basis | S05, S16, S20 |
| Handoff | Manuals, warranty, installation proof, maintenance and owner instruction | Indexed turnover packet | S14, S16 |
| Commercial terms | Taxes, allowances, alternates, exclusions, changes and payment milestones | Signed scope and change register | Anvilfield specification |
The plumbing field guides cover detailed installation procedures.
What should bidders measure before quoting?
Give every bidder the same survey sheet, photographs and access conditions. Record existing and proposed model numbers, rating plates, tank dimensions, door and stair clearances, removal route, floor condition and service access.
Trace the cold supply through pressure-reducing, check and backflow devices. Record static pressure with no draw, pressure during recovery and each gauge location. Keep measured cold-water temperature separate from the winter design inlet temperature used to select the heater.
Survey the whole connection boundary: vent and shared appliances, fuel or electrical supply, drainage destinations, mixing controls and the existing recirculation loop. State whether reconnection includes balancing, insulation, controls and verification at remote outlets.
An occupied school, commercial kitchen and house have different service consequences. Identify occupied hours, protected work areas, permissible outages, temporary hot water and who unlocks the room.
Include abandoned utilities, suspect materials to be disturbed, roof or wall penetrations and restoration limits. Photograph inaccessible routes; assign each an investigation or allowance. Price known work in the base.
Which permits and code editions belong in the bid?
Los Gatos' water heater replacement portal covers the same type in the same location and directs changes of type or location to its Building Permit application route. Its approximately 20-minute estimate concerns completing the application after registration and information gathering, not approval or installation time. S01
Maintain a permit and edition register for the actual authority having jurisdiction (AHJ). Los Gatos is the reference case below; another municipality needs its own adoption record. Use the adoption ordinance, effective date and permit-application date together, following the permit and inspection workflow.
Assign the applicant, fees, inspection booking, correction visits and delivery of the final permit status. The portal supplies neither a fixed fee nor an approval-duration promise.
| Register field | Verified entry | Bid consequence | Source |
|---|---|---|---|
| Reference jurisdiction | Town of Los Gatos, California | Do not carry its permit route into another AHJ | S01 |
| Same type, same location | Replacement portal | Identify permit applicant and fee treatment | S01, undated live page |
| Different type or location | Building Permit application route | Price the applicable submission and review work | S01 |
| State code cycle | 2025 California Building Standards Code; effective January 1, 2026 | Record applicable Title 24 parts for the actual job | S02 |
| Plumbing edition and model-code family | 2025 California Plumbing Code, Title 24 Part 5, based on 2024 UPC; effective January 1, 2026 | Use CPC for this job | S21 printed pp. 16-17; S22 |
| Local amendment record | Ordinance 2380, adopted December 2, 2025; §5 states January 1, 2026 effectiveness; adoption webpage still qualifies local amendments by state-agency approval | Retain AHJ applicability decision and adopted text | S02, S21 |
| Local heater-readiness trigger in adopted single-family alteration text | §150.0(w)3A: removing or replacing wall framing within 3 ft of a gas/propane heater triggers future heat-pump water heater (HPWH) space and condensate provisions | Price triggered readiness work with the alteration | S21 printed pp. 17-19 |
| Local electrical-readiness trigger in adopted single-family alteration text | §150.0(w)3B: adding or altering branch circuits within 3 ft of an existing gas/propane heater, or within 10 ft of its designated future HPWH location, when an electrical permit is required | Price the triggered electrical-readiness option | S21 printed pp. 17, 19 |
| Relief-piping example in this article | ICC CodeNotes dated July 30, 2023, explaining 2021 IPC §504.6 and IRC §P2804.6.1 | Separate I-Code example | S03 |
| Manufacturer basis | Exact heater and accessory manual identifiers | Bid submission includes the proposed unit's documents | S16, S19, S20 |
| Fee and review duration | No fixed amount or approval duration stated by the opened replacement portal | Quote the actual fee separately; enter confirmed schedule dates | S01 |
Apply adopted requirements together with the equipment listing and installation instructions. A newer model code does not become local law simply because it is newer. Resolve a real incompatibility through an approved design or written AHJ determination before purchasing equipment; choosing the larger number is not a method for resolving conflicting requirements.
What makes two proposed heaters equivalent?
Establish the required duty with the water heater sizing and selection guide, then compare complete installed alternatives. First-hour rating describes first-hour hot-water delivery from a heated storage unit under its rating conditions; recovery describes the rate of heating replacement water at a stated temperature rise. Uniform Energy Factor (UEF) is an energy-efficiency metric, not a multiplier for field recovery.
A. O. Smith's August 2026 catalog gives the ENT-50 and ENS-50 the same 46-gallon rated storage and 21-gallon-per-hour recovery at a 90°F rise, but different first-hour ratings of 62 and 57 gallons. S06
| Field | ENT-50 | ENS-50 | Procurement meaning |
|---|---|---|---|
| Nominal capacity | 50 gal | 50 gal | Sales size matches |
| Rated storage | 46 gal | 46 gal | Use published rated storage for planning; measure volume when the test requires it |
| First-hour rating | 62 gal | 57 gal | A 5-gal difference remains despite equal size and standard input |
| Standard element rating | 4,500 W at 240 V | 4,500 W at 240 V | Verify supplied configuration |
| Recovery at 90°F rise | 21 gal/h | 21 gal/h | Same published recovery condition |
| UEF | 0.92 | 0.92 | Energy metric, not a field recovery multiplier |
| Catalog dimension A / diameter C | 59 in / 20.5 in | 49.25 in / 23 in | Compare room height and width, plus service clearance |
Require a substitution to preserve accepted duty, supply compatibility, maintenance access and warranty coverage for the occupancy. Give it a complete installed-price adjustment and approval deadline, including changed connections, vent, drain, circuit, room-air and restoration work.
When changing heater type, compare the installation as a system. Record the selected voltage and element configuration instead of assuming every available configuration carries the table's performance. Reject an equipment-only alternate that leaves necessary conversion work unpriced.
When do venting, combustion air and conversion work change the scope?
Existing vent reuse is a design choice with a price and evidence obligation. Require its condition, listing compatibility, connected load, geometry and termination to support the proposed appliance. Removing one appliance from a shared vent also changes the remaining load; include that assessment in the venting and combustion-air scope.
A condensing conversion needs its specified vent system, condensate route and utility provisions. A heat pump needs room air or ducting and condensate disposal even though it has no combustion flue. ENERGY STAR's general guidance describes manufacturer-dependent air-space requirements; Rheem's AP23657 Rev 01, 2024, supplies the particular layouts and reduced-performance conditions summarized below. S15 S20
| Replacement case | Vent/air scope to price | Expansion scope to price | Completion evidence / source |
|---|---|---|---|
| Atmospheric gas to atmospheric gas | Verify compatible existing connector, vent, shared load and combustion-air method; price repairs found | Assess closed-system devices; select control for installed system | Vent assessment plus accessory sizing; S07, S19 and project heater manual |
| Gas to condensing gas | Listed vent system, termination, condensate drain, electrical supply and gas-capacity verification | Recalculate for system volume and temperature | Model-specific installation submission; S16 |
| Demand Duo RHS199100SE manual example, concentric configuration | 2 × 4 in: 65 ft maximum equivalent length; 3 × 5 in: 150 ft; count 6 ft per 90° elbow and 3 ft per 45° elbow within the limit | Treat the storage system and its cold-side controls as part of the package | Rinnai 100000572(00), 4/2018, printed p. 20; S16 |
| Electric resistance to resistance | Match voltage, element configuration, branch circuit and disconnect; no combustion vent | Identify check/pressure-reducing valve (PRV)/backflow closure and retain or replace correctly sized control | Nameplate and supply record; S06, S19 |
| Gas or resistance to heat pump | Room-air layout, ducting/louvers where required, condensate, electrical work, abandonment/restoration of old gas and vent | Conversion does not remove closed-system expansion needs | Rheem AP23657 Rev 01, 2024; S20 |
| Storage to tankless | Submit continuous flow at the design inlet/rise, minimum activation conditions, gas/electrical supply, vent, service valves and any approved recirculation arrangement | Assess expansion for the resulting piping and any storage; do not copy a storage-tank accessory schedule | Selected tankless manual and project duty; refer to existing type/sizing guides |
| Rheem manual's unducted layout | Larger than 700 ft³: no added ventilation in shown layout; 450 to under 700 ft³ operation carries reduced efficiency/output; smaller-room arrangements require the manual's louver or duct layouts; the reduced-output range does not replace those provisions | Same cold-water-system assessment | S20 p. 7 |
Anvilfield estimates that a 40-ft concentric route with two 90° elbows and one 45° elbow uses 55 ft of the cited Rinnai 2 × 4-in configuration's 65-ft equivalent-length allowance. The method adds physical length and the April 2018 manual's fitting allowances: 40 + 2 × 6 + 3 = 55 ft, leaving 10 ft. Price physical pipe, fittings, supports, penetrations and restoration separately; elbow allowances represent resistance. Apply the manual's terminal and other configuration requirements. S16
Rheem's July 2025 buying guide describes different electrical variants; price the selected model's actual circuit requirements. S09 For a heat pump, identify the operating mode and air arrangement used to promise output; reduced-performance small-room operation is not a promise of full rated delivery.
What expansion-control work belongs in a replacement bid?
Expansion control belongs to the closed water system, so trace its boundary before deciding which accessory to retain. The bid should price potable-water compatibility, vessel capacity and usable water acceptance, connection, support and setup. Use the pressure-control guide when the incoming pressure or closing device needs separate correction.
Amtrol's April 2024 ST-5C(DD) through ST-210VC instructions require matching precharge to cold supply pressure with the tank empty at ambient temperature, vertical mounting and installation between the heater and the closing device. S19
Factory precharge varies by model family. Amtrol's March 2019 guide discusses 40 psi; its June 2023 brochure lists 50 psi for in-line models and 40 psi for vertical models. Set a new tank from measured supply pressure and its own instructions. S07 S17
| Condition / input | Filled rule or example value | Bid item | Evidence |
|---|---|---|---|
| Check, PRV or backflow device between supply and heater | Connection on heater side of closing device | Connection fittings and access | S19 layout and installed photo |
| Precharge | Match measured cold supply with tank empty | Setup labor included | Supply psi, precharge psi, tank-empty condition, gauge ID/date; S19 |
| Orientation for cited ST-C models | Vertical | Independent support as required by installation arrangement | Model-specific manual and support photo; S19 |
| Published sizing example | 240-gal storage, 40°F initial water, 150°F final water, 60-psi line, 125-psi design maximum | Expansion selection | S07, 03/19 example |
| Published sizing results | About 4.3 gal expanded water; about 9 gal total vessel requirement | Select capacity and usable water acceptance | S07; published ST-25V or ST30V-C example, subject to the job's lower code limits |
| Maintenance handoff | Complete heating system including this expansion tank checked yearly, more often with age | Owner maintenance entry | S19 |
Amtrol's March 2019 sizing method multiplies stored water by its expansion factor, then applies a pressure factor to obtain vessel volume: 240 × 1.79% × 2.1 = about 9 gallons. Selection must satisfy both the expanded-water acceptance and total-vessel requirements. The example's design pressure must yield to the job's applicable lower limits. S07
Anvilfield's purchasing rule is to retain an existing tank only with documented model, condition, support, usable water acceptance and correct setup for the replacement duty. Replace failed or undersized equipment. Amtrol's April 2024 ST-C manual permits precharge adjustment only at initial installation and warns against later repressurization, especially with corrosion or damage. Its general FAQ allows supported horizontal mounting for some tanks; the cited ST-C manual requires vertical mounting. Apply the installed model's instruction. S08 S19
What relief, drainage and leak-protection work must be explicit?
Price temperature-and-pressure relief (T&P) discharge, pan drainage and condensate as separate routes. Their purposes and endpoints differ, so a photograph of one does not complete the other obligations. Specify material, route, receptor or termination, access and restoration for each applicable line.
ICC's July 2023 CodeNotes, explaining 2021 IPC §504.6 and IRC §P2804.6.1, describes a full-size, gravity relief line with an air gap in the heater room, an observable endpoint no more than 6 inches above the floor or receptor, and no valve, tee, trap or threaded outlet. Insert-fitting tubing has a one-nominal-size-larger provision and a secured endpoint. For the Los Gatos example, use the adopted CPC detail rather than transferring I-Code dimensions. S03
Rheem AP23657 Rev 01, 2024, prohibits routing condensate into the heater drain pan or joining T&P and condensate piping. Its pan recommendation addresses locations where leakage would damage the building; price the pan and drain required by the actual installation. Include a condensate pump when gravity disposal cannot work, and function checks and owner reset instruction for supplied leak/shutoff controls. S20 pp. 5, 10, 14.
Close these lines with relief-valve identity, discharge material, full-route and endpoint photographs, separate drainage checks and corrected defects. Acceptance dimensions come from the applicable requirement and manual. Demonstrate startup and controls using the installed manual's procedures; never force a relief-limit event for acceptance.
How do you compare replacement prices on the same scope?
Fulton County's November 4, 2024 bid tabulation lists $1,254 and $2,193 for one specified 6-gallon, 120-V electric replacement after normal operating hours. These are submitted bids for a point-of-use replacement, not completed-project costs. S18
| Comparison field | J2 Connect, dba J Squared Plumbing | B & W Mechanical Contractors | Source / result |
|---|---|---|---|
| Quantity and type | One 6-gal compact electric heater | Same | S18 |
| Supply and element | 1,650 W, 120 V, single element | Same | S18 |
| Connections and relief | Side plumbing; factory T&P valve | Same | S18 |
| Included tasks | Heater, remove existing, connect and test new | Same | S18 |
| Working window | After normal operating hours | Same | Item 6 working window |
| Published not-to-exceed price | $2,193 | $1,254 | S18; dated bid prices |
| Dollar spread | $939 above lower offer | Lower stated price | Anvilfield estimates: 2,193 minus 1,254 |
| Relative spread | 74.88% above lower offer | Comparison denominator $1,254 | Anvilfield estimates: 939 / 1,254 × 100 |
| Permit, disposal, detailed test and labor-warranty allocation | Not separately described in item 6 | Not separately described in item 6 | Obtain written scope allocation |
| Pricing input or result | J2 Connect / J Squared | B & W Mechanical | Basis |
|---|---|---|---|
| Published heater replacement line | $2,193 | $1,254 | S18 item 6, after-hours scope |
| Published journeyman rate | $100/h | $55/h | S18 item 4, normal-hours schedule |
| Separate cold-water rerouting outside the heater replacement line | 8 normal-hours journeyman-hours | 8 normal-hours journeyman-hours | Anvilfield purchasing input; labor allowance only |
| Priced common allowance | $800 | $440 | 8 times each published rate |
| Heater line plus common allowance | $2,993 | $1,694 | Base plus priced allowance |
| Difference at common quantity | $1,299 above lower total | Lower priced subtotal | 2,993 minus 1,694 |
| Remaining required scope | Price permit, rerouting materials, disposal and detailed acceptance; deduct overlap with base | Same | Obtain written allocations before comparing complete totals |
Anvilfield estimates the comparison subtotals by adding eight separately ordered normal-hours journeyman-hours for cold-water rerouting to each heater line at Fulton County's November 2024 item 4 rates. Replace that purchasing allowance with surveyed quantities, resolve remaining materials and scope, and remove any overlap with the base before award.
Normalize allowances before comparing totals: remove each included allowance, substitute the same owner quantity priced at each bidder's rate, add required omissions and selected alternates, then deduct documented duplicates or credits. Expressed once, comparable total = base - included allowance + common priced allowance + required additions + selected alternates - credits. Use measured quantities from the plumbing estimating takeoff and attach a quote or clarification reference to every adjustment.
An unpriced required exclusion leaves the comparison incomplete. Obtain matching allocations for permits, disposal, test detail and labor warranty before recommending award.
Public-work clarification must follow the solicitation's permitted process. Estimators preparing water heater replacement scopes use PorchRocket Bid Control to find public plumbing bids and see who won past contracts and for how much.
Record proposal validity, taxes, freight, lead time and payment milestones. A mutually exclusive alternate replaces the original line; it does not purchase both options. Carry rebates and tax benefits separately with eligibility and recipient so an uncertain incentive never masks the installed price.
Who pays for concealed work, shutdowns and return visits?
Assign concealed work a discovery and pricing rule before opening the wall or disconnecting the heater. For inaccessible vent defects, corrosion, inadequate supply, blocked drains or finish damage, require a photograph, description, price and written direction before added work proceeds. Define immediate stabilization within the agreed emergency scope.
Keep base work, owner-controlled allowances, optional alternates and unit-rate changes distinct. State how quantities are measured, which labor classification and overtime rate apply, how material markup is calculated and how unused allowances are credited.
For public work, use the owner's clarification and addendum process and meet its substitution rules. Keep required bond, insurance and wage obligations explicit.
Schedule access, isolation, draining and removal, installation, filling, startup, recovery and inspection separately. Request crew size, working hours, a stated outage window and a temporary-service plan. The Fulton County line specifies after-hours work but supplies no installation-duration benchmark. S18
Define restoration by available hot water at agreed outlets under the stated load. Assign return visits and inspection-booking delays, and keep equipment and permit lead times separate from the occupied building's outage. Use the recovery calculation below as a thermal planning input within the schedule.
What commissioning evidence proves acceptance?
Retain separate records for safe installation, delivered-water performance and administrative closeout. Complete each before owner acceptance.
Price the test method, measurement points, operating mode, instrument accuracy, witness, correction and retest before award. Record inlet temperature, flow and storage state with the result. Establish the project's storage and mixed-delivery temperature schedule before using a tap reading to judge the heater.
| Test or record | Conditions to capture | Pass / hold basis | Retained evidence |
|---|---|---|---|
| Installation/startup | Model/manual, full tank and air purge before energizing, utilities, controls and leaks | All applicable manual and inspection items complete | Checklist, readings and correction log; S16, S20 |
| Vent/combustion, gas | Configuration, connected loads, operating state, test method | Named model/code procedure satisfied | Vent/combustion record, not just flame photo; S16 |
| Expansion | Static pressure, tank-empty precharge, pressure through recovery | Selected system/design criteria satisfied | Gauge readings with conditions; S19 |
| Draw-off, Bradford White diagnostic method | Fully recovered tank, successive measured 3- or 5-gal draws, temperature at each increment | Bradford White bulletin: at least 70% of rated capacity with less than a 30°F drop from the highest draw reading | Volume/temperature series; S05 |
| Recovery | Input/mode, cold inlet, target/storage temperatures, load history, start/end definitions | Compare against selected model at equivalent conditions and agreed method | Time-temperature log and input data; S06 plus contract method |
| Delivered temperature | Storage, mixed outlet and agreed fixtures, with flow and stabilization | Project temperature-control schedule | Thermometer readings and valve settings |
| Condensate / leak controls | Selected appliance configuration and drain/shutoff test | Manufacturer function check complete | Drain and control test record; S20 |
| Closeout | Correct model/serial, installation date, manuals, warranty and permit | All contracted records delivered; open defects assigned | Indexed packet; S14 |
Bradford White's draw-test bulletin, updated July 2024, uses a fully recovered tank and measured draw increments. For 50 gallons of rated capacity, 70% is 35 gallons, or seven 5-gallon increments, with less than a 30°F drop from the highest draw reading. Retain the volume-temperature series and mixing arrangement; use the selected manufacturer's applicable procedure. S05
Stored-water draw-off, recovery and laboratory first-hour rating answer different questions. Normal draw-off with slow recovery directs diagnosis toward input, supply, mode and temperature rise; rapid outlet cooling with adequate recovery directs it toward storage delivery, crossover, mixing or demand. Compare conditions before condemning the heater.
Verify fill and air purge before energizing: Rheem AP23657 Rev 01, 2024, prohibits operating an empty or partially filled tank. Record effective input from the installed wiring and operating state. S20 p. 14.
Worked recovery check: what does a 4,500-watt heater deliver?
Anvilfield estimates a full rated-volume equivalent heating interval of about 131 minutes for the A. O. Smith ENS-50 by dividing its August 2026 catalog storage of 46 gallons by its 21-gallon-per-hour recovery at a 90°F rise. That calculation uses the standard 4,500-W, 240-V configuration. S06
The temperature rise is the difference between incoming water and the target storage temperature. A stratified tank's thermostat endpoint does not automatically represent uniform heating of its full volume.
| Quantity | Value | Authority / calculation |
|---|---|---|
| Selected catalog configuration | A. O. Smith ENS-50, 4,500 W at 240 V | S06, August 2026 |
| Rated storage | 46 gal | S06 |
| Catalog recovery condition | 21 gal/h at 90°F rise | S06 |
| Full rated-volume equivalent heating interval | 2.19 hours, approximately 131 minutes | Anvilfield estimates: 46 / 21 × 60 |
| Field acceptance duty and tolerance | Project-specific values stated in the accepted bid schedule | Contract method with defined endpoints and model-specific basis |
Method: divide the August 2026 catalog's rated storage by recovery, then convert hours to minutes. Holding effective input and configuration constant, Anvilfield estimates about 102 minutes at a 70°F rise and 161 minutes at a 110°F rise by scaling the unrounded interval in proportion to temperature rise. Record measured input, inlet temperature, draw history and endpoints for the field comparison.
Use a written recovery method with defined starting and ending storage conditions. Compare the field result with the selected model's published duty at equivalent conditions; for a heat pump, include ambient-air conditions and operating mode. S06 S20
| Schedule field | Entry and required action | Acceptance decision |
|---|---|---|
| Equipment and rated basis | ENS-50, 46 gal rated storage, 4,500 W at 240 V, 21 gal/h at 90°F rise; S06 August 2026 | Installed model/configuration and supply match the accepted submittal |
| Field method and endpoints | Bidder names the applicable manufacturer procedure or submits a method defining storage states, sensor locations, draw/recirculation loads and endpoints | Owner accepts the written method before award; a mixed faucet temperature alone does not establish stored energy |
| Purchased duty and tolerance | Bidder supplies the guaranteed recovery/delivery result, its inlet/storage conditions and numerical tolerance under that method | State the purchased numerical result and tolerance before award; use the energy estimate to plan the outage |
| Measurement record | Supply/input, inlet/storage/mixed temperatures, operating mode, measured draw volume/flow, start/end times, instrument accuracy and witness | All conditions needed by the method are recorded; changed test conditions require an accepted revised comparison |
| Pass, correction and retest | Compare recorded result against the accepted numeric duty/tolerance; document defect, cause, corrective scope and repeated result | Release performance item only when it passes; include correction/retest responsibility and cost in the bid |
Keep failed readings with the correction and repeat-test results so the final signature has a traceable basis.
What warranty documents and maintenance dates belong in handoff?
Compare tank, heat exchanger, other parts and labor separately. Bradford White's March 2025 limited residential warranty excludes removal, installation and reinstallation costs, so tank coverage and the cost of an installed replacement must be compared separately. Its exclusions also cover installation materials and permits, subject to applicable law. S14
Occupancy is a coverage condition. The cited Bradford White document addresses malfunction caused by excessive use, including nonresidential or commercial use; its reduced-duration language alone does not establish coverage for a school. Obtain the actual product warranty for the proposed application before purchase.
| Document / application | Verified term | Bid and handoff consequence |
|---|---|---|
| Bradford White 238-39699-00ZAN, 03/25; model prefixes listed in that warranty | Covered tank periods 1, 6, 8 or 10 years by model; parts generally 6 years, subject to stated exceptions | Attach exact model coverage and intended occupancy |
| Same document, installation proof | Without proof, start is 3 months after manufacture | Retain dated installation invoice |
| Same document, non-single-family use | 1-to-8-year tank models reduce to 1-year tank/parts; 10-year tank models to 3-year tank/1-year parts, subject to document limitations | Resolve applicability for multifamily/public work before purchase |
| Rinnai RHS199100SE system manual 100000572(00), 4/2018 | Residential heat exchanger 15 years or 12,000 operating hours, whichever first; tank 6 years; other parts 5 years; reasonable labor 1 year; integrated-controller parts 1 year | Keep component-specific terms and operating-hour condition together; S16 printed p. 49 |
| Same Rinnai warranty, temperature/occupancy conditions | Settings above 160°F reduce the heat-exchanger period to 8 years or 12,000 operating hours, whichever first; commercial heat-exchanger column states 8 years | Verify application and setpoint against the purchased warranty, not the residential headline; S16 p. 49 |
| Same Rinnai manual, tank maintenance | Recommends inspecting anodes every 2 years, yearly with softened water; replace when more than half consumed; drain a pail at least yearly | Put these dates/tasks in this model's handoff; S16 p. 46 |
| Amtrol cited ST-C manual, 04/24 | Yearly system/expansion-tank professional check, more often with age | Include accessory maintenance, not just heater maintenance; S19 |
The cited Rinnai warranty accepts a dated sales receipt or registration within 30 days as purchase evidence and says registration is not necessary to validate that warranty. Bradford White's March 2025 document gives a covered replacement the remaining original term. Save the purchased warranty revision with the installation record. S14 S16
Build the maintenance calendar from the installed heater and accessory manuals. Use the anode, flushing and T&P maintenance guide for service planning and the callback and warranty tracking guide for claims.
Warranty-document checklist
- Full heater model, serial, asset tag, installation address and installed date recorded.
- Invoice and proof of installation saved with the rating-plate photograph.
- Installed heater manual and every relevant accessory manual saved by document number/revision.
- Written warranty identifies covered component, duration, occupancy, start date, exclusions and transfer conditions.
- Installer labor warranty states its own term, dispatch/contact process, travel/removal/reinstallation allocation and exclusions.
- Registration or extended-coverage confirmation supplied where the purchased warranty requires it.
- Permit and final inspection record included with completed correction notices.
- Commissioning results, setpoints, mixing/recirculation settings and accepted performance method delivered.
- Maintenance calendar states actual model requirements for anodes, sediment, filters, condensate and accessories.
- Owner instructed in normal operation, isolation, fault reporting and who handles claims.
- Warranty replacement process and retention of failed parts/rating plate explained using the actual warranty.
When is the replacement ready for owner acceptance?
Release the replacement when the installation, purchased duty, required approvals and commercial record are complete. Use this Anvilfield contract scorecard with each line marked complete, hold or not applicable with a reason. A hold on required safety, performance or approval work prevents final acceptance.
Name and date each approval. Close the correction list or explicitly accept a nonsafety punch list with a completion date, responsible party and agreed payment treatment. Match final payment to the contract and applicable procurement terms.
Final field scorecard
- Installed unit matches the approved model and any signed substitution.
- Every bid-inclusion line has completed scope and its evidence.
- Changed work has written price/direction and allowance reconciliation.
- Gas/electric, vent/air, relief, expansion and drainage checks are complete for the installed system.
- No unresolved leaks or safety defects remain.
- Recovery/delivery records satisfy the agreed method under documented conditions.
- Required inspections are finaled and records delivered.
- Removed equipment and waste are handled; access and finishes are restored.
- Warranty packet and maintenance calendar are delivered.
- Owner instruction and acceptance are recorded; final invoice matches authorized scope.
Update log, November 5, 2026: clarified model-specific installation limits, bid allowances, draw-test conditions and recovery acceptance records.
How to cite this page: Anvilfield, What belongs in a water heater replacement bid?, 2026, https://anvilfield.com/field-guides/plumbing/water-heater-replacement-bid-scope-acceptance/
FAQ
What should a water heater replacement quote include?
Equipment, removal, permits, utilities, vent or air work, expansion, relief and drainage, supports, testing and handoff. Each item needs a price status, responsible party and completion evidence; include the outage and restoration milestone.
Is a permit needed to replace a water heater in the same place?
Los Gatos offers a permit route for same-type, same-location replacement and sends type or location changes to its Building Permit route. Record the actual jurisdiction's route and adopted editions in the bid.
Does a replacement quote include an expansion tank?
Require explicit expansion assessment, then price any required tank, support, connection and setup. Retaining an existing tank requires documented condition, capacity and correct setup for the new duty.
Can the old water heater vent be reused?
Require documented compatibility, condition and sizing for the new appliance and any remaining shared load. Price identified repairs, revised termination work and the selected startup procedure.
What hidden costs should I ask about?
Ask about concealed pipe and vent defects, supply upgrades, drain routing, access, finish restoration, overtime and return inspections. Give each unresolved condition a discovery rule and priced allowance or change mechanism.
What did bidders quote for the public replacement example?
Fulton County's November 2024 submitted bids were $1,254 and $2,193 for one specified 6-gallon, 120-V electric replacement after hours. The separate normal-hours rerouting labor allowance produces separate comparison subtotals of $1,694 and $2,993 before unresolved required scope.
Is first-hour rating the same as recovery rate?
No. A. O. Smith's August 2026 ENS-50 catalog entry lists 57 gallons of first-hour delivery and 21 gallons per hour of recovery at a 90°F rise. Preserve both ratings in the equipment comparison.
How long should the replacement heater take to recover?
For the cited ENS-50 configuration, Anvilfield estimates about 131 minutes for its full rated-volume equivalent at the catalog's 90°F rise. Field acceptance requires defined endpoints and a numerical duty and tolerance under the agreed test method.
Does a tank warranty pay for installation labor?
Compare the actual terms: Bradford White's March 2025 residential warranty excludes installation and reinstallation costs; the cited April 2018 Rinnai manual provides a separate one-year reasonable-labor term. Keep component coverage and installer obligations distinct.
What records should I receive before final payment?
Require the contract-specified final permit record, completed test results, resolved changes, manuals, installation proof, warranty terms, maintenance calendar and signed acceptance. Reconcile allowances and authorized changes against the final invoice.
People also ask
Codes cited in this guide
This guide is written and reviewed against the published standards below. Always confirm the current adopted edition with the authority having jurisdiction.
Sources checked
- S01. Town of Los Gatos, Apply for a Water Heater Replacement, undated live page. Reopened with curl November 6, 2026.
- S02. Town of Los Gatos, Current Adopted Codes, 2025-cycle announcement. Reopened with curl November 6, 2026.
- S03. ICC, CodeNotes: Water Heater Safety in the I-Codes, July 30, 2023. Reopened with curl November 6, 2026.
- S05. Bradford White, Insufficient Hot Water / Draw Test Procedure, posted November 25, 2019, updated July 19, 2024. Reopened with curl November 6, 2026.
- S06. A. O. Smith, residential/commercial product catalog AOSAA80000, copyright August 2026. Reopened with curl November 6, 2026.
- S07. Amtrol, Sizing the Therm-X-Trol, MC10007 / 9017-112, 03/19. Reopened with curl November 6, 2026.
- S08. Amtrol, Plumbing and Hot Water Support, undated live FAQ. Reopened with curl November 6, 2026.
- S09. Rheem, Heat Pump Water Heater Buying Guide, filename updated 07/17/25. Reopened with curl November 6, 2026.
- S14. Bradford White, Limited Residential Water Heater Warranty, 238-39699-00ZAN, 03/25. Reopened with curl November 6, 2026.
- S15. EPA ENERGY STAR, Heat Pump Water Heater Frequently Asked Questions, undated live program guide. Reopened with curl November 6, 2026.
- S16. Rinnai, Demand Duo RHS199100SE Residential Hybrid System Installation and Operation Manual, 100000572(00), 4/2018. Reopened with curl November 6, 2026.
- S17. Amtrol, Therm-X-Trol brochure MC4090, 06/23. Reopened with curl November 6, 2026.
- S18. Fulton County, 24ITB0617C-MH Standby Plumbing Repair Services bid tabulation, opening November 4, 2024, sheet 1 item 6. Reopened with curl November 6, 2026.
- S19. Amtrol, Therm-X-Trol ST-5C(DD) through ST-210VC Installation & Operation Instructions, 9017-091, 04/24. Reopened with curl November 6, 2026.
- S20. Rheem, Hybrid Electric Water Heater Use & Care Manual, AP23657 Rev 01, ©2024. Reopened with curl November 6, 2026.
- S21. Town of Los Gatos, adopted Ordinance 2380, December 2, 2025. Reopened with curl November 6, 2026.
- S22. ICC, 2025 California Plumbing Code, Title 24 Part 5, publisher's public edition page. Reopened with curl November 6, 2026.