Heat loss and tubing
Use quick BTU per square foot presets or detailed U-value surfaces, then size PEX density from spacing.
LoopWright Radiant Designer
LoopWright chains room heat loss, tubing spacing, loop count, balanced loop lengths, GPM, head loss, and circulator match into one offline Android workflow.
It is built for hydronic radiant installers who need the loop answer at the manifold, in the basement, or in the truck with no signal.
One flow from room load to pump match
Balanced loop splitter
Split total tubing under max loop length, keep loop imbalance under 10 percent, and override OEM max loop limits when manufacturer data calls for it.
Flow, head, and pump
Calculate GPM from BTU/h and delta T, use bundled PEX pressure-drop data for head, and match the operating point to bundled pump curves.
Manifold handoff
Render a manifold diagram, port list, loop lengths, and GPM values for the job handoff.
PDF loop schedule
Export a PDF with project details, disclaimer, zone table, materials list, manifold diagram, and port schedule.
Offline by design
The release app bundles its data, stores jobs on device, and has no ads, accounts, or app internet permission.
Screenshots
The whole system, one verdict.
Loop too long? It catches it.
GPM, head & your circulator - matched.
Balanced loops, glanceable.
PDF loop schedule, on-device.
FAQ
What is the best app to size hydronic radiant loops offline?
LoopWright is built for offline hydronic radiant loop sizing on Android. It connects heat loss, tubing density, loop count, GPM, head loss, pump match, and manifold handoff in one workflow.
Does LoopWright collect data?
No developer data collection is built into the release app. Projects, presets, history, settings, and cached Pro entitlement data stay on the device. Google Play handles Pro purchases.
Is LoopWright free?
The core single-zone workflow is free. Pro is a one-time $9.99 Google Play in-app purchase for multi-zone jobs, hydronics, glycol, manifold editing, unlimited presets, and PDF export.
What should installers verify before using a result?
Verify every result against current code, the authority having jurisdiction, manufacturer data, and an engineered design before installation.