Measured, not modelled, U values

Know how a building
really performs.

Peltyr is a low cost, wireless heat flux sensor that measures a building's real U value in situ, turning thermal performance you can't see into hard data you can trust.

Buy the sensor See how it works
Live · heat flux through wall
0.19W/m²K
Measured U value · 2.6 W/m² heat loss
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Order your hardware.

Demand is high and units ship in limited batches. Pay by card at a secure Stripe checkout, or reserve and we'll confirm availability and delivery by email.

How it works

Don't guess. Measure the truth.

Most retrofit decisions are still guesswork, and an energy rating can sit far from reality. Peltyr gives you a measured U value you can act on.

  1. 01

    Sense

    Printed heat flux sensors mount onto the wall, floor or roof you want to measure.

  2. 02

    Log

    A battery powered wireless unit records readings over a short test period and uploads them automatically.

  3. 03

    Report

    You get a measured U value, a mould risk picture and a clear report you can act on.

See it work

How heat moves through a wall.

A surface reading only tells you so much. Peltyr tracks the heat that actually passes through the fabric and turns it into a measured U value.

Technical specification

Built for real measurement.

Heat flux sensor

Type
Printed heat flux sensor
Range
±200 W/m²
Sensitivity
4.7 µV per W/m²
Accuracy
±5% of reading
Board size
63.5 × 47 × 0.4 mm
Calibration
Available as an option

Datalogger unit

Channels
3 differential ADCs
Converter
24 bit
Sampling
1 second to 60 minutes
Power
2 lithium cells, up to 24 months
Wireless
Secure mesh, up to 20 m in ideal conditions
Rating
IP54, encrypted, wireless updates

Where it's used

One sensor, three urgent jobs.

Plan a retrofit

Know what to fix before you spend. Measured U values stop you investing in the wrong improvements.

Prove it worked

Measure before and after to show the work delivered, not just that it was fitted.

Monitor continuously

Keep measuring heat loss while you track temperature, humidity and mould risk to keep homes healthy and compliant.

For retrofit assessors, housing developers, housing associations, performance testers and local authorities.

Get in touch

Be an early Peltyr partner.

Tester, developer, housing provider or researcher: if you need the truth about how a building performs, we'd like to hear from you. Reserve a sensor above, or write us an email.

Write us an email Buy a sensor

Based in Manchester, United Kingdom.