Underfloor return temperature: what it indicates about operation

The return temperature is a useful indicator to understand how much heat the circuit is delivering to the space.

Large supply-return differential

It may indicate low water flow or high heat absorption.

Small differential

It may be related to high flow or low demand in the space.

Loop comparison

Large deviations between loops may indicate a need for better balancing.

Correct diagnosis

The return temperature is evaluated in conjunction with flow rate, supply temperature, and thermal load.