Optimisation
ΔT — the temperature difference between flow and return — is the fastest way to assess hydraulic condition. A gap that's too large or too small points to a flow-rate problem.
Typically 3–5 K for underfloor heating, 5–8 K for radiators at full load. On a ground-source heat pump's brine side, typically 2–4 K.
A large ΔT can indicate too low a flow rate: a clogged filter, partially closed valves, or too slow a circulation pump. A very small ΔT can indicate too high a flow rate or bypass.
These are indicators, not a diagnosis — we recommend logging the readings and having them assessed.
Most units show both temperatures on the control panel. Alternatively, surface sensors on the pipes can be used.
We recommend doing this together with a specialist, since the wrong flow rate can trigger protective shutdowns.
Run a free estimated analysis — answer a few questions and get an estimate of efficiency and savings potential.
Start analysis