Section · Heat pumps
The survey, the radiator sizing and the flow temperature are the entire story. The hardware is mostly interchangeable once you have those right.
In this section
The single most important document in a heat pump install.
Why almost everyone ends up with air source, and the narrow ground-source cases.
Most existing rads are too small. We do the maths.
The number that decides comfort and efficiency. Get it wrong and the system runs hot.
Sound levels in 2026. Better than 2018, still not silent.
£7,500 off an ASHP install. The eligibility detail.