Energy Stack / Heat pumps
Heat pumps
The survey, the radiator sizing and the flow temperature are the whole story. The hardware is mostly interchangeable once you have those right. Get the survey wrong and even an expensive install can end up running hot and uncomfortable.
Guides
Survey
The single most important document in a heat pump install. What a good one looks like.
Hardware
Why almost everyone ends up with air source, and the narrow cases where ground source is worth it.
Radiators
Most existing rads were sized for an 80°C flow. A heat pump wants 45-55. The maths usually says some need replacing.
Flow temp
The number that decides whether the system is comfortable and efficient at the same time.
Noise
Quieter than 2018, though still audible up close. What the figures mean and where to put the outdoor unit.
Grants
£7,500 off an ASHP install. The eligibility detail is worth reading before assuming you qualify.