Heat Pump Suitability Checks

Suitability is not a single yes or no. It is a set of checks that together show whether a heat pump can meet the home heat and hot water demand at a flow temperature the emitters can use, within the electrical supply available and the space the home can offer. A home can pass on heat loss and fail on hot water, or pass on space and fail on emitter size, so each check deserves its own answer rather than a general impression.

The central document is a room-by-room heat loss calculation, which estimates how much heat each room loses on a design cold day. Without it, sizing is guesswork, and later arguments about comfort or running cost have no shared starting point.

A thorough survey looks at wall, roof and floor construction, window sizes and types, airtightness and ventilation, and the actual emitters in each room. It measures radiators or floor circuits rather than assuming them, checks pipe sizes and routes, and asks how the home is used: which rooms matter most, what hot water pattern the household follows, and whether anyone works from home through the day.

It also covers the electrical supply, the position for an outdoor unit or ground array, the space for a cylinder and controls, and any planning or conservation constraints. A survey that never opens a cupboard, measures a radiator or looks at the fuse board has not gathered enough to size a system.

Before a survey visit, prepare a short pack: the EPC or audit, recent fuel and electricity use, the boiler model and age, photographs of radiators with a tape measure in frame, and a note of cold rooms and draughts. During the visit, ask which rooms drive the total heat loss and which emitters would need upsizing for lower flow temperatures.

Afterwards, check that the written proposal names the design outdoor temperature, the design flow temperature, the heat loss total and the hot water assumption. If any of those are missing, ask for them before comparing prices.

In the EU, suitability assessment methods and installer qualification routes are set nationally under the EPBD framework, so the survey format and the paperwork differ by member state. Some countries run formal advisory schemes with standardised reports, while others leave the format to the installer, which makes the written proposal even more important.

In the UK, MCS standards set expectations for certified heat pump design, including heat loss calculation and emitter assessment, and TrustMark covers related consumer protection aspects. Even so, the homeowner should still read the proposal itself, since certification describes the process rather than guaranteeing comfort in a particular home.

A frequent mistake is accepting a survey done entirely from an EPC and a satellite image, with no room measurements and no emitter survey. Another is ignoring hot water: a household with teenagers showering in sequence needs a different cylinder and reheat allowance from a single occupant who showers once a day.

A third is forgetting future changes, such as an extension, a loft conversion or a switch to working from home, which can change the heat load after the system is sized. Raise planned changes at survey stage, not after installation. A final suitability question concerns resilience during cold snaps and power interruptions, including how the home will stay warm if the heat pump is off for a day, whether any secondary heat source exists, and how quickly the system recovers once power returns, since those answers affect comfort far more than a single mild-weather performance figure.

Keep the heat loss calculation, the emitter schedule, the hot water assumptions, the electrical assessment, the siting sketch and every version of the proposal. Those papers make it possible to check later whether the installed system matches the design.

Ask a qualified surveyor: which room has the highest heat loss per square metre, which emitters must change and why, what flow temperature was assumed, and what would change the answer if our household pattern changed. Specific answers show a real survey; general ones do not.