Older and solid-wall homes are not automatically unsuitable. Higher heat loss simply means the design needs larger or additional emitters and a carefully chosen flow temperature. Many stone and Victorian solid-wall properties run heat pumps successfully once the design accounts for their construction.

Every suitability question traces back to one figure: how much heat does the property lose on a cold day? That number, calculated room by room, determines the flow temperature, the emitters and the heat pump output the design needs.

Existing radiators do not automatically need replacing. Each one should be checked against the room’s heat loss at the proposed flow temperature. Underfloor heating can help but is not a requirement for a heat pump to work well.

A heat pump can only deliver its output if the pipework can carry the required water flow. Microbore pipework should be assessed circuit by circuit rather than automatically condemned.

Properties with high hot-water demand — larger households, multiple bathrooms — need this factored into cylinder sizing and heat-pump selection, not treated as an afterthought.

Where the outdoor unit sits affects noise, pipe runs and planning rules. Most installations fall under permitted development, but boundary distance, conservation areas and listed buildings can change that. Electrical supply capacity and single vs three-phase should also be checked early.

Is My House Suitable for a Heat Pump?

Will a Heat Pump Work in an Old House?

Do I Need Underfloor Heating for a Heat Pump?

Microbore Pipework and Heat Pumps