A comfortable heat-pump home begins with proper design, not simply replacing a boiler with an outdoor unit. Established estates, newer homes and extensions provide a range of generally practical heat-pump retrofit scenarios.
Our team brings the outdoor unit, internal plant, emitters and controls into one coordinated design. Learn more about the wider service on the air source heat pump installation page.
Heat-loss calculations distinguish efficient newer construction from original rooms or altered roof spaces. A room-by-room calculation establishes the output needed in colder design conditions. It provides the basis for appliance size, emitter output and operating temperature without relying on the previous boiler rating.
Some radiators may be retained while others need resizing; this is determined by room output at the proposed flow temperature. Each room is checked for required output at the proposed water temperature. This shows which emitters can remain, which may need more surface area and whether pipework or balancing work belongs in the scope.
Outdoor space, drainage and the route back to internal equipment should be resolved together. The design considers airflow, recirculation, condensate drainage, service clearance, pipe length and visual impact together. The quietest-looking corner is not always the best technical position.
Future solar PV or EV charging can be discussed alongside electrical capacity without confusing the heating design. Heat pumps often perform best with steadier operation and weather-responsive control rather than short, high-temperature boiler bursts. Handover should explain schedules, set points and when manual intervention is actually useful.
For this part of the design, the survey uses property evidence rather than a standard allowance. Supply capacity, protective devices, cable routes, controls and any other large electrical loads should be reviewed. Cylinder and internal equipment positions also need safe access and sensible service clearances.
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Potentially. Heat-loss calculations distinguish efficient newer construction from original rooms or altered roof spaces. Suitability also depends on emitters, hot-water needs, electrical supply and a workable outdoor position, so a survey and room-by-room design are required.
Sometimes. Each radiator should be checked for the room heat loss at the proposed flow temperature. Some may be retained, while others may need more surface area or a different design. Pipework and system balancing also matter.
They can work well together because underfloor heating may deliver the required room output at lower water temperatures. The floor build-up, pipe spacing, controls and room heat loss still need to be checked.
Not automatically in every home. The result depends on previous fuel and system efficiency, heat demand, electricity tariff, flow temperature, controls and household use. A proposal should estimate performance from the property rather than promise a universal saving.
Usually not exactly. Heat pumps often favour steadier, lower-temperature operation. Weather compensation and well-set schedules can support comfort and efficiency. The installer should demonstrate the controls and explain normal operation at handover.
Eligible property owners may receive Boiler Upgrade Scheme support. The scheme is installer-led and an MCS-certified installer applies on the owner’s behalf. Eligibility and the grant available should be confirmed for the property and technology at the time of application.
