Updated 20 October 2026.
A heat pump can be suitable for an older home as well as a new build. Property age alone does not decide the answer: the heat-loss assessment, heating design, installation and how the system is used matter. This update replaces the blanket advice in our original opinion article.
What should a retrofit survey establish?
- Room-by-room heat loss and practical insulation improvements.
- Radiator or underfloor output at the proposed water temperatures.
- Pipework flow capacity, pump requirements and control strategy.
- Outdoor-unit location, noise assessment and relevant permissions.
- Hot-water provision, space and electrical supply requirements.
Underfloor heating can work well, but it is not a prerequisite. Existing radiators may be usable or may need changes. There is no universal “double every radiator” rule; output must be checked for the actual temperature regime and room requirement. Small-bore pipework also needs assessment, not automatic condemnation.
Will running costs fall?
Compare your actual fuel tariffs and expected seasonal system performance. Useful heat cost can be estimated as electricity price divided by seasonal performance for a heat pump, or gas price divided by boiler efficiency for a boiler. Include standing charges where relevant and use consistent units.
This comparison is not a guaranteed saving. Hot-water use, weather, controls, backup heating and tariff structure can change the result. Do not base a payback calculation on an unattributed search snippet or somebody else's monthly bill.
Grant information as of October 2026
The earlier £5,000 grant example is obsolete. GOV.UK currently lists £7,500 for eligible air-to-water and ground-source heat pumps, with a temporary £9,000 option for qualifying oil/LPG-heated properties without a mains-gas connection. Check the current amounts, dates and eligibility directly before budgeting. The Boiler Upgrade Scheme covers England and Wales and uses an MCS-certified installer application process; a quotation does not itself establish eligibility.
Compare complete proposals
Ask for the full installation cost, proposed grant deduction, emitter and pipework changes, hot-water solution, commissioning and aftercare. Compare that with the realistic alternative: repairing a functioning system or replacing it when needed. Neither a new build nor a major renovation automatically guarantees a successful design.
Explore our air-source heat-pump services and contact the team to discuss a property assessment. Confirm the installer credentials and scheme arrangements for any grant-funded proposal.
Further reading: GOV.UK: current Boiler Upgrade Scheme support. Checked 20 October 2026.
