Is My Home Suitable for a Heat Pump? The Honest Answer

Heat pump suitability is probably the question we are asked most often. The honest answer is: most UK homes can have a heat pump installed, but some need preparation work first to get the best results. A few properties are genuinely not good candidates.

This guide explains exactly what makes a home suitable for a heat pump, what commonly needs to be improved, and how to get a professional assessment for your property.

The Key Suitability Factors

A heat pump assessment considers these factors in order of importance:

• Insulation: This is the most important factor. A heat pump works at lower flow temperatures than a gas boiler (35-55°C vs 70-80°C). For this to heat your home comfortably, the building fabric must retain heat well. Good loft insulation, cavity or external wall insulation, and double glazing are all beneficial.
• Radiator sizing: At lower flow temperatures, your radiators need to be larger to deliver the same amount of heat. Many modern (post-2000) homes have oversized radiators that work fine. Older homes with small column radiators may need some upgrades.
• Hot water cylinder: Heat pumps heat water more slowly than a gas boiler and store it in a cylinder. You need space for a hot water cylinder — typically in an airing cupboard. If your current system has a combi boiler with no cylinder, one will need to be installed.
• External space: The outdoor unit is approximately 1m wide x 1m deep x 1.5m tall. It needs to be positioned away from neighbours (within MCS permitted development rules) with reasonable air circulation. Most properties have suitable locations.
• Electrical supply: A heat pump uses 1-4kW of electricity continuously when running. Most standard domestic supplies handle this easily. Very old single-phase supplies in rural properties occasionally need upgrading.

Homes That Work Best Without Changes

A heat pump will work immediately, without preparation, in these property types:

• New builds (post-2012) built to modern energy efficiency standards
• Recently renovated homes with cavity or external wall insulation installed
• Homes with underfloor heating already (ideal flow temperature of 35°C)
• Homes replacing oil or LPG boilers (where running costs drop significantly)
• Properties with larger-than-standard radiators from a previous system upgrade

Homes That May Need Some Preparation

Many pre-2000 homes benefit from one or two improvements before or alongside heat pump installation. The most common are radiator upgrades and loft insulation top-ups.

We assess radiator sizing during your free home survey. A standard 3-bed semi typically needs 3-5 radiators replaced or upgraded, costing £150-£300 per radiator. We factor this into your overall quote rather than presenting it as a hidden extra.

Homes That Are Challenging

Some properties do face genuine challenges. Homes with solid walls and no insulation lose heat faster than a heat pump can economically replace it at low flow temperatures. External wall insulation (or in some cases internal wall insulation) can resolve this, but it adds to the total project cost.

Very old stone cottages, thatched properties, and listed buildings can all have heat pumps — but they usually require a detailed heat loss calculation and often a slightly larger heat pump than a comparable insulated property.

How to Find Out for Certain

The only reliable way to assess heat pump suitability is a proper home survey. We offer free, no-obligation home surveys across East Anglia. During the visit, we carry out a heat loss calculation for every room, assess your existing radiators, check your electrical supply, and survey potential outdoor unit locations.

You will receive a written report including recommended heat pump size, any preparatory work needed, total cost including the £7,500 BUS grant deduction, and projected running costs and savings. Most properties we survey are suitable — and for those that need preparation, we explain exactly what is needed and what it costs.