What is air source heat pump installation?
A first heat pump installation brings together the outdoor unit, hot water storage, heating emitters and controls. The aim is to supply each room with enough heat at the chosen water temperature, rather than simply replace a boiler with a box of similar rated output.
Signs you may need air source heat pump installation
- An ageing gas, oil or LPG boiler is approaching replacement, or an oil tank also needs attention.
- Storage heaters are costly to run or leave rooms unevenly heated.
- A renovation offers access for new pipework, larger radiators or underfloor heating.
- You want a measured comparison between keeping the existing system and moving to a heat pump.
What the specialist checks and does
- Measure rooms, glazing and insulation, then calculate room-by-room heat losses.
- Check radiator outputs and pipe sizes at the proposed flow temperature.
- Choose the cylinder, outdoor base, pipe route, drainage and electrical supply.
- Protect floors, install equipment and arrange safe removal of the redundant heating system.
- Flush and fill as specified, balance the heating, commission controls and explain operation.
Ask why a buffer vessel or volumiser is included if one is proposed. These serve different purposes and should follow the hydraulic design. Microbore pipework needs assessment of flow and pressure loss; its presence does not automatically mean a full repipe. The cylinder must suit the heat pump and household demand, including bath use and recovery time.
Before you ask for a quotation
Give the current fuel, property type, approximate floor area, insulation improvements and number of occupants. Mention extensions, underfloor heating, cylinder space and difficult side access. Photographs of radiators and the proposed outdoor position help with initial discussions, but cannot replace the final design checks.
Indicative cost and time
The site’s UK guide is £7,000–£14,000. Before grants. Cylinder size, emitter changes, electrical upgrades, pipe runs and making good can move the price substantially; extensive retrofits may exceed the guide.
The indicative timeframe is 2–5 days. Confirm what this covers, availability and any separate equipment lead time with the firm.
Qualifications, funding and permissions
Planning rules vary between UK nations and depend on the property and proposed unit. Do not assume an existing heat pump position or a neighbour's installation gives permission for yours. Check siting, noise, listed-building restrictions and any freeholder consent before ordering. Building Regulations and any required electrical or unvented-cylinder certification must be dealt with separately; MCS certification alone is not a blanket building-control approval. Read the Planning Portal guidance for air source heat pumps in England and confirm the position for your UK nation and property.
If an existing gas boiler needs disconnecting, use a Gas Safe registered engineer competent for that work; see HSE guidance for homeowners. Confirm who is responsible for electrical work, cylinder safety and the required certificates.
Finishing the job and keeping records
Agree the heating and hot water shutdown before work starts. Ask for heat-loss calculations, emitter schedules, commissioning records, applicable certificates and warranty registration. Confirm who handles first-winter adjustments and what the service schedule requires.
Frequently asked questions
Will every radiator need replacing?
No. The designer should compare each radiator’s output at the proposed water temperature with the room’s heat loss. Some may remain, while others need increasing or changing.
Can an older house use a heat pump?
Possibly. Building age alone does not decide suitability. Heat loss, insulation, emitter capacity, available space and the proposed running costs need to be assessed together.
Does a grant cover the whole installation?
Not necessarily. Ask for the full installed price, the confirmed grant deduction and your remaining contribution as separate figures. Additional work may sit outside the main installation price.
Air Source Heat Pump Cost is a consumer matching service. One online enquiry can bring up to four quotations from independent local specialists, depending on the work, coverage and availability. We do not carry out the work or employ the specialists. Companies joining the network are asked to provide relevant insurance details and references.
Describe your heat pump enquiry to request quotations without an obligation to accept.