Answer first
Home Energy Scotland currently uses £13,000 as an illustrative average air-to-water installation cost and £5,500 after a £7,500 grant. It warns that actual cost depends on unit size and work such as pipework, cylinder and radiator upgrades.
Ask for one written scope covering survey, design, equipment, heat distribution, electrical work, commissioning, certification, controls handover, warranties and VAT. Anything excluded should be visible before you compare installers.
Illustrative average air-to-water installation cost
View sourceIllustrative cost after the standard £7,500 grant
View sourceCurrent maximum combined grant-and-loan funding without rural uplift
View sourceGet one price for the complete system your home needs
Share the property, postcode, current heating and the cost question you want answered. FLO will explain what can be estimated now and what needs a survey before a figure is reliable.
Separate equipment from the installed system
The outdoor unit may be the most visible component, but the system also needs hydraulic parts, controls, valves, insulation, electrical protection and often a cylinder. Labour includes removal, pipework, flushing, filling, testing and commissioning.
A low equipment price says little about whether each room will be comfortable. The design work—heat loss, emitter selection, hydraulic layout and sound assessment—is part of the value.
Identify property-dependent work
Costs move with building heat loss, chosen output, access, pipe routes, radiator changes, cylinder space, electrical capacity, condensate disposal and the existing system. Scaffolding, lifting or builder’s work may also be necessary.
The survey should distinguish mandatory work from choices such as decorative radiator styles, relocation for aesthetics, smart controls beyond the core design or a larger optional solar-and-battery package.
Apply funding to an eligible scope
The current Scottish scheme can support the heat pump, related equipment, required cylinder, connections and necessary distribution upgrades, subject to approval and its terms. Funding must be arranged before work starts.
Quote comparisons should show the gross total, approved grant, optional loan and net amount separately. That prevents a grant from disguising a more expensive or incomplete scope.
Include ownership, not just day one
Record warranty length, required servicing, remote monitoring, call-out terms and expected replacement items. A cheap proposal with unclear aftercare can be poor value over the system life.
A property-specific quote should also include an estimated annual energy use with transparent tariff and seasonal-efficiency assumptions. Upfront cost and running cost belong in the same decision.
What to read next
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Questions people also ask
Why do heat-pump quotes vary so much?+
Homes need different capacities, emitters, cylinders, pipework, electrical changes and access arrangements; scopes also exclude different items.
Does the £13,000 figure apply to every home?+
No. Home Energy Scotland describes it as an illustrative average based on submitted invoices, including simple and extensive installations.
Should design and commissioning be itemised?+
They should at least be explicitly included in the scope, with the calculations and handover documents named.
Evidence used for this answer
Figures are explained in context and links go to the independent source. Prices, tariffs, scheme rules and standards can change, so check the source again before making a financial or technical decision.
- Home Energy Scotland: heat pumpsCurrent Scottish guidance on typical costs, savings, lifespan, comfort and combining a heat pump with solar panels.
- Home Energy Scotland Grant and Loan: terms and eligible costsCurrent Scottish grant and loan limits, eligible heat-pump costs, application conditions and rural uplift rules.
- MCS heat-pump design standardTechnical requirements for heat loss, equipment selection, domestic hot water and system design.
- MCS domestic heat-pump guideConsumer guidance covering design, installation, controls, handover and maintenance.