Mary Massey of Wilmslow, Cheshire, has done what the energy ministry apparently cannot: basic arithmetic on heat pump ownership costs. Four years into owning a heat pump, her annual service bill hit £345, of which £69 is pure VAT. The government will help you buy the unit, then tax you for keeping it running. This is a textbook policy incoherence. The Boiler Upgrade Scheme provides grants of up to £7,500 to nudge households toward heat pumps. But annual servicing — which is not optional if you want your warranty honoured and your system efficient — attracts the standard 20% VAT rate. The installation is subsidised; the maintenance is taxed. The signal to consumers is confused at best, punitive at worst. The running-cost argument is central to heat pump adoption. Proponents sell them as cheaper to operate than gas boilers over time. But when you stack a £345 annual service on top of electricity prices that remain substantially higher per kWh than gas, the payback period stretches. The £69 VAT is small in isolation but symbolic of a government that treats decarbonisation as a one-off purchase incentive rather than a lifecycle commitment. Massey wrote to the energy minister months ago and received no reply. This is the quiet part: letters from individual homeowners about maintenance VAT do not generate political urgency. There is no organised constituency lobbying for this fix. Heat pump installers — who stand to benefit from a healthier aftermarket — have not collectively pressured for the change either. The result is a policy gap that everyone can see and nobody owns. The fix is straightforward. VAT on heat pump servicing could be zero-rated or reduced to 5%, consistent with the treatment already applied to energy-saving materials installed in residential properties. Treasury would lose a trivial amount of revenue. The signal to the 250,000-odd UK households with heat pumps — and the millions more the government wants to convert — would be that the state backs the technology through its entire lifecycle, not just at the point of sale. Without this, the UK is building a fleet of subsidised assets whose owners face an annual tax penalty for maintaining them. Every year that passes without a fix adds another cycle of disillusionment to a technology already fighting perception problems around cost, noise, and performance in older housing stock. The economics of decarbonisation are won or lost in the boring details — servicing schedules, VAT codes, warranty terms — not in headline subsidy announcements.
