David Reynolds of Diss, Norfolk, has run a ground-source heat pump for 18 years. It has never received an annual service. His installer told him a check every few years — ground loop fluid density, general lookover — is sufficient for a device that is fundamentally electrical, not combustion-based. His service, when it happens, costs about £170. This directly contradicts a previous letter from Mary Massey, who claimed her heat pump requires an annual service costing roughly £350. The gap between these two accounts is not trivial — it speaks to a persistent information asymmetry in the UK heat pump market. Installers and servicing companies have a financial incentive to recommend annual maintenance schedules modelled on gas boilers, even when the technology doesn't require it. Reynolds's analogy is structurally precise: a heat pump is a refrigerator running in reverse. Both are sealed-loop electrical systems with a compressor. Nobody schedules an annual fridge service. The absence of a burner eliminates the two primary reasons gas boilers need annual attention — combustion-component degradation and fire-safety inspection. Remove the flame, remove the maintenance regime. The efficiency numbers are well-established. Heat pumps deliver roughly 3-5 units of heat for every unit of electricity consumed, versus a gas boiler's theoretical maximum of roughly 0.9 units of heat per unit of gas. Reynolds cites "four or five times the efficiency rates of boilers that use burners," which aligns with the coefficient of performance (COP) range for well-installed ground-source systems. The real extraction here is informational. Households considering heat pumps are being told — by incumbent gas servicing companies, by anecdote, by letters like Massey's — that the maintenance burden is comparable to a boiler. It isn't. The running-cost comparison between £350/year and £170/every-few-years compounds dramatically over the 20-year lifespan of a heat pump installation. A household paying £350 annually for unnecessary servicing would spend roughly £7,000 over two decades on maintenance that may not be required. This is a micro-story with a macro pattern: incumbent industries (gas boilers, gas servicing networks) have strong incentives to frame replacement technologies as equally burdensome. The framing persists because most consumers lack an 18-year operating track record to draw on. Reynolds has one, and the data is unambiguous. The policy implication is straightforward. If the UK government is serious about heat pump adoption — and the target is 600,000 installations per year by 2028 — it should publish clear, official guidance on maintenance requirements that distinguishes heat pumps from boilers. Letting the servicing industry self-regulate the maintenance narrative is a gift to incumbents.
