Why are heat pumps so unpopular?

Heat pumps are less common in the UK than across most of Europe, and the reasons are specific and fixable rather than mysterious. Around 85 per cent of UK homes are connected to the gas grid and only about 1 per cent run on a heat pump. France, Norway and the Netherlands install far more per household. The gap is real. It comes down to four things, and none of them is that the technology fails.

1. Running cost. UK electricity costs roughly four times as much per unit as gas, while a heat pump is only about three times more efficient than a boiler. Those two numbers nearly cancel, so a heat pump on the default tariff costs about the same to run as gas rather than dramatically less. This is the single biggest brake, and it is covered in Electricity costs four times what gas does below.

2. Upfront cost. A heat pump costs more to install than a replacement gas boiler, even after the £7,500 Boiler Upgrade Scheme grant. For a household with a working boiler and no immediate reason to change, that gap is enough to defer the decision for years.

3. Bad press. A wave of poorly designed early installs left a trail of unhappy stories, and a steady stream of negative newspaper coverage has kept them alive, some of it, as it turns out, deliberately seeded. The reputation has lagged well behind the actual state of the technology.

4. Gas incumbency. Most UK homes already have a gas boiler that works, sitting on a mature, cheap, familiar gas network. Replacing something that is not broken is a high bar, and awareness of the alternative is still low. The rest of this guide takes each of the four in turn, then looks at what is changing.

The biggest reason heat pumps have not swept the UK is the price of electricity. A heat pump is about three times more efficient than a gas boiler, so on efficiency alone it should win easily. It doesn't, because UK electricity costs roughly 4.3 times as much per unit as gas. Those two numbers nearly cancel, and the heat pump ends up costing about the same to run as the boiler it replaced.

The chart is the whole story in one picture. Nesta, the innovation foundation whose research shapes much of UK heat policy, puts the cost-parity point at an electricity-to-gas ratio of about 2.5, given a typical heat-pump efficiency of 3.0. Below that ratio a heat pump beats gas on running cost. Above it, gas wins. The UK sits at about 4.3, which is why the two end up roughly level today.

Most of Europe runs the identical machine on a very different ratio. Nesta notes France sits near 1.7, with Germany and most of the EU between 2 and 3. At those ratios a heat pump genuinely undercuts gas, which is a large part of why uptake has been faster there. The technology is the same. The unit prices are not. This is also why a heat pump saves the most for homes coming off oil or LPG, fuels that cost far more than mains gas, rather than for homes leaving a cheap mains-gas tariff. The running-costs guide works through the arithmetic and what it does to a year-one bill.

The important point for anyone deciding today is that this ratio is a policy choice, not a law of nature. It is propped up by social and environmental levies loaded onto electricity bills rather than gas, and by how much of the grid still runs on gas at the margin. Both are moving, which is the subject of What is actually starting to shift below.

The second brake is the install price. A replacement gas boiler is one of the cheapest big purchases a household makes, often £2,000 to £3,000 fitted. An air-source heat pump is a bigger job, typically £10,000 to £14,000 before the grant, because it can involve a hot-water cylinder, some larger radiators and a day or two more labour. Even after the £7,500 Boiler Upgrade Scheme grant takes a large bite out of that, the heat pump still costs more upfront than swapping like-for-like.

The National Audit Office, reviewing the government's heat-pump programme in March 2024, found that upfront installation costs had fallen more slowly than the government had hoped. That matters because the whole policy leans on the price coming down to close the gap with a new boiler. It is closing, helped by the grant and a maturing installer base, but it has not closed yet.

The fuller picture is that the upfront gap is real but often overstated in isolation. The grant is substantial, the running costs are at worst about level with gas and better on the right tariff, and a heat pump typically lasts as long as or longer than a boiler. For a household replacing a dying boiler anyway, or coming off expensive oil or LPG, the lifetime sums can already work. The cost-and-grants guide breaks the numbers down by property type and shows exactly how the £7,500 grant is paid.

The third reason is reputation, and it is the one most disconnected from the current state of the technology. If you have read that heat pumps leave people cold and broke, you have read something with two roots: a genuine wave of bad early installs, and a steady drumbeat of negative press, some of it deliberately placed.

The genuine part. A lot of UK heat pumps went in during the 2010s, before the trade had settled on good design practice and before installer training had caught up. Some were undersized, many were bolted onto radiators far too small to give out heat at a heat pump's lower flow temperature, and a number of households ended up cold, with high bills, and rightly angry. Those accounts are true, and they travel. The hardware and the design standards have both moved a long way since, but the memory of a neighbour's bad winter lingers.

The placed part. Alongside the real stories sits a run of newspaper headlines with a familiar shape, the noisy unit, the freezing house, the money pit. In 2024 the investigative outlet DeSmog reported that a number of these anti-heat-pump articles were seeded by a PR firm working for an organisation with an interest in keeping gas boilers selling. That does not mean every critical story is planted. It does mean the volume of negative coverage overstates the real failure rate, and it is worth knowing the incentive exists when you read the next scare headline.

The way to cut through both is to ignore the anecdote and look at the monitored data. The Energy Saving Trust's Electrification of Heat trial recorded a median seasonal efficiency of 2.80 across a broad mix of real UK homes, and the volunteer fleet on HeatpumpMonitor.org averages well above that on carefully commissioned installs. A modern, well-designed heat pump is a quiet, efficient, reliable machine. The gap between that and the headline is a gap between a good install and a bad one, which is covered in the cold-weather guide.

The fourth reason is the quietest and maybe the strongest. Around 85 per cent of UK homes are connected to the gas grid, and roughly three in four heat with mains gas. That network is mature, cheap to draw on, and woven into how the country has heated itself for half a century. Replacing a boiler that is sitting there working, with a more expensive machine, to save little or nothing on the monthly bill, is a hard case to make to a busy household.

On top of the incumbency sits an awareness gap. The National Audit Office found in 2024 that 30 per cent of people had never heard of, or knew hardly anything about, decarbonising home heating, and only 11 per cent felt they knew a lot. It also noted the department had no overarching plan to raise that awareness. You cannot choose a heat pump you have barely heard of, and most people make a heating decision only when the old boiler finally dies, under time pressure, when the familiar like-for-like swap is the path of least resistance.

This is less a flaw in heat pumps than a description of how heating decisions actually get made. It is also why the unrushed version of the question matters. The best time to find out whether a heat pump suits your home is before the boiler fails, not during the cold week it gives up.

"Unpopular" is a snapshot, not a trend line, and the trend is upward. UK heat-pump installations have risen most years, with 51,886 retrofit units recorded in 2025, a 7 per cent increase on 2024, and the country passed a cumulative 250,000 certified installations. The government wants 600,000 a year by 2028. That target counts new-build homes too, which it expects to be at least a third of the total, so the retrofit share works out at roughly 400,000. Even that is many times the current rate, so the climb is real but nowhere near done.

Installed, 2020–2025 If the recent pace continues Pace needed for the ~400,000 retrofit share

The price ratio is the one to watch. Because running cost is the biggest brake, the lever that matters most is the electricity-to-gas ratio. Nesta argues for capping it at 2.5, achieved by moving the social and environmental levies off electricity bills and onto general taxation or gas, and by a greener grid that needs gas-fired power less often. Removing the levies alone would shift the ratio down by roughly half a point. Every move down that scale tilts the running-cost sum further toward the heat pump.

The install base is maturing. The bad early installs came partly from too few trained installers learning on the job. The trade is larger and better trained than it was, design tools have improved, and high-temperature units that run on existing radiators have removed one of the classic reasons an older install struggled. The failure stories that built the reputation are getting rarer as the standard install gets better.

None of this makes a heat pump right for every home tomorrow. It does mean the four reasons above are softening rather than fixed, and the direction of travel is clear. For a growing share of UK homes, the running cost is already level or better, the upfront gap is bridgeable with the grant, and the technology does exactly what it says.

The honest version of "are they worth it" is that it depends on the home, and the four reasons above point straight at the answer. A heat pump makes the easiest sense today when several of these are true.

You are on an expensive fuel. If you heat with oil, LPG or direct electric rather than mains gas, the running-cost brake mostly disappears. A heat pump usually undercuts those fuels comfortably, and the case can be strong straight away.

Your home is reasonably insulated. A home that already holds its heat lets a heat pump run at a low flow temperature, which is where it is most efficient and cheapest. A draughty, solid-walled, loft-bare house usually needs some fabric work first to get the same result. The property-suitability guide covers what to check.

You can get on a heat-pump tariff. A specialist electricity tariff that prices off-peak power cheaply is what turns "about level with gas" into a clear saving. It is one of the biggest single levers on the bill.

And the other side: if you are on cheap mains gas, in a hard-to-heat home, with a boiler that still has years left, the case today is weaker, and waiting for fabric improvements or a better price ratio can be the right call. That is exactly the judgement HeatPass is built to make. The HeatPass check pulls your home's EPC record, asks the things it cannot answer, and gives you a straight verdict, including a Not Yet with a plan when that is the right answer. It takes about two minutes from your postcode. To understand the technology first, the heat-pumps-explained guide is the place to start.