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James visits, gives a straight answer on suitability and a fixed estimate on the spot.
Are heat pumps worth it? Sometimes, and the answer depends on your property, your current system and what you actually want fixed. A page that opens with a flat “always” or “never” is selling you something. For an East Devon home on oil or LPG with an ageing boiler, the case is usually strong. For a well-insulated house on mains gas with a boiler that has years left in it, it often isn’t, not yet.
Key Takeaways
- Whether a heat pump is worth it turns on three things: your property, your current system and the electricity tariff you move to.
- In England and Wales, off-gas-grid oil and LPG homes can qualify for £9,000 on applications up to 31 March 2027; other eligible homes can qualify for £7,500.
- The electricity tariff you move to decides your running costs more than the heat pump itself does.
- A heat pump runs at a flow temperature of roughly 45 to 50°C, against a boiler’s 70°C or more, and owners notice the steadier background heat by the first winter.
- On mains gas, in a reasonably well insulated house with a young, efficient boiler, switching now may not stack up yet.
- Only a room-by-room heat loss survey settles it for your own property, and the free home assessment tells you first whether one is worth doing.
That split comes down to things you can check: what the house loses, what it burns now, and the electricity tariff you would move to. The sections below take each in turn, then the comfort difference lower-temperature heat makes and the cases where James would tell you plainly to wait. You won’t find an invented savings figure anywhere on this page.
When Are Heat Pumps Worth It? Volatility Protection, Not a Guaranteed Bill Cut
People asking whether heat pumps are worth it usually want one number back: a percentage off the bill, a payback period, a yes or a no. Any figure that ignores your house, your tariff and your habits would be a guess dressed up as a fact, so this guide shows where different homes tend to land instead.
Where different homes tend to land
Where your own house sits comes out of a home visit and, if you go further, a room-by-room survey.
For a home on oil, the honest case rarely starts with the bill. It starts with what stops: watching the gauge on the tank, ringing round for the best price per litre, and running dry on the coldest weekend of the year because the last fill got put off. A spreadsheet leaves that out, and anyone who has lived through a January delivery gap counts it straight away.
Against cheap heating oil on a standard electricity tariff, the running-cost gap can be slim, and we say so before anyone signs anything. The case gets stronger with the tariff you move to and the price volatility you leave behind. Our air source heat pump cost guide covers what the installation itself costs before the running-cost question comes into it.
Running Costs: Why the Tariff Decides More Than the Heat Pump Does
A heat pump runs on electricity, which costs more per unit than mains gas or heating oil. To come out ahead it has to turn each unit of electricity into several units of heat, which a correctly sized system does. Whether that beats what you pay now depends above all on the electricity tariff you are on.
Illustration: an old oil boiler and its foam-lagged copper cylinder, the kind of setup a heat pump replaces.
- Against a modern gas boiler The running-cost gap is often narrow.
- Against heating oil It can go either way, depending on the price that season.
- The rates Several of these tariffs charge less during heating hours.
- The running-cost picture It usually improves meaningfully.
Our guide to heat pump tariffs sets out the tariffs written for heat pump households.
Against oil, the comparison goes beyond pence per unit. Roughly 41,000 households across Devon heat with oil, and no price cap stands between an off-grid household and the number on the delivery invoice.
How the bills arrive
Illustration: the pattern, not the amountsOur guide to switching from oil to a heat pump sets out that comparison in full.
The Comfort Difference: Why Lower, Steadier Heat Feels Different
Illustration: the outdoor unit in the garden, pipes through the wall to the hot water cylinder, the wall controller and a radiator under the window.
The comfort case has nothing to do with the bill, and it holds on any tariff. A heat pump works best at a lower flow temperature, typically 45 to 50°C, against a gas or oil boiler’s 70°C or more. It runs for long, steady stretches at a gentle output instead of firing hard in short bursts, so the house sits at a more even temperature.
Flow temperature, turned down
None of that happens by itself. It depends on correct sizing, which is where the horror stories online come from. James audits other installers’ finished jobs as a freelance MCS assessor for NAPIT, and the fault behind most “it never gets warm enough” complaints is a unit and radiator set sized off a rule of thumb instead of a room-by-room calculation.
Cold weather on its own is no obstacle. Norway has some of the highest heat pump adoption rates in the world, through winters colder than East Devon ever sees.
The Grant and 0% VAT: What They Change, and What They Don’t
Illustration: four air-to-water heat pumps in different sizes and finishes, beside a hot water cylinder and a wall thermostat.
The Boiler Upgrade Scheme and the current VAT relief lower what the installation costs you upfront. They leave the running-cost question above exactly where it was, and plenty of grant-led advertising blurs the two together.
- £7,500 For people who own the property, in England or Wales, replacing fossil-fuel or direct-electric heating.
- £9,000 For off-gas-grid homes heating with oil or LPG, on applications made up to 31 March 2027.
- 0% VAT on qualifying installations, also running to 31 March 2027.
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Running costs Still set by your electricity tariff, your property’s heat loss and how you use the heating.
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Coming out ahead The grant gives no guarantee that your household pays less to run the house.
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Suitability A property that does not suit a heat pump stays unsuitable, grant or no grant.
Eligibility depends on the property and your circumstances, so James checks it rather than assuming it. Since April 2026 a valid EPC is no longer strictly required to apply, and other evidence can stand in where a property has no current one. Our guide to the £9,000 rate for off-grid oil and LPG homes sets out the full eligibility rules and the 31 March 2027 cut-off.
When the Answer Is No: Gas Homes, Young Boilers and the Wrong Expectations
An honest version of this guide has to cover where a heat pump is the wrong call, because overselling is exactly what this buyer has learned to distrust. Three cases come up.
Three times the answer is no
Being upfront about all three is the standard James applies when he audits someone else’s job as an MCS assessor: tell the truth, whether or not it closes a sale.
How We Answer “Is a Heat Pump Worth It” for Your Own House
Two visits get you from an open question to a real answer, and the route has an exit after the first one.
From the first visit to a running system
The process carries the same rigour for a strong-fit property as for one we would advise waiting on, because its job is a correct answer for your house. Full detail on the design and installation sits on our air source heat pump installation page.
Frequently Asked Questions
For the right property and expectations, yes, mainly through protection from oil and gas price volatility and steadier comfort. For a well-insulated mains gas home with a young boiler, often not yet. It depends on your property, your tariff and what you are trying to fix.
Book my free home assessmentNot guaranteed. Running costs depend heavily on the electricity tariff you move to, alongside your property’s heat loss and how you use the heating. We won’t quote a saving figure without knowing those three things.
Book my free home assessmentOften not straight away, particularly if the boiler is young and efficient and the property is well insulated. Gas is cheaper per unit than electricity on a standard tariff, so replacing a working boiler early rarely makes financial sense.
Book my free home assessmentNo. Cold-climate heat pump models are built to handle far lower temperatures than a Devon winter produces, and countries with genuinely cold climates have some of the highest heat pump adoption rates in the world. When owners report comfort problems, the usual cause is incorrect sizing.
Book my free home assessmentYes. A standard household tariff makes the running-cost case tighter, while a heat-pump-specific tariff with lower rates during heating hours usually improves it meaningfully. James talks through tariff options at the free home assessment.
Book my free home assessmentBook a free home assessment. James checks the property, the current system and grant eligibility, then gives a straight answer, including when the honest answer for your house right now is no.
Book my free home assessmentGet a Straight Answer, Not a Sales Pitch
Whether a heat pump is worth it comes down to your property, your current system and the tariff you are prepared to move to. At the free home assessment James walks the property, asks what heats it now and tells you straight, with a fixed estimate if it stacks up.
Book my free home assessmentPrefer to talk it through first? Ring 01395 202030. James answers, and he is the person who will price the job.
★★★★★
“We were very pleased with the installation of our 22 kW heat pump. Despite parts of the farmhouse being 13th century the system is performing extremely well and keeps the house constantly warm throughout.”
Barbara Murphy · Google review
