Heat Pump Database
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heat pumps
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manufacturers
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ASHP
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WSHP / GSHP
New to heat pumps? Learn about COP, refrigerants, sizing, and UK grants on our What Is a Heat Pump? page.
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Select units from Browse, then review side-by-side here.
Explore the whole database visually. Hover or tap any point to see the product; click it to open full specifications. Use the filters to narrow the dataset across every chart.
Efficiency against heat output. Larger units sit to the right; higher points are more efficient. Note that COP is measured at differing test conditions — colour shows heat-pump type.
Seasonal efficiency against heat output — a more realistic year-round figure than a single COP test point. Note that SCOP is measured at differing test conditions — colour shows heat-pump type.
Heat pumps grouped by the hottest water they can deliver for heating, with bars coloured by type. Click any band to list the models in it and open full specs.
Retail price against heat output, using the average of the price range where a range is published. Only products with UK retail pricing data appear here.
Charts reflect the manufacturer-published figures held in this database. COP and SCOP are measured at different test conditions across products (shown in each product's detail view) — compare like-for-like where possible. Points with missing values are omitted from the relevant chart.
Browse by appearance. Many heat pumps look similar in a spec table but differ a lot on a wall or in a garden, so this view leads with the photo. Filter by the basics, then click any unit for its full specification.
Background reading and resources to help you make sense of the database. Learn the fundamentals in the FAQ, compare the refrigerants used in heat pumps, or browse our directory of useful external links.
A heat pump is an electric appliance that heats your home (and often your hot water) by moving heat that already exists outside (in the air, the ground, or a body of water) rather than burning fuel to create heat. It's the same technology as a fridge, just running in reverse.
A fridge pulls heat out of the cold inside of the box and dumps it into your warm kitchen, which is why the back of a fridge feels warm. A heat pump does exactly the same thing, but on a much bigger scale: it pulls heat out of the cold outdoors, however chilly, and pumps it into your warm home. It can do this even when it's close to freezing outside, because there is still usable heat energy in the air down to well below 0 °C.
A small amount of electricity runs a compressor, which is used to concentrate and move heat rather than generate it directly. That's why a heat pump can deliver several times more heat energy than the electrical energy it consumes: typically 3–4 units of heat for every 1 unit of electricity.
Behind that simple picture is a repeating loop: a cold refrigerant gas absorbs heat from outside (the evaporator), a compressor squeezes it to raise its temperature further, the hot gas gives up its heat to your home's water or air (the condenser), and an expansion valve drops the pressure so the cycle can start again. You don't need to understand this to use the database; it just explains why figures like COP and SCOP and flow temperature matter so much.
Browse air source, ground source and water source products in the database.
A gas boiler burns fuel on-site to generate heat directly; a heat pump uses electricity to move heat that's already there. That fundamental difference shows up across almost every point of comparison:
Figures are typical UK ranges for guidance only; actual performance depends on the specific product, installation and property. See our COP & SCOP guide for how efficiency is measured.
A gas boiler can never be more than 100% efficient: it can only release the energy locked in the gas it burns, and some is always lost. A heat pump isn't creating extra energy; it's moving free heat from outside, so the "output" can be several times the electricity "input". The diagram below shows roughly what happens to one unit of input energy in each case.
Heat pumps can heat pretty much any UK home, but a good result depends on getting a few things right beforehand. These are the main factors worth thinking through before you commit:
Of everything above, three factors matter most once you're comparing specific models:
Reviewed July 2026. This guide is general information, not professional or installation advice; always get a proper heat loss survey and installer quote for your specific property.
The refrigerant is the working fluid that lets a heat pump move heat from outside to inside. Which one a unit uses affects its environmental impact, its efficiency and achievable flow temperature, how it must be installed, and (increasingly) whether it can still be sold in the years ahead. This guide compares the refrigerants you will find across the database.
GWP (Global Warming Potential) measures how strongly one kilogram of the gas warms the planet over 100 years compared with one kilogram of CO₂, so CO₂ is 1, and a refrigerant with a GWP of 2,000 is 2,000 times worse if it leaks. The safety class (ASHRAE) flags flammability and toxicity: A1 non-flammable and low toxicity, A2L mildly flammable, A3 highly flammable, B2L mildly flammable but toxic.
GWP figures are 100-year values, rounded. They vary slightly between IPCC assessment reports (the EU moved from AR4 to AR5 values in 2025), but the relative picture is unchanged.
Natural refrigerants with negligible GWP. R290 has become the default for new residential air source heat pumps, while R600a appears in large industrial high-temperature machines.
A natural refrigerant that excels at producing very hot water and works well in cold weather. Common in commercial hot-water and high-temperature applications.
The workhorse of large industrial refrigeration, also used for big water-source and district-heating heat pumps.
Synthetic but ultra-low-GWP fluids, mostly used in large commercial and high-temperature centrifugal machines.
The fluorinated gases that dominated the last two decades. R32 is the current mainstream choice and far cleaner than the older R410A it replaced, but all are subject to the phase-down.
Engineered mixtures that cut GWP while staying close to the equipment design of the gases they replace: R454B/R452B for R410A, R513A/R515B for R134a.
Fluorinated refrigerants are controlled by F-Gas regulations, which shrink the supply of high-GWP gases over time and ban them in new equipment where cleaner alternatives exist. Natural refrigerants (R290, CO₂, ammonia) and HFOs largely sit outside these limits. The picture differs across the UK.
European Union: Regulation (EU) 2024/573 (also applies in Northern Ireland)
Thresholds and category definitions are simplified here; some categories have safety-related exemptions. Existing installed equipment is unaffected; the bans apply to new products placed on the market.
Great Britain (England, Scotland, Wales)
Great Britain did not adopt the EU's 2024 regulation. It keeps the retained Regulation (EU) 517/2014 (the earlier HFC quota phase-down plus existing rules such as the GWP ≥ 2,500 servicing ban), so the EU's new product bans above do not currently apply in GB. Defra reviewed the rules and launched a consultation on a tighter GB HFC phase-down in November 2025; in May 2026 it confirmed it would not change the phase-down steps for the 2027 period yet, with a fuller response due later in 2026. The direction of travel mirrors the EU: tighter HFC limits and a shift to low-GWP and natural refrigerants, but the precise GB timeline is still being decided.
Northern Ireland
Under the Windsor Framework, Northern Ireland continues to follow the EU F-Gas Regulation, so the EU timeline above applies there.
All of this sits under the global Kigali Amendment to the Montreal Protocol, which commits developed countries to cutting HFC use to a small fraction of historic levels over the coming decades.
The shrinking quota makes high-GWP gases such as R410A and R134a steadily scarcer and more expensive, pushing the whole market toward low-GWP and natural refrigerants. In practice:
Reviewed June 2026. Regulations change and the GB rules are under review; always confirm the current position before making decisions. This guide is general information, not regulatory or professional advice.
GWP in the table above is a multiplier, not a real-world quantity: on its own, "675" or "2,088" doesn't say much about actual climate impact. This calculator turns it into a concrete figure: enter the refrigerant charge (the amount of gas sealed inside a heat pump's circuit, usually stated on its data plate or datasheet) and it converts that into the CO₂e it represents. Because a sealed system doesn't lose its whole charge at once, the calculator also shows how that impact builds up gradually over time through ordinary annual leakage, rather than assuming a one-off release.
Illustrative estimate only. GWP values are the 100-year AR5 figures from the table above (charge in kg × GWP = kg CO₂e). Annual leak rate is user-adjustable; the 4% default follows CIBSE TM65: Embodied Carbon in Building Services — A Methodology, which gives typical annual refrigerant leakage rates of roughly 2% for factory-sealed monobloc units with no on-site refrigerant work, 4% for systems with some on-site pipework, and 6% for VRF systems with large on-site-filled charges; well-installed heat pumps can leak far less, and any leak of this size should be found and repaired by a qualified installer, not budgeted for. This tool is not a substitute for a proper F-Gas leak check or emissions audit.
COP and SCOP both describe how efficiently a heat pump turns electricity into heat, but they answer different questions, and neither figure means anything without the conditions it was measured at. This guide explains what each one is, how to read the test conditions shown throughout this database, and how to compare models fairly.
COP (Coefficient of Performance) is the heat delivered divided by the electricity consumed at one specific operating point. A COP of 4 means the unit produces 4 kW of heat for every 1 kW of electricity it draws: in other words, 400% efficient. It is an instantaneous snapshot, taken with the source and output temperatures held fixed.
A COP only has meaning alongside the two temperatures it was measured at, written as source/output. For an air source heat pump, A7/W35 means 7°C outdoor air going in and 35°C water leaving to the heating system. Change either temperature and the COP changes, often dramatically. The same machine might post a COP of 5.0 at A7/W35 and 2.7 at A7/W55; both are true. The refrigerant a unit uses also affects how efficiency behaves across conditions.
Two levers move the number: a colder source lowers COP (the unit has to work harder to gather heat), and a higher flow temperature lowers it (it has to lift the heat further). The figures below are illustrative ranges for a typical modern air source unit, not a specification; they show the shape of the effect.
The flow-temperature effect is the one you have most control over once a system is installed. See the Flow temperature & efficiency guide.
SCOP (Seasonal Coefficient of Performance) averages efficiency across a whole heating season. The EN 14825 standard, often used by manufacturers, sets very specific test procedures for estimating SCOP. Rather than a single operating point, it weights many points across a full year of outdoor temperatures and part-load conditions for a reference climate. That makes it a far better predictor of real annual running cost than any single COP.
SCOP carries conditions too. The two that matter are the application flow temperature and the climate. A complete figure therefore reads something like "SCOP 4.6 (W35, average climate)". The familiar ErP energy label (A+++ to G) is derived directly from SCOP.
Because SCOP is a calculation across a season rather than a single measurement, EN 14825 fixes a detailed set of assumptions so every manufacturer's figure is built the same way. Knowing them explains both how the number is reached and why a lab SCOP won't exactly match your own bills.
A reference climate, not your weather. Efficiency is weighted across a standard heating season for one of three defined climates. The Average profile is mandatory and is the one behind the ErP energy label; Warmer and Colder are optional. Each sets a reference outdoor design temperature (the coldest design point) and a total number of heating hours.
Within the chosen climate, the rest of the framework is:
What it deliberately leaves out is your building. EN 14825 assumes a standardised climate and load, not your home's heat loss, controls or installation quality. A figure measured in a real installation is called the Seasonal Performance Factor (SPF), and it can sit either side of the rated SCOP.
COP is a snapshot at one condition; SCOP looks at the whole year. To judge how a unit will perform (and cost to run) over a year, SCOP at the flow temperature you intend to use is the more useful number. COP is best for understanding behaviour at a particular point, such as a cold snap (A-7/W35) or heating domestic hot water at a high flow temperature.
Reviewed June 2026. This guide is general information to help interpret the data, not professional or design advice; always confirm performance figures against the manufacturer's datasheet.
Flow temperature (how hot the water is that a heat pump sends to your radiators or underfloor heating) is the single biggest factor you control that affects efficiency. This guide explains why lower is better, the trade-off with your heat emitters, and how to read the flow-temperature data in this database.
The flow temperature (or leaving water temperature) is how hot the heat pump heats the water it sends out to the heating system. It is the "W" number in a rating such as A7/W35, where 35 is a 35°C flow. The water gives up its heat to the rooms and returns cooler: the return temperature.
A heat pump's efficiency is governed by the "lift": the gap between the source temperature and the flow temperature. The smaller that gap, the less work the compressor does, and the higher the COP and SCOP. This is fundamental thermodynamics, not a quirk of any one model.
As a rule of thumb, every 1°C you can shave off the flow temperature improves efficiency by roughly 2–2.5%. Dropping from a boiler-style 55°C to 35°C can lift seasonal efficiency substantially, often taking a SCOP from around 3 to comfortably above 4. The numbers below are indicative, to show the shape of the relationship.
The catch is that a lower flow temperature means each radiator gives out less heat, so you need more emitting surface to warm the room. Underfloor heating is ideal, a huge surface area running happily at 30–40°C. Existing radiators sized for a 70–80°C gas boiler are often undersized for 35–45°C operation and may need upsizing. Matching emitters to a low flow temperature is the central design task of a heat pump installation, and the main reason a proper heat-loss survey matters.
Modern heat pumps use weather compensation: they raise the flow temperature only as the weather gets colder, and keep it as low as possible the rest of the time. Leaving this enabled, rather than fixing a high flow temperature year-round, is one of the easiest ways to protect efficiency, and it is how the low seasonal figures are actually achieved in practice.
Domestic hot water has to be stored hotter, typically around 50–60°C, partly to manage legionella, so the heat pump briefly runs at a high flow temperature to reheat the cylinder, at lower efficiency. That is normal and unavoidable; what matters is that space heating stays at a low flow temperature the rest of the time. High-temperature R290 units can reach the hot-water temperatures directly without an electric backup heater.
Every model has a maximum flow temperature (shown here as the upper end of its flow range). High-temperature heat pumps (usually running R290 (propane)) reach 70–75°C, which lets them replace a boiler on existing radiators with little or no upgrading. That is genuinely useful for difficult retrofits, but running permanently hot sacrifices efficiency. Treat a high ceiling as headroom for the coldest days, not an everyday target.
Reviewed June 2026. This guide is general information, not professional or design advice; a heat-loss survey by a qualified installer is the basis for any real system design.
An air source heat pump installation is a package of several separate costs, not just the price of the outdoor unit. This guide breaks the total down into its parts: the heat pump itself, the hot water cylinder, controls, and radiator upgrades, using typical figures reported by UK installer cost guides, so you know roughly what to expect before getting quotes.
These are supply-and-install totals for a straightforward air-to-water ASHP replacing a fossil-fuel boiler, before and after the current £7,500 Boiler Upgrade Scheme (BUS) grant in England and Wales. Actual costs depend heavily on your property's insulation, existing pipework, and how many radiators need upgrading; treat these as a starting point, not a quote.
Figures are indicative UK averages compiled from installer cost guides (Checkatrade, The Eco Experts, MyJobQuote), current as of 2026. Individual quotes commonly range £7,000–£16,000 depending on the factors below; always get several quotes from MCS-certified installers.
A quote is really several line items bundled together. Here is roughly what each one costs on its own.
The outdoor unit (and, for split systems, the indoor hydraulic box) is priced mainly by capacity. Larger, higher-output, or high-temperature/R290 models sit at the top of each band.
Fitting the unit, connecting pipework, commissioning and the heat-loss survey typically adds £3,000–£7,000: around £3,000–£4,500 for a standard swap onto existing pipework, rising to £4,500–£7,000 where significant pipework changes are needed.
Most ASHP installs need a new (or first-time) unvented hot water cylinder, since heat pumps heat water more gradually than a combi boiler. A heat-pump-ready cylinder (with a larger heat-exchanger coil to transfer heat efficiently at a lower flow temperature) supplied and fitted typically costs £900–£2,000, depending on size (commonly 150–300 litres for a household) and coil specification. It must be fitted by a G3-registered installer and serviced annually.
A basic room thermostat and outdoor sensor for weather compensation is usually bundled with the unit. Extra controls (additional zone thermostats, smart thermostatic radiator valves, or a multi-zone control setup) typically add £300–£1,200 depending on how many zones and rooms are covered.
Because a heat pump runs at a lower flow temperature than a gas boiler, each radiator gives out less heat for the same size, so some radiators sized for a 70–80°C boiler need replacing with larger ones to keep rooms warm at 35–45°C. Installers typically charge £300–£500 per radiator supplied and fitted: for example, upgrading 10 radiators is commonly quoted around £3,000 in total. Not every radiator needs replacing; a heat-loss survey identifies which ones are undersized for low-temperature operation.
Many properties need a consumer unit upgrade or a new dedicated circuit to the outdoor unit, typically £500–£800. Whether this is needed depends on your existing electrics and the unit's power draw; your installer will confirm this during the survey.
Ongoing running costs are separate from installation: budget roughly £150–£300 for an annual service. Figures above are indicative UK 2026 averages from Checkatrade, The Eco Experts and similar installer cost guides, not fixed prices; always get itemised quotes from at least three installers.
The government's Boiler Upgrade Scheme currently provides £7,500 towards an air source or ground source heat pump in England and Wales (£2,500 for air-to-air, £5,000 for biomass boilers). It is applied as an upfront discount by your MCS-certified installer: you do not pay the full amount and claim it back.
Reviewed July 2026. Costs are general UK guide prices, not quotes, and change over time; always confirm current grant eligibility and get itemised quotes from MCS-certified installers before budgeting. This guide is general information, not financial or professional advice.
There isn't one single UK heat pump grant: there are several, and which ones apply to you depends on where you live, your income, and what you're replacing. This guide covers every current route: the Boiler Upgrade Scheme, 0% VAT, Home Energy Scotland, Warm Homes: Local Grant, ECO4, and support in Northern Ireland: what each gives you, who qualifies, and how to apply.
Answer two questions and we'll point you to the schemes worth applying for, in order.
A quick pointer, not a formal eligibility check; confirm details with the scheme directly before applying.
You often can't combine two capital grants for the same measure, but 0% VAT applies alongside any of the others. Always confirm combinability with your installer or scheme adviser before applying.
The government's main heat pump grant, open to any homeowner regardless of income. Paid as an upfront discount off your installer's quote, not claimed back after the fact.
Plus an extra £1,500 (£9,000 total) for ASHP/GSHP on oil or LPG properties with no mains gas connection, between 21 July 2026 and 31 March 2027. One grant per property; hybrid systems don't qualify.
Funded through to 31 March 2030, with £400 million budgeted for 2026–27. Full detail: eligibility edge cases (self-build, new build), what doesn't qualify (social housing, previously-funded properties), and biomass-specific rules, are in our installation costs guide and the official GOV.UK guidance.
Separate from any grant, and stackable with one: installing a qualifying heat pump in a UK home currently attracts 0% VAT instead of the usual 20%, covering both the equipment and installation labour.
Scotland's equivalent to the Boiler Upgrade Scheme, run by Home Energy Scotland on behalf of the Scottish Government: a grant that can be topped up with an optional interest-free loan.
Funding is allocated first-come, first-served and subject to availability, so apply early in the financial year. Full detail: Home Energy Scotland official guidance.
A fully-funded scheme for lower-income households in England, delivered through local councils. It's a whole-home energy efficiency programme rather than a heat-pump-specific grant; a heat pump is only installed where a survey finds it suitable.
Runs April 2025 to March 2028. Equivalent support in Wales is arranged through the Welsh Government's Warm Homes Programme, and in Scotland through Home Energy Scotland (above).
The Energy Company Obligation is funded by energy suppliers rather than general taxation: they're required to fund efficiency upgrades, including heat pumps, for low-income and vulnerable households as part of a "whole-house" retrofit.
Currently running to 31 December 2026. More tightly targeted than BUS, but can cover a much larger share (or all) of the cost for those who qualify.
Northern Ireland isn't covered by the Boiler Upgrade Scheme, and its own Boiler Replacement Scheme has closed with no direct £7,500-style heat pump grant currently in its place. Support is more limited for now:
Reviewed August 2026 against GOV.UK, Home Energy Scotland and nidirect guidance. This is general information, not financial or professional advice; funding rules, amounts and deadlines change and vary by circumstance, so always confirm current eligibility with the relevant scheme, your council, or an MCS-certified installer before budgeting or buying.
Most residential heat pumps in the UK can be installed without a planning application, under what's called permitted development. But the exact size, siting and noise conditions differ by nation, and enough properties fall outside them, flats, listed buildings, conservation areas, tight boundaries, that it's worth checking before you commit to a quote. This guide covers the rules, process and costs for England, Wales, Scotland and Northern Ireland.
Since 1 December 2011, installing an air source heat pump on a house or block of flats has normally been permitted development, provided all of the following are met.
The old rule requiring 1 metre of clearance from a neighbouring boundary was removed in May 2025: siting is now governed purely by the MCS 020a noise calculation, not a fixed distance. Ground source and water source heat pumps are usually permitted development too; see below for when an environmental permit is also needed. Full detail: Planning Portal: air source heat pumps.
Wales updated its permitted development rules from 1 June 2026, bringing them much closer to England's. Before that date the older, stricter rules (one unit, 1m³ limit, 3 metre boundary clearance) applied, so if you're reading older advice, check the date.
Listed buildings and conservation areas are handled separately by your council, as in England. Source: MCS: PDR changes in Wales from 1 June 2026.
Scotland runs a separate planning system with its own permitted development classes: Class 6H covers air source heat pumps, Classes 6D and 6E cover ground and water source. Scotland hasn't adopted England and Wales's two-unit allowance for detached houses.
Ground and water source heat pumps (Classes 6D/6E) are permitted development within the curtilage of a dwelling or flat building with no additional size or siting limits beyond that. Source: gov.scot: Planning circular 1/2024.
Since a July 2023 amendment, air source heat pumps are generally permitted development in Northern Ireland too, but the conditions sit closer to England and Wales's older, stricter rules than their current position.
Northern Ireland's rules have changed less publicly than the rest of the UK's recently, so always confirm the current conditions with your council or nidirect's planning guidance before installing.
Planning permission is only half the picture for ground and water source systems. Because they exchange heat with groundwater or a watercourse, they're also regulated environmentally, separately from planning. In England, closed-loop systems installed after 1 October 2023 are usually covered by the Environment Agency's regulatory position statement for single residential systems, while open-loop systems generally need a registered exemption or a full permit. The equivalent regulator handles this in the other nations: Natural Resources Wales, the Scottish Environment Protection Agency (SEPA), or NIEA in Northern Ireland. Check with your installer and the relevant regulator before finalising a ground or water source design; this is on top of, not instead of, the planning steps above.
Because most installations qualify as permitted development, most homeowners never pay a planning fee at all, this is separate from the cost of the heat pump itself (see our installation costs guide). Where a full householder application is needed, indicative 2026 fees for alterations to a single dwelling are:
Figures are the standard fee for a householder application to alter or extend a single dwelling, the closest published category to a heat pump application, and change periodically. On top of the fee, budget for pre-application advice if you use it, and for an independent acoustic assessment if your installer's MCS 020(a) calculation alone isn't accepted by your council. Always confirm the current fee with your local planning authority before applying.
Reviewed August 2026 against Planning Portal, gov.wales, gov.scot and MCS guidance. Planning rules, fees and noise standards change and can also vary by local authority; this is general information, not professional planning advice, so always confirm current requirements with your council or a qualified installer before starting work.
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