How Does the Heater Work in an Electric Car? Heat Pumps Explained
An electric car heats its cabin with power from the drive battery, either through a resistive heater or a more efficient heat pump that moves heat in from outside and from the car's own motors.
Quick answers
- An electric car has little engine waste heat to borrow, so it warms the cabin with electricity from the drive battery, using a resistive heater, a heat pump, or both.
- A heat pump works like a fridge in reverse: a refrigerant absorbs heat from outside air and from the motors, inverters and battery, and a compressor concentrates it to warm the cabin.
- In What Car?'s winter test, published in December 2024, a Volkswagen ID.7 with a heat pump fell 29.6% short of its official range, against 33.6% for the same model without one.
- What Car? measured the heat pump lifting the ID.7's efficiency from 3.3 to 3.5 miles per kWh, worth 14 miles in its test, for a £1,050 option.
- Land Rover says the Range Rover Electric's ThermAssist system cuts heating energy by 40% and adds up to 25 miles of range, which EV Compared works out as about 8 kWh, or 52p at a 6.5p off-peak home rate.
- Auto Express names the Renault Scenic, Renault Megane, Nissan Ariya and BMW i4 as having a heat pump across the range, and Electrifying.com says a heat pump cannot be retrofitted.
An electric car heats its cabin with electricity from the drive battery, either through a resistive heater that turns current straight into heat or through a heat pump that moves heat in from the outside air and from the car’s own motors and electronics. A heat pump gets more warmth from each unit of battery energy, so cars fitted with one lose less range on a cold British morning.
A petrol or diesel car heats its cabin almost for free: Electrifying.com notes that the average combustion engine turns less than half the energy in its fuel into power, and the heater borrows some of the waste heat from the coolant. An electric motor gives off far less spare heat, so an electric vehicle pays for its warmth from the battery. That is why heating matters more in an EV, and why heat pumps exist.
How does the heater work in an electric car?
An electric car’s heater runs on power from the high-voltage battery, the same one that drives the wheels. There are two ways of turning that power into a warm cabin, and many cars carry both.
The simpler one is a resistive heater, often called a PTC heater. Current passes through a heating element, the element gets hot, and a fan blows air across it into the cabin. It is quick, compact and works at any temperature. Its weakness is that it can never give out more heat than the electricity it consumes, so every unit of warmth is taken directly from your range.
The second is a heat pump, which Electrifying.com describes as producing more energy in the form of heat than it consumes as electricity. It does that by moving heat that already exists rather than making it. The car’s climate control system decides which to use, and in cold weather it may run both.
What does a heat pump do in an electric car?
A heat pump collects low-grade heat from the outside air and from the car’s hardware, then concentrates it to warm the cabin. Kia describes it as extracting heat from the outside air even when temperatures are low, and working in reverse in summer to remove warm air from the cabin, so the same kit doubles as the air conditioning.
Hyundai’s explanation of its own system sets out the cycle:
- Heat from the outside air and from the car’s components turns a refrigerant from liquid into gas.
- A compressor squeezes that gas, raising its pressure and its temperature.
- In a condenser, the hot gas turns back into a liquid and releases its heat, which is blown into the cabin.
- The refrigerant goes round again.
The extra trick in a car is waste heat. Hyundai says its system recovers heat from the drive motors, onboard chargers and inverters, and from the battery pack and slow charger. Kia says the EV9 collects waste heat from its electric motors and power electronics. The refrigerant loop is managed alongside the battery’s coolant, so a heat pump is part of the same thermal system that, as our guide to the battery management system explains, keeps cells at a healthy temperature.
The idea is not new: Hyundai says the first-generation Kia Soul EV introduced a heat pump in 2014.
Does the heater in an electric car drain the battery?
Yes, heating the cabin uses battery energy and reduces range, and a heat pump reduces that loss rather than removing it. One UK test comes from What Car?, which in a winter test published in December 2024 ran two Volkswagen ID.7 Pro Match cars side by side, one with a heat pump and one without, at 10 to 11C with the climate control set to 21C.
| Test | Car | Heat pump | Result |
|---|---|---|---|
| What Car?, UK, published December 2024, 10 to 11C | Volkswagen ID.7 Pro Match | Yes | 268 miles, 29.6% short of 381 miles official |
| What Car?, UK, published December 2024, 10 to 11C | Volkswagen ID.7 Pro Match | No | 254 miles, 33.6% short of 383 miles official |
| What Car?, efficiency in the same test | Volkswagen ID.7 Pro Match | Yes vs no | 3.5 vs 3.3 miles per kWh, a 5.2% gain |
| Korean Ministry of Environment, minus 7C, reported by Hyundai | Hyundai Kona Electric, Kia Niro EV | Yes | About 90% of range kept, compared with 26C |
| Same test, reported by Hyundai | Rival EVs | Not stated | 18 to 43% of range lost |
What Car? found the heat pump added 14 miles, though it noted the heat pump car also had a panoramic glass roof, so the two were not identical. Auto Express puts the general gain at about 10% more range. Heating is only one part of the winter loss: a cold battery is also less efficient, which our guide to how much range you lose in winter covers in full.
What does heating cost in a Range Rover Electric?
Land Rover says ThermAssist, the Range Rover Electric’s thermal management system, cuts heating energy consumption by 40% and adds up to 25 miles of range. To put a price on those 25 miles, EV Compared converts them to energy using the car’s efficiency.
Method: efficiency is WLTP miles divided by usable kWh, and energy is priced at 6.5p per kWh (Intelligent Octopus Go), the 26.32p price cap rate (1 October to 31 December 2026) and 82p per kWh for public rapid charging (Zapmap price index, October 2026), ignoring charging losses; see our methodology.
The Range Rover Electric EV550 Autobiography SWB costs £154,070 in November 2026, with a 118.5 kWh usable battery and a WLTP range of 372 miles. That is 3.14 miles per kWh, so:
- A full charge costs £7.70 at home on 6.5p, £31.19 at the price cap and £97.17 on a rapid charger.
- Driving costs 2.1p per mile at home, 8.4p at the price cap and 26.1p on a rapid charger.
- Land Rover’s 25 miles from ThermAssist is about 8 kWh, worth 52p at the off-peak home rate, £2.10 at the price cap and £6.53 on a rapid charger.
The lesson applies to any EV: if you charge at home overnight, the energy a heat pump saves is worth pennies, while on the public rapid network the same energy costs more than twelve times as much. A heat pump’s value is less about money at home and more about miles between stops.
Do electric car heaters work immediately?
Yes, an electric car’s heater starts warming the cabin as soon as the car is switched on, with no wait for an engine to reach temperature. A resistive heater reaches full output quickly.
Better still is pre-conditioning: warming the cabin, and on many cars the battery, before you set off, using the car’s app or a departure timer. Done while the car is plugged in, the energy comes from the wallbox rather than the battery, so you leave with a warm car, a clear windscreen and your full charge. If you are still choosing a wallbox, Best Chargers compares home chargers.
A warm battery also accepts rapid charging faster, which our explainer on why an EV charges slower in cold weather sets out. Heated seats and a heated steering wheel warm you directly rather than heating all the air in the cabin, so using them with a lower cabin temperature saves energy whichever heater your car has.
What is the downside of heat pumps?
The main downsides are cost, complexity and reduced effect in deep cold. Where a heat pump is an option it costs real money: What Car? priced it at £1,050 on the ID.7, and Electrifying.com points out that it cannot be retrofitted, so the decision is made when you order.
A heat pump also depends on finding heat to move, and the colder the outside air, the less there is to collect. Electrifying.com reports that Land Rover’s ThermAssist recovers heat in temperatures as low as minus 10C, and Land Rover tested the Range Rover Electric at minus 40C in Arjeplog, Sweden.
Which electric cars have a heat pump as standard in the UK?
Several mainstream models fit a heat pump on every version, while others make it an option or keep it for higher trims. Auto Express names the Renault Scenic E-Tech, Renault Megane E-Tech, Nissan Ariya and BMW i4 as having a heat pump across the range, and the Volkswagen ID.3 and Skoda Enyaq as offering one only as an option or on pricier trims.
Electrifying.com lists Tesla models, the Hyundai Ioniq 5 and the Kia EV6 among cars with heat pumps. Kia says heat pumps come on selected derivatives of the EV3, EV6 and EV9, so check the specification of the exact version you are pricing rather than the model name.
Are EV heat pumps worth it in the UK?
A heat pump is worth having if you drive long distances in winter or rely on public charging, and it is a weak buy on cost grounds alone if you mostly do short trips and charge at home. What Car? worked out that at 79p per kWh, the ID.7’s £1,050 heat pump would take about 85,000 miles to pay for itself in electricity, and longer on home charging.
That sum misses what a heat pump is for. Fourteen extra miles in What Car?’s test, or Auto Express’s estimate of about 10%, can be the difference between reaching home and stopping to charge on a January evening.
What it means for choosing a car
Treat the heat pump as a range feature, not a running cost feature. If you regularly make long motorway trips in winter, have no driveway, or live somewhere colder than average, favour a car with a heat pump fitted, or pay for the option. Our list of the best electric cars for range in cold weather is a good starting point.
If your driving is mostly local and you charge overnight at home, a car without one will serve you well, provided you pre-condition while plugged in and use the heated seats. For that driver, a larger battery or better efficiency does more for winter range than the heater. Our EV jargon buster explains spec sheet terms such as PTC heater, pre-conditioning and thermal management.
Our verdict, based on published test data rather than our own driving: a heat pump is a worthwhile feature that trims winter range loss by a few percentage points, and it matters most to drivers who use rapid chargers or cover long winter journeys. It does not stop an electric car losing range in the cold, and it is not a reason on its own to choose one car over another with a bigger battery.
How we test and where our numbers come from
Range figures are official WLTP combined values taken from manufacturer UK specification pages, with real-world estimates drawn from independent comparative testing. Prices are UK list prices at the time of the latest update. Tax, grant and charging-scheme figures come from GOV.UK and HMRC publications. We re-check every guide when pricing, specification or policy changes. Last checked 10 November 2026. How we work out our own figures.
Frequently asked questions
Does the heater in an electric car drain the battery?
Yes, the heater runs on the same battery that drives the wheels, so heating the cabin reduces range. How much depends on the heater: in What Car?'s winter test, published in December 2024, a Volkswagen ID.7 with a heat pump fell 29.6% short of its official range, against 33.6% without one, with the climate control set to 21C.
What does a heat pump do in an electric car?
A heat pump moves heat rather than making it. A refrigerant absorbs heat from the outside air and from the motors, inverters and battery, a compressor raises its temperature, and a condenser releases that heat into the cabin. Run in reverse, the same system cools the cabin in summer, so it doubles as the air conditioning.
Do electric car heaters work immediately?
Yes, an electric car's heater does not have to wait for an engine to warm up, because it runs on battery power from the moment the car is switched on. Most electric cars can also warm the cabin before you leave, from an app or a timer, and doing it while plugged in at home draws the energy from the mains rather than the battery.
Are EV heat pumps worth it in the UK?
A heat pump is worth having for drivers who cover high winter mileage or rely on public rapid chargers, because the range it saves matters most on long cold trips. On electricity savings alone, What Car? calculated that a £1,050 heat pump option on an ID.7 would take about 85,000 miles to pay for itself at 79p per kWh.
What is the downside of heat pumps in electric cars?
The downsides are cost and complexity: a heat pump is often an option, which What Car? priced at £1,050 on a Volkswagen ID.7, and it cannot be added after the car is built. It also has less heat to collect as the outside air gets colder; Electrifying.com reports that Land Rover's ThermAssist system works in temperatures as low as minus 10C.
Which electric cars have a heat pump as standard in the UK?
Auto Express names the Renault Scenic, Renault Megane, Nissan Ariya and BMW i4 as having a heat pump fitted across the range. Electrifying.com lists Tesla models, the Hyundai Ioniq 5 and the Kia EV6 among cars with heat pumps, and Kia says its pumps come on selected versions of the EV3, EV6 and EV9.
Sources and further reading
- whatcar.comRange test: How far can electric cars go in winter?Winter test published December 2024, at 10 to 11C with climate control at 21C: Volkswagen ID.7 with heat pump 29.6% short of official range, without 33.6%; efficiency 3.3 to 3.5 miles per kWh, a 5.2% gain, 14 extra miles; £1,050 option; about 85,000 miles to recoup at 79p per kWh.
- hyundai.comRecycling More Heat: Hyundai and Kia Turn Up EV Efficiency with New Heat Pump TechnologyHow the refrigerant cycle works; waste heat recovered from motors, onboard chargers, inverters, battery pack and slow charger; first fitted to the Kia Soul EV in 2014; 90% range kept at minus 7C in a Korean Ministry of Environment test, against losses of 18 to 43% for rival EVs.
- kia.comWhat Is a Heat Pump and How Do They Work?Heat pump extracts heat from outside air and works in reverse to cool; EV9 uses waste heat from motors and power electronics; heat pumps on selected versions of the EV3, EV6 and EV9.
- autoexpress.co.ukWhat are heat pumps in electric cars? Range-boosting feature explainedAbout 10% more range with a heat pump (26 February 2026); heat pump across the range on the Renault Scenic, Renault Megane, Nissan Ariya and BMW i4; optional or higher trims only on the Volkswagen ID.3 and Skoda Enyaq.
- electrifying.comHeat pumps in electric cars explainedHeat pumps produce more heat than the electricity they consume; a combustion engine turns less than half its fuel energy into power; Teslas, Hyundai Ioniq 5, Kia EV6 and BMW i4 have heat pumps; a heat pump cannot be retrofitted.
- jlr.comRange Rover Electric: a new era for the original luxury SUVThermAssist adds up to 25 miles of range and cuts heating energy use by 40%; tested at minus 40C in Arjeplog, Sweden; 118.5 kWh battery, 372 miles WLTP; from £154,070 OTR, orders open 2 September 2026.
- rangerover.comRange Rover ElectricThermAssist gives a 40% reduction in heating energy consumption to help maintain range and charging consistency.
- electrifying.comRange Rover keeps cool with new info about all-electric modelThermAssist recovers heat to warm the cabin or propulsion system in temperatures as low as minus 10C (25 April 2025).
EV Compared
The EV Compared editorial team tracks the UK electric vehicle market full time: new model launches, list prices, WLTP and real-world range, public charging tariffs and the tax rules that decide what an EV actually costs to run. Every guide is checked against manufacturer specifications and official GOV.UK figures, and updated whenever the numbers move.
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