Best heat pump for a bungalow: what single-storey homes actually need

Quick answer: For most two and three bed bungalows the Vaillant aroTHERM plus 7kW is the one to beat. It has an MCS-listed SCOP of 4.36 at 35°C flow, Quiet Mark accreditation and a guarantee extendable to 7 years. Price the Grant Aerona 290 6.5kW against it, and expect roughly £7,200 to £17,100 installed before the £7,500 grant.

Why bungalows are a special case

Picture a 100m² bungalow next to a 100m² two-storey house. The house stacks its rooms, so it has 50m² of roof. The bungalow has 100m² of roof. Every square metre of floor sits directly under cold loft space, and the wall-to-floor ratio is worse too. So a bungalow leaks more heat per square metre than a house with the same floor area, and heat pump surveys regularly land a size band higher than owners expect.

There’s a flip side. All that roof is cheap to fix. Insulating an empty loft to 270mm is one of the best pound-for-pound jobs you can do before a heat pump goes in. The Energy Saving Trust puts the saving from an empty loft at about £190 a year for a semi-detached house and £360 for a detached one, though topping up from 120mm saves only about £17 to £35 (checked September 2026). Do it first and your survey may come back a whole size band smaller, which is cheaper to buy and runs more efficiently. We’ve covered the maths in what size heat pump your property needs.

One more bungalow quirk: noise placement. In a two-storey house the bedrooms are upstairs, away from the outdoor unit. In a bungalow the unit often ends up a few metres from a bedroom window, sometimes yours, sometimes the neighbour’s. Quoted sound levels matter more here than in any other property type.

The picks

We haven’t tested these units — this is based on published specifications and warranty terms, checked July 2026.

Best overall: Vaillant aroTHERM plus 7kW

Vaillant’s MCS-listed SCOP figures for the aroTHERM plus run from 4.36 at 35°C flow to 3.39 at 55°C (MCS-listed figures for the 7kW model, checked July 2026). It runs on R290 refrigerant, will push flow temperatures to 75°C when needed, and the range carries Quiet Mark accreditation with sound power quoted as low as 54dB(A). The guarantee is 2 years as standard, extendable to 7 when a qualifying Vaillant installer fits it with a Vaillant cylinder. The 7kW band suits the 5 to 8kW heat loss a typical insulated three-bed bungalow shows, and the 5kW covers smaller two-beds.

Best on a budget: Grant Aerona 290

Grant’s R290 range comes in 4, 6.5, 9, 12 and 15.5kW single-phase outputs, rated A+++ at 35°C flow, with a 7-year guarantee when fitted by a Grant-trained G1 installer (grantuk.com, checked July 2026). The tight output steps are the draw for bungalows: a 6.5kW unit matches a small bungalow’s load far better than jumping straight to an 8 or 9kW machine from a range with fewer sizes. Grant units are usually quoted below the German brands, though final price depends on your installer.

Best where the unit sits near a bedroom: Samsung EHS Gen 7 R290 8kW

Samsung quotes 35dB(A) at three metres in its lowest quiet mode, with a double-layered sound insulation case, and certifies 100% of rated output at -10°C (Samsung Climate Solutions, checked July 2026). That cold-weather figure matters: some units shed capacity as temperatures drop, exactly when a bungalow’s big roof is bleeding heat. Warranty length depends on your installer’s Samsung accreditation, so get the years in writing with your quote. We’ve reviewed it in full in our Samsung EHS Gen 7 review.

Also worth a look: the Mitsubishi Ecodan R290 Ultra Quiet range (5 to 12kW), quoted at 45dB(A) sound pressure, with warranties of up to 7 years through accredited installers. It’s a strong all-rounder that loses to the Vaillant here only on quoted efficiency at low flow temperatures.

Sizing: resist the urge to go big

The classic bungalow mistake is buying the 12kW unit “to be safe”. An oversized heat pump short-cycles, wears its compressor and misses its quoted SCOP. Your MCS installer must do a room-by-room heat loss calculation, and if the survey says 6kW, buy 6 or 7kW. Our heat pump brand comparison covers how the manufacturers stack up beyond these four.

What it costs

Our modelled estimate for a full air source heat pump installation is around £11,014, with a typical range of £7,200 to £17,100 depending on region and complexity (see how we calculate costs). The Boiler Upgrade Scheme takes £7,500 off in England and Wales, with no income test, and VAT is 0% until 31 March 2027. Homes currently heated by oil or LPG with no mains gas connection get an uplifted grant of £9,000, rather than the standard £7,500, between 21 July 2026 and 31 March 2027. Run your own numbers with our cost calculator.

FAQs

Does a bungalow need a bigger heat pump than a house the same size?

Often, yes. The larger roof and wall area per square metre of floor pushes heat loss up. But loft insulation closes much of the gap, so insulate before you get surveyed, and let the heat loss calculation decide.

Where does the outdoor unit go?

Under permitted development rules in England the unit no longer has to sit one metre from your boundary (that rule ended on 29 May 2025), but your installer must run an MCS 020 a) noise assessment showing no more than 37 dB at 1 metre from the nearest neighbouring habitable room window or door. On a small bungalow plot this can constrain siting, which is why the quieter units earn their place on this list.

Will my existing radiators work?

Some will, some won’t. Heat pumps run best at 35 to 50°C flow, so undersized radiators from the gas era may need swapping for larger ones. Many 1960s and 70s bungalows also have microbore pipework, which your surveyor needs to check before quoting.