What Is the Best Heat Pump for a UK Home in 2026?

Search "best heat pump" and you will find endless brand league tables. The honest truth is that the best heat pump is the one correctly sized and designed for your specific home. A superb unit installed badly will underperform; a good unit designed well will delight you.

So before comparing badges, understand what actually makes a heat pump great in a British home — then you can judge any brand on the things that matter.

Four things separate a great air source heat pump from an average one. First, a high seasonal efficiency (SCOP) — the best units deliver up to 4.9 units of heat per unit of electricity. Second, the ability to reach a comfortable flow temperature efficiently, which matters in older homes. Third, quiet operation. Fourth, a low-impact refrigerant, because that affects both environmental footprint and future-proofing against regulation.

Brand names like Vaillant, Daikin, Mitsubishi and Samsung all make reputable units — but the spec that suits a well-insulated new build is not necessarily the one that suits a solid-wall Victorian terrace. Matching the unit to the home is the whole game.

Our default choice is the Vaillant aroTHERM plus, and it comes down to the things above. It uses R290 (propane) refrigerant, which has a Global Warming Potential of just 3 — a tiny fraction of older refrigerants — and it achieves a SCOP of up to 4.9 for excellent real-world efficiency.

R290 also lets the unit reach higher flow temperatures efficiently, which is exactly what many older and period UK homes need. It runs quietly, and Vaillant's build quality and support are excellent. For the British housing stock we work with, it is a consistently strong fit.

R290 (propane) is a natural refrigerant with a Global Warming Potential of 3, compared with the hundreds or thousands of some older refrigerants being phased down under F-gas regulation. Choosing an R290 unit is a genuine future-proofing decision as well as an environmental one.

It also has practical performance benefits: R290 systems tend to deliver higher flow temperatures efficiently, which reduces the need for extensive radiator changes in harder-to-heat homes.

The most expensive heat pump on the market will still disappoint if it is oversized, run too hot or badly commissioned. Conversely, a well-chosen unit designed around a proper heat loss survey will quietly keep your home warm for decades on low running costs.

So our advice is simple: focus on the installer and the design first, the badge second. We will recommend the right unit for your home — usually the Vaillant aroTHERM plus R290 — and design the whole system around it. Start with a free, no-obligation estimate.

“Best” depends on your home, but the criteria that separate a great heat pump from a mediocre one are consistent. Judge any model on these five.

The honest truth: the “best” heat pump is a good R290 unit correctly sized and expertly commissioned for your home. The engineering around the box matters more than the badge on it — which is why two installs of the same model can perform very differently.