Panasonic vs Daikin heat pumps: which wins in 2026?

Quick answer: Panasonic wins on paper: the Aquarea L series posts a SCOP up to 5.06, runs R290 and carries a seven-year warranty through its installer scheme. Daikin answers with a wider model range, a much larger UK installed base and Altherma 3 prices from £9,500 installed before the grant (checked July 2026).

Two Japanese giants, two different UK strategies. We haven’t tested either range; this comparison rests on published specifications, warranty terms, installer pricing guides and review data, checked July 2026. Prices are before the £7,500 Boiler Upgrade Scheme grant unless stated.

Head-to-head numbers

Price ranges are from installer pricing guides (SolarInfo and SwitchHeat, checked July 2026). Both ranges include models covered by the £7,500 Boiler Upgrade Scheme, and our own modelled install figure for an average home is £11,014 (how we calculate costs).

Efficiency and refrigerant

Panasonic’s headline SCOP of 5.06 against Daikin’s 4.2 to 4.7 looks decisive. In pounds it’s smaller than it looks. On 10,000kWh of annual heat demand at the 26.32p cap rate, a SCOP of 4.8 costs about £544 a year and a SCOP of 4.5 costs £580. Thirty-six pounds. System design, radiator sizing and flow temperature will swing your bill more than the badge does.

The refrigerant gap matters more over 15 years. The Aquarea L runs on R290, which reaches 75°C flow for radiator retrofits and sits comfortably ahead of tightening F-gas rules (Panasonic spec pages, checked July 2026). The Altherma 3 generation runs R32: still compliant, still capable, with claimed operation down to -25°C, but the older refrigerant path.

One caution on every quoted SCOP: these are laboratory figures at set test points, not a promise for your radiators. The same machine plumbed into generous emitters at 35°C flow will beat its own brochure; run it at 55°C into undersized radiators and it’ll disappoint. Which is why the survey matters more than the logo.

Warranty and the installer question

Panasonic gives five years as standard, rising to seven through accredited installers (SolarInfo, checked July 2026). Daikin gives three years unless the system is registered on its Stand By Me platform and fitted by an accredited installer, at which point it stretches to seven. Both brands reach seven the same way, through the installer’s paperwork, so ask to see the warranty registration before you settle the final invoice.

Where Daikin pulls clear is presence. Around 4 stars across more than 2,200 UK Trustpilot reviews (checked July 2026) tells you the installed base is very large, and more installers quoting a brand means keener prices and easier servicing. Panasonic has no UK heating-specific review listing, so owner evidence is scarce. The product may be excellent; you’re simply taking more of it on the spec sheet.

Parts and callouts follow the same logic. A brand with more UK installs has more engineers who know it, more vans carrying the right spare, and shorter waits in February. None of that shows on a spec sheet. And it’s the kind of thing owners mention long after they’ve forgotten the SCOP.

Hot water and house fit

Panasonic’s L generation includes an All-in-One version that packages the hydraulics and cylinder into a single indoor tower, which spares you finding a separate cylinder cupboard and suits tighter retrofits (Panasonic product pages, checked July 2026). Output tops out at 9kW in the L-series models listed on Panasonic’s UK pages (checked July 2026), and that is an honest limit: a large, draughty detached house may need more machine than the range offers.

Daikin’s catalogue is among the widest in the UK mainstream, from small monoblocs to higher-output splits with integrated tank options. Above 10kW on the heat-loss survey, the Daikin conversation continues. The Panasonic one may not. For a typical semi needing 5 to 8kW, both fit comfortably and the choice returns to the factors above.

Our verdict

Buying on engineering: Panasonic, for the refrigerant, the longer standard warranty and the efficiency headroom. Buying on ecosystem: Daikin, for installer choice and a long UK record. For most three-bed semis either is a sound machine, and the deciding factor should be the quality of the heat-loss survey in front of you, not the logo. If your quotes cluster at the value end of the market instead, read our Grant Aerona3 and Samsung EHS Gen 7 reviews. Then run your own numbers in the calculator or start with the heat pump guide.

FAQs

Are both eligible for the £7,500 grant?

Yes. Both ranges include MCS-certified air-to-water models covered by the Boiler Upgrade Scheme in England and Wales, which runs to March 2030.

Which is quieter?

Panasonic quotes an ErP sound power of 52dB(A) for the 5kW Aquarea L (product pages, checked July 2026), and we could find no independent like-for-like test between these brands in July 2026. Treat noise claims as marketing until you hear an install running.

Is R32 a reason to avoid Daikin?

No. R32 systems remain legal, supported and effective. R290 is the direction of travel, and it buys higher flow temperatures, but a well-designed R32 system beats a badly designed R290 one every time. Buy the design, then the refrigerant.