Daikin Altherma 3H HT — quietest
Japanese quality with a high 70°C flow temperature — the ideal fit for older and historic UK homes.
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MCS-certified installers who fit and quote the Altherma 3H HT in your area — with your £7,500 grant applied to every quote.
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Key specifications at a glance
| Efficiency (SCOP) | 4.6 |
| Noise level | 40–48 dB |
| Refrigerant | R32 |
| Max flow temperature | 70°C |
| Cold-weather capability | Reliable operation in UK winter conditions |
| Warranty | 5 years |
| Price after £7,500 grant | £4,200 – £9,000 |
SCOP is the seasonal efficiency figure from MCS-certified spec data. Prices are typical installed guide ranges for a 3–4 bed home after the grant.
Buy the Daikin Altherma 3H HT
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Our verdict on the Daikin Altherma 3H HT
Daikin is one of the world's biggest heating and cooling manufacturers, and the Altherma 3H HT is its flagship UK heat pump. Its party trick is a high 70°C flow temperature — a heat pump capable of running with the 60–70°C system a typical gas boiler leaves behind, which makes it one of the best choices for older, draughtier and historic homes where radiators can't easily be enlarged.
It marries that flexibility with a healthy SCOP of 4.6, quiet operation and a solid 5-year warranty. If you're worried an air source heat pump won't cope with an uninsulated or heritage property, the Altherma 3H HT is the model to shortlist.
What sets it apart
- 70°C flow temp — works with existing radiators in old homes
- SCOP 4.6 — efficient despite the high-flow flexibility
- Quiet, premium Japanese build quality
- Reversible — can run cooling in summer
- Wide range of sizes to match property load
Who it’s best for
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Daikin Altherma 3H HT FAQs
- MCS Certified — https://mcscertified.com
- Energy Saving Trust — https://energysavingtrust.org.uk
- Ofgem BUS Scheme — https://www.ofgem.gov.uk/environmental-and-social-schemes/boiler-upgrade-scheme-bus
SCOP reflects the MCS-certified manufacturer datasheet. Price is a typical installed range after the Boiler Upgrade Scheme grant and should be confirmed by a site-specific quote. Manufacturer: https://daikin.co.uk