Daikin Altherma Air Source Heat Pump
Daikin's Altherma 3 range covers split and monobloc air-to-water heat pumps. The Altherma 3 R split pairs a compact outdoor unit with an indoor hydrobox; the Altherma 3 H HT reaches 70°C flow for homes keeping their radiators. Daikin rates the 3 R to keep working down to -25°C and the 3 H HT to -28°C.
Daikin Altherma air source heat pump price UK (2026)
The Boiler Upgrade Scheme takes £7,500 off in England and Wales (£9,000 for off-gas homes replacing oil or LPG heating, until 31 March 2027); your MCS-certified installer claims it for you. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland has no equivalent. 0% VAT until 31 March 2027 is already reflected. Smallest model: Altherma 3 R 8kW from £7,000 pre-grant. Largest: Altherma 3 H HT 14kW up to £14,000. Running cost estimated at ~10,000 kWh of heat a year and 26.32p/kWh electricity (October to December 2026 cap). Accurate as at October 2026.
Warranty: 2 years as standard; 5 years free once Daikin's Stand By Me cover is activated, with annual maintenance; 7 years (years 6 and 7 paid) through partner installers.SCOP is the MCS-certified seasonal efficiency; sound power is the maker's declared ErP figure, the like-for-like noise measure (what you hear next door depends on distance and siting). Prices are indicative; confirm with your MCS-certified installer.
Available Models
Altherma 3 R 8kW
Altherma 3 H HT 14kW
Specifications from the makers' datasheets and the MCS product directory, checked October 2026; prices are indicative. Running costs: Estimate for 10,000 kWh of heat a year at 26.32p per kWh (Ofgem price cap, October to December 2026), at a 45°C design flow temperature: the midpoint of the certified 35°C and 55°C SCOPs. Post-grant figures illustrate the £7,500 Boiler Upgrade Scheme in England and Wales. Confirm current models and exact pricing with your MCS-certified installer.
Pros
- Split design with a compact outdoor unit (58.5 kg for the 3 R 8kW)
- Altherma 3 H HT reaches 70°C flow for radiator systems
- Rated to work down to -25°C (3 R) and -28°C (3 H HT)
Cons
- Standard warranty is 2 years; 5 needs Stand By Me activation and annual maintenance
- The 3 R 8kW has a high sound power (62 dB(A)), so siting matters
Best for
Buyers wanting a split system with a small outdoor unit, or 70°C flow for radiators (3 H HT)
Daikin Altherma pricing and grants in your region
The hardware is the same everywhere; the support is not. England and Wales use the £7,500 Boiler Upgrade Scheme, Scotland the Home Energy Scotland grant and loan, and Northern Ireland currently has no grant. Each regional guide covers exactly what applies.
Daikin Altherma air source heat pump FAQ
How much is a Daikin Altherma air source heat pump installed in the UK (2026)?
A Daikin Altherma air source heat pump costs £7,000 - £14,000 fully installed in the UK before any support (indicative, June 2026, with 0% VAT already applied). After the £7,500 Boiler Upgrade Scheme grant in England and Wales, that is illustratively £0 - £6,500 out of pocket. The smallest model (Altherma 3 R 8kW) starts around £7,000 pre-grant; the largest (Altherma 3 H HT 14kW) tops out around £14,000. Combi-to-cylinder conversions and radiator upgrades add to these figures, so always confirm with a written quote.
Is a Daikin Altherma heat pump eligible for the £7,500 grant?
Yes. Every air-to-water unit on this page qualifies for the Boiler Upgrade Scheme in England and Wales when it is fitted by an MCS-certified installer, who applies for the grant on your behalf so it comes straight off the quote. Off-gas homes replacing oil or LPG heating can claim £9,000 instead, until 31 March 2027. Scotland uses the Home Energy Scotland grant and loan instead; Northern Ireland currently has no equivalent scheme. Grant details accurate as at October 2026.
Is Daikin Altherma a good air source heat pump brand?
Daikin's Altherma 3 range covers split and monobloc air-to-water heat pumps. The Altherma 3 R split pairs a compact outdoor unit with an indoor hydrobox; the Altherma 3 H HT reaches 70°C flow for homes keeping their radiators. Daikin rates the 3 R to keep working down to -25°C and the 3 H HT to -28°C. Daikin Altherma is best suited to buyers wanting a split system with a small outdoor unit, or 70°c flow for radiators (3 h ht).
What is the warranty on a Daikin Altherma heat pump?
2 years as standard; 5 years free once Daikin's Stand By Me cover is activated, with annual maintenance; 7 years (years 6 and 7 paid) through partner installers. Workmanship cover for the installation itself comes separately from your installer. Most extended terms depend on registering the product and annual servicing, so keep your installation paperwork and MCS certificate.
How efficient is a Daikin Altherma air source heat pump?
The Altherma 3 R 8kW has an MCS-certified SCOP (seasonal coefficient of performance) of 4.36 at 35°C flow and 3.24 at 55°C, so over a heating season each 1 kWh of electricity delivers about 3.24 to 4.36 kWh of heat, depending on how hot your system runs. At a 45°C design flow and the Ofgem cap rate (26.32p/kWh), 10,000 kWh of heat costs an estimated £695 a year, against roughly £890 for a 90%-efficient gas boiler at the current cap gas rate (7.97p/kWh from 1 October 2026). Estimates, not quotes; heat pump time-of-use tariffs can do better.
How long does a Daikin Altherma heat pump last?
With an annual service, heat pumps are generally expected to run well beyond their warranty period (Daikin Altherma: 2 years, up to 7 with conditions). Longevity depends on correct sizing (the MCS heat-loss survey), sensible siting and regular servicing. Confirm design life and extended-warranty options for your specific model with your MCS-certified installer.
Daikin Altherma vs other brands: which should I pick?
Daikin Altherma sits at the value end of the UK market on pre-grant pricing. It offers a split option with a compact outdoor unit (the Altherma 3 R) and a high-temperature model that reaches 70°C flow (the 3 H HT). See the side-by-side comparisons below for direct head-to-head specs.
Daikin Altherma vs other heat pump brands
Heat pump guides
- Air source heat pump installation cost in the UK
- The best air source heat pumps in the UK, compared
- The £7,500 Boiler Upgrade Scheme, explained
- Air source heat pumps: costs, grants and brands
- Heat pump grants in London
- Heat pump grants in South East England
- Heat pump grants in South West England
- Heat pump grants in East of England
- Heat pump grants in East Midlands
- Heat pump grants in West Midlands
- Heat pump grants in Yorkshire and the Humber
- Heat pump grants in North West England
- Heat pump grants in North East England
- Heat pump grants in Scotland
- Heat pump grants in Wales
- Heat pump grants in Northern Ireland
Other heat pump brands
Where are you?
See indicative costs and local installers for your area