Altherma 3 H HT R290 (6 kW)
Daikin's R290 high-temperature unit; the credible answer when you need 65°C+ flow without dropping the radiators. The pragmatic retrofit choice.
- SCOP (35°C)
- 4.85
- Running cost
- £1,380/yr
- Installed
- £11,500–£14,500 installed (before grant)
Editorial render. Not a manufacturer photograph; we do not redistribute press imagery without a licence.
Primary question · Can a heat pump genuinely replace a gas boiler in a less-than-perfect house?
A solid-wall Victorian or Edwardian where wholesale radiator replacement isn't on the table.
£11,500–£14,500 installed (before grant)
- Real high-temperature performance
- Best efficiency in its class at 55°C+
- Daikin's UK service network
- Pricier than the standard R32 Altherma
- Larger outdoor footprint
Open the cost planner to estimate your installed price.
Key specifications
- Output
- 6 kW @ A7/W35
- SCOP (35°C)
- 4.85
- SCOP (55°C)
- 3.60
- Max flow temp
- 75 °C
- Refrigerant
- R290 (propane)
- , Real high-temperature performance
- , Best efficiency in its class at 55°C+
- , Daikin's UK service network
- , Pricier than the standard R32 Altherma
- , Larger outdoor footprint
Vaillant★★★★★aroTHERM plus 7 kW- SCOP (35°C)
- 5.05
- Running cost
- £1,180/yr
1970s–2000s 3-bedWell-insulated semisQuiet neighbourhoodsReadHouse Verdict9.3/10
Mitsubishi Electric★★★★★Ecodan PUZ-WM85- SCOP (35°C)
- 4.55
- Running cost
- £1,290/yr
Service-network depthConservative retrofitsReliability-first buyersReadHouse Verdict8.6/10
If your brief matches "a solid-wall victorian or edwardian where wholesale radiator replacement isn't on the table.", the Altherma 3 H HT R290 (6 kW) is a confident pick. If it doesn't, the alternatives above are more honest answers.
Estimate your installed cost
The planner uses your specific home; not a brochure number.