The Daikin Altherma 3 H HT: The quintessence of heat pump

 High temperature air-to-water heat pump 


Why the Daikin Altherma 3 H HT?



The new Altherma 3 H HT is Daikin's most innovative air-to-water heat pump design to date which has been created with the focus of being able to be 'plugged into' the majority of retro fits without changing of the existing radiator system.* This  allows retro homes with traditional heating systems who before would struggle to install a heat pump, now switch to a greener more cost-effective solution. 

*Determined on an individual basis in conjunction with the heat loss evaluation of property.

Even on the coldest of days, the Daikin Altherma H HT will operate down to temperatures as low as  -25⁰C, making the system suitable across a range of external temperatures. 


  • Water flow temperatures of up to 70⁰C can be produced without an additional electric heater.
  • Highly efficient CoP's of over 3.5 when producing high temperature hot water. 
  • Suitable for older, larger properties where insulation is limited.
  • Can be combined with an oil/lpg boiler to form a bivalent system, for off gas properties.
  • MCS accredited
  • Eligible for the Renewable Heat Incentive (RHI) grant and Home Energy Scotland loan with cashback scheme. 


The Daikin Altherma 3 H HT can be combined with one of three of Daikin's award-winning indoor units to allow you to tailor your heating system for your comfort and lifestyle. 

  1. Wall mounted: Combined with a separate hot water tank to deliver domestic hot water.
  2. Integrated DHW stainless steel tank model: A compact unit with a small footprint of 595x625 combined with either a 180L or 230L tank suited for properties with limited space. A bizone feature also available to allow individual control of different heat emitters within your home, such as radiators and underfloor heating.
  3. Integrated ECH20 DHW tank model: Combined with a thermal tank this indoor unit can also be connected to thermal solar panels.




Offering a Standard and Low sound mode, the Altherma 3 H HT is the quietest heat pump on the market. With Standard sound mode at 38 dBA - between bird chirping and a library and Low sound mode at 35 dBA, your environment remains undisturbed.



Daikin strived to create a system that not only performed excellently but was designed to fit seamlessly into and compliment any home, both internally and externally. In doing so, the Altherma 3 H HT has been awarded two prestigious design awards.