Daikin Altherma
The system consists of 4 components which together provide the ideal comfort and water temperature.

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18k
Btu/h		 24k
Btu/h		 30k
Btu/h		 36k
Btu/h		 48k
Btu/h		 54k
Btu/h
Split
System		 Condensing
Unit
Heat Only
Hydrobox
Heating
& Cooling
Hydrobox

1A / Outdoor Unit: an efficient use of energy from the air
Daikin Altherma uses a natural source of energy. The outdoor unit extracts heat from the outside air and transfers it inside through refrigerant piping to supply heating. The compact outdoor unit is easily installed and, as no drilling or excavation work is required, it can also be installed in condos and apartments.

1B / Hydrobox: the Heart of the Daikin Altherma System
The hydrobox heats the water that circulates through low temperature radiators, floor heating systems or fan coil units and also provides domestic hot water. If you opt for the combination of heating and cooling, then the hydrobox can also reverse the cycle to provide lower water temperatures and thus cooling to the home.

2 / Domestic Hot Water Tank: for low energy consumption
As for your domestic hot water, Daikin Altherma is just as clever. The unique lay-out and special placement of the system components maximize energy efficiency. The water inside the storage tank is primarily warmed up by thermal energy from the outside air, thanks to a heat exchanger connected to the heat pump. However, an additional electrical heating element in the domestic water tank can take care of extra heat required in the shower, tub or sink. At necessary intervals the water is automatically heated to 158°F or more to prevent the risk of bacteria growth. With Daikin Altherma, delightfully warm and perfectly safe water can be enjoyed at all times. Depending on the daily consumption of hot water, Daikin Altherma domestic hot water tanks are available in two different sizes.

4 / Solar kit
The solar kit provides the transfer of solar heat to the Daikin Altherma hot water tank via an external heat exchanger. In contrast to tanks with two heat exchangers, this system allows the entire content of the tank to be efficiently heated with solar heat and, if necessary, with heat pump energy.

The Room Thermostat Room Thermostat

The large LCD screen on the room thermostat indicates all the necessary information regarding the setting of the Daikin Altherma system in a blink of an eye. The user can also easily navigate between the different menus whose most common functions and modes include:

  • Setting the temperature of the room based on measurements from the built-in sensor
  • Cooling and heating mode
  • Off function (with integrated frost protection function)
  • Vacation function mode
  • Comfort and reduced function modes
  • Time (day and month)
  • Programmable weekly timer with 2 standard and 5 pre-set programs
  • Keylock function
  • Setting limits. The installer can change the upper and lower limits

The outdoor unit:

  • Compact, weather-resistant and easy to install
  • Contains an inverter controlled compressor for energy efficiency and precise temperature regulation
  • Heat pump operation range: heating and domestic hot water to -4°F outside temperature



Althermo-Outdoor
The scroll-compressors provided are designed as a compact, robust, low-noise device to guarantee optimal operational reliability (no valves and built-in swing-link coupling) and efficiency (through a low initial flow and a constant compression ratio).
Heat exchanger anti-corrosion treatment as standard, the heat exchanger in the outdoor unit is provided with an anti-corrosion treatment. This treatment guarantees and noticeably increases the resistance against acid rain and salt corrosion.
Althermo - Heat Exchanger

Super performance thanks to the inverter principle
The coefficient of performance (COP) of the Daikin Altherma heat pump is also largely attributable to the Daikin inverter principle. An integrated frequency converter adjusts the rotational speed of the compressor to suit the heating demand. Therefore, the system seldom operates at full capacity and your customer only pays for the energy which they actually need.
Althermo - Heat Operation

The Hydrobox:

  • Available in two versions: EKHBH for heating only, EKHBX for heating and cooling
  • Built-in electric back-up heater for additional heating during extremely cold outdoor temperatures or as back-up in case of problems with the outdoor unit
  • 2 shut-off valves to assemble the water outlet and inlet
  • Compact and easy to install: all components are pre-assembled, all parts are easy to reach for maintenance. Wall-mounting is comparable to a traditional gas heater.



  1. Heat exchanger
  2. Expansion tank (2.64 gal.)
  3. Circulator
  4. Tank with back-up heating
  5. Air purge valve
  6. Refrigerant fluid connection
  7. Refrigerant gas connection
  8. Water inlet connection
  9. Water outlet connection
  10. Pressure gauge (water circuit)
  11. Water filter
  12. Pressure relief valve
  13. User interface
  14. Switch box
  15. Flow switch
Hydrobox
Heating and Cooling
If you choose Daikin Altherma with an indoor unit EKHBX, it can not only heat the house, but also cool it. The heat pump is then equipped with a reversible 4-way valve, whereby the refrigeration cycle is reversed and heat is removed from the rooms. The indoor unit can cool rooms via under floor cooling or fan coil units.
Set temperature limits
To prevent incorrect manual adjustments, temperature limits can be implemented for both cooling and heating. With under floor heating, for example, it is important that the temperature of the water is controlled to the type of floor element. To prevent condensation problems, the temperature for floor cooling can never be lower than 64.4°F. For fan coil units, the water temperature can be allowed to decrease to 41°F.