Caldameg Heating System (EDKXT2-1D-264)

CALDAMEG 4.5kW Heating System-01

The Caldameg™ Heating System is a patented 'smart heat pump + buffer system'. The system is specially designed for a direct replacement of the gas boiler. By applying the Caldameg™ heating system, the energy label of the house improves directly. It's an ideal addition for zero on meter projects.

How does it work?

The Caldameg™ Heating System consists of an efficient 4.5kW CO2 heat pump (air/water) in combination with a PCM buffer tanks of 264 litres. The CO2 heat pump is unique because of the high temperature output of 80°C. A high output temperature is necessary when you want to connect the heat pump to radiators or convectors. The existing installation in the building does not need to be fully adapted. The system is therefore ideal for renovation. Another advantage is that the CO2 heat pumps achieve better efficiency in the winter. In comparison to a traditional heat pump, a CO2 heat pump can handle much better with very cold outside temperatures. CO2 is a natural gas and more environmentally friendly than its chemical counterparts. Do you have questions about specific applications? Please feel free to contact us.

principe diagram 4.5


The existing installation in the house does not require modification: just replace the boiler, with Caldameg™. The CO2 heat pump for outdoor installation can be placed on flat roofs, against the façade, in the garden et cetera. Prefab in-roof constructions are available for installation on sloping roofs. The buffer tank can be easily placed on different locations inside the house. For example, the buffer tank can replace the boiler in the same location. It is also possible to adapt the shape of the buffer to the situation in the home. It is recommended that the installation is performed and maintained by an authorised installer (STEK certification is not a requirement).

In the Netherlands, this product is available at the Technische Unie. If you want to order this product from outside the Netherlands please contact us directly. The Caldameg 4.5kW heating system can be viewed and experienced at the Sustainability Inspiration Centre of the Technische Unie in Zwolle, The Netherlands. This new showroom offers an overview of the latest solutions in the field of making buildings more sustainable. For more information, please visit

At 'Find a specialist' you will find all Thuiscomfort specialists in the Netherlands who have experience with heat pump systems. is an initiative of the Technische Unie.

4.5kW CO2 Heat pump

Electrical supply230V/50Hz + A
Heating capacity 1*
4.3 kW
Power consumption 1*
1.3 kW
COP 1*3.1
Max. outlet temperature
operating range (outdoor temperature)
-20°C tot 40°C
Max. pressure gascooler
157 bar
Type compressor DC-inverter
Semi-hermetic suction (Panasonic)
Refrigerant code
refrigerant quantity
1.3 kg
Max. water debiet
110 l/h
Noise level 2*
≤ 44 dB(A)
83 kg
Dimensions (L x W x H)
750 x 390 x 1245 mm
RAL 7043 (traffic gray B)
Water-side pressure drop
45 kPa
¾” male thread

1* With an outside temperature of 7ºC, inlet temperature of 20°C and an outlet temperature of 85°C.
2* The noise level is an average of 9 measured positions at a distance of 1 meter in a soundproof room.

PCM buffer

264 liter
Empty weight
100 kg
Operating weight
370 kg
Dimensions (height x diameter)
1580 x 680 mm
Tilt size1690 mm
Steel (S235JRG2)
Max. running temperature
Max. pressure
3 bar
Energy storage capacity
9.3 kWh
Insulation foam
75 mm Polystyrene
Insulation shell
PVC (gray)

Control unit

Electrical supply
230V/50Hz + A
Temperature sensors
4 x PT1000
2-way valve
24V/0-10V modulating
room thermostat
On/off - OpenTherm