Which homes suit a 12 kW heat pump?
A residential 12kW heat pump covers larger family homes of 140 to 180 m² depending on insulation quality. A well-insulated newer house of 180 to 200 m² with underfloor heating may fit within this capacity, while a moderately insulated older house of 140 to 160 m² with radiators is the more typical match. At 150 m², the 12 kW unit is the natural choice for average Serbian insulation standards. Below 140 m², the 9 kW model may be sufficient and more cost-effective. Above 180 m², the 15 kW unit is worth evaluating. The decisive factors remain insulation quality, ceiling height, window area, climate zone and which emitter system is installed. A 150m2 heat pump is one of the most common sizing requests, and CENTRO-GAS provides a free sizing consultation to confirm the right capacity for the actual building.
Why R290 as a refrigerant?
R290 (propane) carries a global warming potential (GWP) of only 3, compared to 675 for R32 and 2,088 for R410A. R290's high critical temperature of 96.7 °C is the reason this unit can produce flow temperatures up to 75 °C without excessive discharge pressure. That is a significant advantage when connecting to existing radiator systems in older Serbian houses that were designed for higher supply water temperatures. The EU F-Gas Regulation is progressively phasing down high-GWP refrigerants, so a 12kw R290 heat pump is already compliant with the strictest future requirements. The refrigerant charge is 0,8 kg, within safety limits for residential outdoor installation, and all R290 piping is factory-sealed inside the monoblock.
How does it perform at very low outdoor temperatures?
EXINDA tests its residential heat pump range in climate chambers down to -35 °C and certifies stable operation at outdoor temperatures as low as -25 °C. At the standard rating point of A7/W35 (7 °C outdoor, 35 °C water), the 12 kW unit delivers its full 12.0 kW. At A2/W35 (2 °C), output is 9.8 kW. At A-7/W35 (-7 °C), output is 8.5 kW. For Serbian conditions, the coldest nights in Vojvodina reach -15 °C to -20 °C in extreme events, while mountain areas in southern Serbia can see sustained temperatures of -20 °C or below. At these temperatures, the unit continues to operate and produce heat at reduced capacity. For critical applications or extreme cold-snap scenarios, a hybrid configuration with an existing boiler as backup is a practical design option, and CENTRO-GAS has the industrial heating background to specify both sides of that system.
What is a full DC inverter and why does it matter?
A DC inverter compressor adjusts its speed continuously rather than cycling between on and off at full power. The practical consequence: the unit operates at 30 to 50 % of nominal load for 60 to 80 % of a typical heating season, and it is in this part-load band that seasonal efficiency peaks. At A7/W35, the COP is 4.7, meaning the unit delivers 4.7 kWh of heat for every 1 kWh of electricity consumed. Across the full European heating season, the SCOP at 35 °C reaches 4.65. A fixed-speed compressor would deliver its rated COP only at full load and waste energy by cycling at every other operating point. The inverter also reduces start-up current to well below the 16 A nominal draw, which matters for older electrical installations.
Ideal buyer profile for the 12 kW unit
The 12 kW model targets a specific and common scenario: a larger family house of 140 to 180 m², built 15 to 30 years ago, with moderate insulation, replacing a gas or oil boiler approaching end of life. The house has underfloor heating, modern radiators, or older radiators that a site survey will assess. A domestic hot water tank of 100 to 500 litres connects for sanitary hot water (the unit supports up to 65 °C DHW temperature). The homeowner wants significantly lower heating costs, supported by the physics that heat pumps deliver roughly 3 to 4 times more heat energy than the electricity they consume. The promotional price while the first container lasts adds a financial incentive to act now rather than wait. CENTRO-GAS delivers the complete solution: sizing, installation by its own technical team or trained local partners, subsidy paperwork assistance, and a maintenance contract. The heat pump can be combined with solar panels for further operating cost reduction.
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