Which homes suit a 15 kW heat pump?
A 15kW heat pump covers the overlap between large residential and small commercial applications. In the residential segment, the target is large family homes and villas of 180 to 230 m², depending on insulation. A well-insulated newer villa of 220 to 230 m² with underfloor heating is an ideal match. A moderately insulated older house of 180 to 200 m² with radiators also fits, provided flow temperatures can stay at or below 55 °C for optimal efficiency. The 200m2 heat pump query is one of the most common in this capacity range. For small commercial spaces (guest houses, small offices, clinics, restaurants), the 15 kW unit can serve as the primary heating source or integrate with an existing system. Below 180 m², the 12 kW model at its own promotional price may be the more cost-effective choice. Above 230 m², the 20 kW three-phase model is the next step. CENTRO-GAS provides a free sizing consultation based on actual building data.
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 allows the compressor to produce flow temperatures up to 75 °C without excessive discharge pressure, making the 15kW R290 heat pump compatible with existing radiator systems that demand higher supply water temperatures. At 15 kW capacity, the R290 charge remains within safety limits for outdoor residential installation, and all refrigerant piping is factory-sealed inside the monoblock. The EU F-Gas Regulation is progressively phasing down high-GWP refrigerants, making R290 the future-proof choice across the output range.
How does it perform at very low outdoor temperatures?
EXINDA tests its residential and light commercial 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 15 kW unit delivers its full nominal output. At lower temperatures, capacity derates progressively: at A-7/W35, output is approximately 11.2 kW. For large Serbian homes, the 15 kW nominal capacity provides a buffer that smaller units lack, meaning the system can maintain comfort deeper into cold-snap events before needing backup. For critical applications or extreme scenarios, a hybrid configuration with an existing boiler remains a legitimate design option, and CENTRO-GAS has the industrial heating background to engineer both sides.
What does DC inverter mean at 15 kW capacity?
The DC inverter compressor continuously adjusts speed to match the building's actual heating demand rather than cycling between full power and standby. At 15 kW capacity, this matters more than at smaller outputs because the gap between nominal capacity and typical part-load demand is wider. A 200 m² house in mild autumn weather may need only 4 to 6 kW of heat, less than half the unit's rating. The DC inverter modulates down to this level, running the compressor slowly and efficiently rather than blasting at 15 kW and shutting off. The result: high seasonal efficiency (SCOP) across the full heating season, low noise during mild weather, and reduced electrical stress on the single-phase supply. The inverter also softens start-up current, which is important when running 15 kW from a standard domestic electrical panel.
Ideal buyer profile for the 15 kW unit
This model targets two overlapping profiles. The first is a large house heat pump buyer: a family living in a villa or larger house of 180 to 230 m², replacing a gas or oil boiler that is approaching end of life, wanting significantly lower heating costs. The house has underfloor heating, modern radiators, or older radiators that a site survey will assess. The second is a small commercial operator: a guest house, small hotel, clinic, restaurant or office needing reliable heating, cooling and domestic hot water from a single system. In both cases, the single-phase 230 V supply requirement is a decisive advantage, since many large homes and older commercial buildings do not have three-phase power. The promotional price while the first container is in stock adds a financial incentive, and CENTRO-GAS's subsidy assistance service helps with the paperwork. The complete solution includes sizing, installation, commissioning and a maintenance contract.
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