Which buildings suit a 20 kW heat pump?
The 20kW heat pump serves the upper end of the residential range and the entry point of light commercial capacity. In the residential segment, the target is very large family homes and villas of 230 to 300 m², depending on insulation quality. A well-insulated newer villa of 280 to 300 m² with underfloor heating is an ideal match. A moderately insulated older property of 230 to 260 m² with radiators also fits within the capacity. For a toplotna pumpa 300m2 request, the 20 kW is the natural single-unit solution. Beyond 300 m², multiple units in cascade or a step up to EXINDA's commercial heat pump chillers (12-ton and 24-ton) is the appropriate approach. The unit also serves small multi-family buildings (two to three apartments sharing a central plant) and light commercial premises: guest houses, small hotels, restaurants, clinics and offices. An EXINDA reference directly relevant to this model: a fully electric luxury villa of over 700 m² in Italy, running on three 20 kW R290 units (attributed to EXINDA). CENTRO-GAS provides a free sizing consultation based on actual building data.
Why R290 as a refrigerant at 20 kW capacity?
R290 (propane) carries a global warming potential (GWP) of only 3, compared to 675 for R32 and 2,088 for R410A. At 20 kW, the R290 refrigerant charge is larger than in the smaller residential models but remains within safety standards for outdoor installation. All R290 piping is factory-sealed inside the monoblock, so neither the installer nor the building occupants handle refrigerant. R290's high critical temperature of 96.7 °C allows the compressor to produce high flow temperatures without excessive discharge pressure, maintaining compatibility with existing radiator systems that demand higher supply water. The EU F-Gas Regulation phase-down makes R290 the forward-looking refrigerant choice at every output level.
How does it perform at very low outdoor temperatures?
EXINDA tests its 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 20 kW unit delivers its full nominal output. At lower temperatures, capacity derates progressively: at A-7/W35, output is approximately 15.8 kW. The 20 kW nominal capacity provides substantial headroom for large buildings, meaning the system can cover heating demand deeper into cold-snap events than smaller models before any backup is needed. For critical applications, a hybrid configuration with a backup boiler is a legitimate design option. CENTRO-GAS has the industrial heating background to engineer both the heat pump and the boiler side of a hybrid system. An EXINDA reference: large cascade installations in northern China have run stably at -25 °C to -40 °C since 2010 (attributed to EXINDA).
Why three-phase 380 V and what does it mean for installation?
At 20 kW output, the electrical current draw is substantial. Running this capacity on single-phase 230 V would require very high amperage and heavy-gauge cabling. Three-phase 380 V distributes the load across three phases, reducing per-phase current to roughly one-third of what a single-phase equivalent would draw. The practical benefits for the installer and building owner: standard three-phase cabling is sufficient, circuit breaker sizing stays within common ranges, and the balanced load reduces voltage drops and electrical stress. In Serbia, three-phase 380 V supply is common in larger houses, villas and commercial buildings, so most properties that need 20 kW of heating capacity already have the electrical infrastructure in place. For properties without three-phase power,
the 15 kW single-phase model is the alternative.
Ideal buyer profile for the 20 kW unit
The 20 kW model targets three overlapping profiles. First: a large villa heat pump buyer, a family living in a property of 230 to 300 m², replacing a gas or oil boiler approaching end of life, wanting significantly lower heating costs. The property has three-phase power, underfloor heating or radiators, and space for a large DHW tank. Second: a small commercial operator (guest house, small hotel, restaurant, clinic or office) needing reliable heating, cooling and domestic hot water from a single system, with three-phase power already available. Third: a small multi-family building owner installing a central heat pump plant for two to three residential units. In all cases, the promotional price while the first container is in stock reduces the entry cost, and CENTRO-GAS's subsidy assistance service helps navigate the application process. The complete solution includes sizing, installation by the CENTRO-GAS technical team or trained partners, commissioning and a maintenance contract. Heat pumps deliver roughly 3 to 4 times more heat energy than the electricity they consume, making the 20 kW unit a compelling replacement for ageing boiler systems at any of these scales.
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