Which homes suit a 9 kW heat pump?
A 9kW heat pump is sized for mid-sized family homes, typically 100 to 130 m² depending on insulation quality. A well-insulated newer house of 120 to 130 m² with underfloor heating is an ideal match. A moderately insulated older house of 100 to 110 m² with radiators may also fit, provided flow temperatures can stay at 55 °C or below. Beyond 130 m², the 12 kW model is worth evaluating. Below 100 m², the 6 kW unit may be sufficient and more cost-effective. The correct answer depends on a heat-loss calculation specific to the property (insulation, ceiling height, window area, climate zone, emitter type), and CENTRO-GAS provides this through a free sizing consultation. A heat pump for 120m2 is one of the most common sizing requests in Serbia, and the 9 kW unit is purpose-built for that range.
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. The EU F-Gas Regulation is progressively phasing down high-GWP refrigerants, making R290 the future-proof choice. From an engineering standpoint, R290's high critical temperature of 96.7 °C allows the compressor to produce flow temperatures of 65 to 75 °C without excessive discharge pressure, which matters when connecting to existing radiator systems that demand higher supply water. EXINDA selected R290 across its entire residential programme because it delivers higher seasonal efficiency at part-load operation compared to equivalent R32 units, and the 9kW R290 heat pump benefits fully from this thermodynamic advantage.
How does it perform at very low outdoor temperatures?
EXINDA climate-tests its residential heat pump range 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 9 kW unit delivers its full nominal output. At A2/W35 (2 °C), output is approximately 8.0 kW. At A-7/W35 (-7 °C), approximately 6.2 kW. For Serbian conditions, the coldest nights in Vojvodina typically reach -15 °C to -20 °C in extreme events, while mountain areas in southern Serbia can see sustained temperatures of -20 °C or below. The 9 kW unit continues to operate and produce heat across this range. For critical applications or extreme cold-snap scenarios, a hybrid configuration with an existing boiler as backup is a practical option, and CENTRO-GAS has the industrial heating background to specify both the heat pump and the backup boiler side.
What does "full DC inverter" mean and why is it the defining feature of this model?
Most heat pumps marketed as "inverter" have a variable-speed compressor but use fixed-speed motors for the outdoor fan and the internal circulation pump. The Exinda 9kW full DC inverter unit goes further: all three motors (compressor, outdoor fan, circulation pump) are variable-speed DC-driven.
Why this matters for installers: the fan speed tracks the compressor's demand curve instead of running at a fixed rpm, which reduces energy consumption at partial load and lowers sound output during mild weather. The DC circulation pump adjusts flow rate to actual thermal demand, eliminating the need for an external variable-speed pump in many installations and simplifying the hydraulic design.
Why this matters for homeowners: a mid-size house heat pump runs at 30 to 50 % of its nominal capacity for most of the heating season. In this part-load band, the triple-inverter architecture achieves its highest seasonal efficiency (SCOP), which is why the difference between a single-inverter and a full inverter heat pump 9kw translates directly into lower electricity bills and noticeably quieter outdoor operation during the months when people have their windows open.
Ideal buyer profile for the 9 kW unit
The 9 kW model is built for a common Serbian scenario: a family house of 100 to 130 m², built in the last 20 to 30 years, with moderate to good insulation, replacing a gas or oil boiler approaching end of life. The house has either underfloor heating (ideal match), modern radiators (good match), or older radiators that a site survey will assess. A DHW tank of 150 to 300 litres connects for domestic hot water. The homeowner wants significantly lower heating costs, backed by the physics that heat pumps deliver roughly 3 to 4 times more heat energy than the electricity they consume. The electrical supply is standard single-phase 230 V. If the homeowner plans to add solar panels, the heat pump integrates with photovoltaic systems to further reduce running costs. CENTRO-GAS delivers the complete solution: sizing, installation by its own technical team or trained local partners, subsidy paperwork assistance, and a maintenance contract.
+381 21 518 887
