NULITE PolarX Series R32 is a compact household all-in-one heat pump combining an air-source inverter unit with an integrated buffer tank. It provides space heating, cooling, and domestic hot water. Three single-phase models cover a modulating heating-output range from 3 to 12.5 kW.
Integrated layout
The 70 L water volume in NL-B245II/R32 and NL-B300II/R32 and the 80 L volume in NL-B345II/R32 help stabilise hydronic flow and temperature, reduce cycling, and simplify compact-system layouts. A 2 kW auxiliary electric heater is also built in. Maximum stated water-circuit working pressure is 0.8 MPa.
Key features
- 3-in-1 heating, cooling, and DHW with combined operating modes.
- Mitsubishi twin-rotary inverter compressor and R32 refrigerant.
- Ambient operation from −25 to +43 °C.
- Wi-Fi, RS485, linked-switch input, and outputs for a three-way valve and water pump.
- Dual fans, a large evaporator, and an integrated 70–80 L buffer tank.
- IPX4 protection, DN20 water connections, and manufacturer-stated sound level up to 50 dB(A).
- ErP class up to A+++ at 35 °C and A++ at 55 °C depending on model.
Applications
- Private homes, cottages, and townhouses with limited plant-room space.
- Small apartments, guest houses, and country properties.
- Underfloor heating and low-temperature radiators.
- Fan coils for heating and cooling.
- Domestic hot water via a separate indirect cylinder.
- Retrofit systems benefiting from a factory-integrated buffer tank.
Technology and system design
The brochure highlights a large evaporator, dual low-noise fans, and an inverter compressor. The built-in buffer does not replace a DHW cylinder: sanitary hot water is produced in a separate tank through a dedicated circuit and three-way valve. The exact hydronic layout depends on required modes and heat emitters.
Selection and installation
The model is selected from building heat loss, supply-water temperature, and cooling load. Rated water flow is 1.5–1.8 m³/h. Installation must provide clear intake and discharge airflow, service access, condensate drainage, and a stable base. Available single-phase electrical capacity must be checked for both the heat pump and its built-in 2 kW heater.
Parameters are based on the supplied brochure. The stated built-in tank is a hydronic buffer and is not a potable hot-water cylinder. Actual output and efficiency depend on air and water temperatures, hydronic design, and installation quality.
