NULITE Earth Series is a geothermal water-to-water inverter heat pump for year-round space heating, cooling, and domestic hot water. The range includes six models with modulating heating output from 2 to 36 kW. It uses R32 refrigerant and a Mitsubishi compressor, with Wi-Fi remote control and RS485 connectivity for building automation.
Operating principle and low-grade heat sources
The heat pump transfers energy from a water-source loop to the building system. Depending on the project, the source may be a vertical borehole, a horizontal ground loop, a closed pond or lake loop, or an open-loop well system. The manufacturer's materials also illustrate heat recovery from cooling towers, solar-assisted loops, and industrial waste heat.
Key benefits
- DC inverter modulation matches output to the actual building load.
- COP up to 6.08 at W10/7 °C to W30/35 °C conditions in the manufacturer's table.
- Space heating, passive or active cooling, and DHW within one engineered system.
- Multilingual controller, Wi-Fi, and RS485 for monitoring and BMS integration.
- Compact floor-standing enclosure: 403×667×987 or 555×667×1066 mm depending on model.
Applications
- Private homes, villas, and low-rise residential developments.
- Restaurants, shopping centres, hotels, and office buildings.
- Gyms, swimming pools, and public facilities requiring simultaneous heating and cooling.
- Industrial sites with usable waste heat or a stable water-source loop.
Selection and engineering
Selection is based on design heating and cooling loads, the heating-water temperature, DHW demand, and source-loop conditions. Engineering must verify borehole or water-source flow and temperature, hydraulic resistance, 1.70–5.60 m³/h user-side flow, and 3.0–9.6 m³/h source-side flow. Single- and three-phase variants are shown for selected sizes; power supply and final configuration must be confirmed at order stage.
Performance values are based on the manufacturer's data and vary with operating temperatures. The stated potential energy saving of up to 40% is a manufacturer claim; actual results depend on climate, heat source, building performance, and control strategy.
