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| 11kW–23kW DC Inverter Geothermal / Water Source Heat Pump NULITE DC Inverter Geothermal / Water Source Heat Pump is a high-efficiency solution designed for heating, cooling and domestic hot water applications. With 10kW–23kW heating capacity, the series is suitable for villas, apartments, energy-efficient homes and small commercial projects. Powered by full DC inverter technology and Panasonic R290 inverter compressor, the system intelligently adjusts output according to actual demand, improving energy efficiency, reducing operating costs and maintaining stable indoor comfort. By utilizing stable underground or water source energy, it delivers reliable performance with excellent seasonal efficiency. Featuring Panasonic R290 inverter compressor, high-efficiency plate heat exchanger and Sagimaw 4-way valve & EEV, the unit provides efficient heat transfer, precise refrigerant control and long-term reliability. Supporting heating, cooling and domestic hot water, it can be integrated with floor heating, fan coils, radiators and hot water tanks. With Wi-Fi, RS485 and multi-language controller, NULITE Geothermal / Water Source Heat Pump provides smart control, flexible system integration and an energy-saving solution for modern buildings. Key Features - 11kW–23kW Heating Capacity - Full DC Inverter Technology - Panasonic R290 Inverter Compressor - Heating, Cooling & DHW Function - Stable Geothermal / Water Source Performance - Wi-Fi, RS485 & Multi-language Control | |||||||||
NL-G2S/R290
Nulite New Energy
The NULITE R290 DC Inverter Water Source Heat Pump is an advanced renewable energy solution designed for residential and light commercial buildings, integrating heating, cooling and domestic hot water in one efficient system. Powered by natural R290 refrigerant and DC inverter technology, it delivers outstanding efficiency, stable performance and low-carbon operation by utilizing the constant energy from ground or water sources. Compatible with underfloor heating, fan coils, radiators and DHW tanks, it provides flexible system integration for modern buildings. With intelligent control, quiet operation and reliable year-round performance, it offers a sustainable solution for energy-efficient heating and cooling applications.
The heat pump uses natural R290 refrigerant, helping reduce environmental impact while maintaining strong heating and cooling performance. Compared with traditional refrigerants, R290 is a more sustainable choice for future low-carbon building projects, making the system suitable for customers who value energy efficiency, environmental protection and long-term product competitiveness.
This R290 geothermal / water source heat pump provides space heating, cooling and domestic hot water in one integrated system. It can meet year-round comfort needs for villas, residential houses and light commercial buildings, helping users reduce equipment complexity, save installation space and simplify daily system management.
By using ground loop, water source, lake or river loop energy, the system can achieve more stable operation than ordinary air source units. The water-side heat exchange condition is less affected by outdoor air temperature, helping improve efficiency, comfort and reliability in both heating and cooling seasons.
Equipped with a DC inverter compressor, the unit can automatically adjust output according to real heating or cooling demand. This helps reduce frequent start-stop operation, improve energy efficiency, lower noise level and provide more stable indoor comfort, especially for projects requiring long operating hours.
The NULITE R290 DC Inverter Water Source Heat Pump supports intelligent control through WiFi, RS485 communication and Tuya/Smart Life APP integration. Users can remotely monitor and adjust heating, cooling and domestic hot water settings anytime and anywhere via smartphone. The RS485 interface enables seamless connection with building management systems (BMS) and smart home platforms, providing flexible system integration for residential and commercial applications. With intelligent scheduling, real-time monitoring and convenient remote access, it delivers a smarter, more efficient and comfortable energy management experience.
Third-party thermostats can be used to control the heat pump. Depending on the Nulite controller settings, either a single zone or multiple zones can be managed via third-party thermostats, allowing clients to easily turn the unit on/off or switch between different operating modes.
Featuring Modbus RTU protocol, this unit connects seamlessly with building automation and energy management systems. It provides real-time monitoring of essential operating data—including water temperatures, compressor status, operating mode, fault codes, and energy consumption—and supports remote control of on/off, mode switching, temperature setpoints, and special functions like quiet mode and legionella disinfection. Multi-unit networking permits centralized management of multiple heat pumps.Customers can integrate heat pumps with their existing control systems to achieve remote monitoring and control.
This heat pump adopts PV DC direct-drive technology. Direct current from the photovoltaic array powers the compressor without inverters or battery storage, enabling maximum solar energy utilisation. It delivers energy savings of up to 90% under strong daytime solar irradiance, alongside an overall energy saving of around 60%. The transition between mains and PV supply is seamless: PV power takes precedence, and grid power automatically offsets any shortfall in photovoltaic generation.
The NULITE R290 DC Inverter Water Source Heat Pump is designed to meet European market requirements with CE certification and Declaration of Conformity (DOC). The certification ensures that the unit complies with relevant European safety, health, and environmental protection standards. Combined with strict quality control and reliable component selection, it provides customers with a safe, stable and trustworthy solution for residential and commercial renewable energy applications.
· Compact Integrated Design
Less installation space, easier system planning.
· Smart Inverter Control
Matches output to real demand for stable comfort and lower energy use.
· Flexible System Integration
Compatible with floor heating, fan coils, radiators and domestic hot water.
· Smart & Easy Control
Wi-Fi, RS485 and multi-language control for easier operation and maintenance.
Designed around the stable nature of ground and water sources, the NULITE R290 geothermal heat pump operates smoothly without the noise of an outdoor fan. Intelligent inverter control adjusts output precisely to actual demand, reducing frequent starts and unnecessary mechanical stress.
The stable operating environment, durable internal structure and carefully selected core components help reduce wear over time—giving users less noise, fewer maintenance concerns and reliable year-round comfort.
Smarter Heat Transfer, Lower Cooling Temperatures
NULITE Ground Source Heat Pump features two plate heat exchangers working together with a DC inverter compressor to provide active liquid cooling.
The first heat exchanger absorbs heat from the equipment's circulating liquid, cooling it before sending it back to the equipment. The compressor then transfers the collected heat to the second heat exchanger, where it is released into the ground-source loop.
Unlike passive cooling, which relies on natural ground temperatures, active liquid cooling can deliver coolant temperatures lower than the ground-loop temperature, providing more flexible and reliable cooling for connected equipment.
Lower Cooling Temperatures, Greater Flexibility, Reliable Performance
NULITE Active Liquid Cooling Technology uses compressor-driven refrigeration to deliver lower coolant temperatures, even below the ground-loop temperature. It provides flexible cooling solutions for equipment requiring precise temperature control and consistent cooling performance.
1. Lower Coolant Temperatures
Unlike passive cooling, active liquid cooling can reduce coolant temperatures below the ground-loop temperature, meeting equipment demands for lower-temperature cooling.
2. Stable Temperature Control
DC inverter technology adjusts cooling output according to actual demand, helping maintain stable coolant temperatures and reduce unnecessary temperature fluctuations.
3. Reliable Cooling Performance
When natural ground-source cooling cannot provide sufficiently low temperatures, active refrigeration continues to deliver the required cooling effect within the system's operating range.
Designed for flexible connection with floor heating, fan coils, radiators and domestic hot water systems.
Proper installation should include suitable circulation, filtration, expansion and safety components according to the project design. Hydraulic and electrical connections must follow the product manual and local installation standards.
Heating · Cooling · Domestic Hot Water
Residential Houses
Cold Climate Regions
Villas and Large Homes
Small Hotels and Guesthouses
Commercial Buildings
80+ Countries & Regions Worldwide
NULITE Water & Ground Source Heat Pumps have been installed across 80+ countries and regions worldwide, serving a wide range of residential and commercial projects.
Successful installations can be found in markets such as Germany, France, the Netherlands, Poland, Romania, Serbia, Slovakia, Turkey and more.
Real Projects. Proven Performance. Global Experience.
Can this R290 geothermal / water source heat pump provide heating, cooling and domestic hot water?
Yes. This heat pump is designed as a 3-in-1 system for space heating, cooling and domestic hot water. It can connect to a water tank for daily hot water supply and work with fan coil units or floor heating systems for indoor comfort.
What types of water or ground source systems can it connect to?
What indoor terminals can be used with this heat pump?
Where can this R290 geothermal / water source heat pump be used?
Is the installation complicated?
