Navien
The Navien PEM750 is an R290 monobloc heat pump offering up to 17kW output, a 4.86 SCOP at 35°C, and a maximum flow temperature of 75°C for high-efficiency domestic heating.
The Navien PEM750 is a series of R290 monobloc air-to-water heat pumps designed for high-efficiency domestic heating and hot water. Ranging from 4kW to 17kW, these units utilize natural refrigerant with a GWP of 3. This technical guide provides engineers with critical installation data, including electrical requirements, hydraulic flow rates, and clearance specifications for the PEM750V004PGKC and larger variants. With a maximum flow temperature of 75°C, it is suitable for both new builds and retrofit projects.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Navien PEM750 series represents a significant shift toward natural refrigerants in the UK domestic heating market. Utilizing R290 (propane), these monobloc units achieve a Global Warming Potential (GWP) of just 3, significantly lower than traditional R32 or R410A systems. The range is comprehensive, spanning from the 4kW PEM750V004PGKC model up to the high-capacity 17kW PEM750V017PGKC, all operating on a standard single-phase 230V supply.
Efficiency is a core metric for the PEM750 range. The units deliver a Seasonal Coefficient of Performance (SCOP) of 4.86 at a 35°C flow temperature, earning an ErP A+++ rating. Even at higher flow temperatures of 55°C, the system maintains an A++ rating with a SCOP of 3.5. A standout technical feature is the ability to reach a maximum flow temperature of 75°C, which allows for greater flexibility when integrating with existing radiator circuits that may not be sized for traditional low-temperature heat pump operation.
From an installation perspective, the outdoor unit dimensions are consistent across the mid-range models at 1166mm wide, 799.5mm high, and 445mm deep. Engineers must account for a unit weight of 105kg and ensure specific clearances are maintained: 250mm at the sides, 700mm at the front, and 200mm behind the chassis to ensure adequate airflow. The hydraulic connection uses 25.4mm pipework, and the system is designed to operate down to outdoor temperatures as low as -25°C, utilizing a reverse cycle defrost method.
Electrical requirements are standard for domestic properties, with a maximum power consumption of 2.8kW for the base models and a startup current of only 1.5A. A 16A MCB is typically required. Control options are versatile, supporting Modbus and Smart Grid Ready protocols, alongside Navien’s proprietary wired and Wi-Fi controllers. Weather compensation is integrated as standard, allowing the unit to modulate output based on external ambient conditions.
The sound profile is optimized for residential environments, with a sound power level (LwA) of 55dB and a sound pressure level of 42dB at one meter. A dedicated quiet mode is available to further reduce noise emissions during sensitive hours. As an MCS-certified appliance, the PEM750 is eligible for UK government grants, provided the installation meets the required heat loss and design standards.
Common questions from engineers and homeowners about the Navien PEM750V008PGKC.
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Specifications on this page are extracted from the manufacturer brochure. Always cross-check against the latest datasheet before commissioning or quoting. Last updated 30 April 2026.