Baxi
The Baxi HP40/50-13-1PHMB is a 15.9 kW monobloc air-source heat pump using R32 refrigerant, with a SCOP of 4.49 at 35°C.
The Baxi HP40/50-13-1PHMB is a monobloc air-source heat pump designed for domestic heating applications in the UK. This appliance delivers a nominal capacity of 15.9 kW, utilising R32 refrigerant. This page provides technical specifications, operational data, and installation considerations relevant to heating engineers. Homeowners seeking detailed information on this specific Baxi heat pump model will also find comprehensive data for research and comparison.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Baxi HP40/50-13-1PHMB is a monobloc air-source heat pump, engineered for robust performance in UK domestic heating systems. This inverter-driven unit is designed for external installation, simplifying hydraulic connections within the property. It delivers a nominal heating capacity of 15.9 kW at an ambient temperature of 7°C, maintaining a substantial 10.9 kW output even at 0°C, ensuring consistent heat delivery during colder periods. The unit is rated for operation down to an outdoor temperature of -25°C.
Efficiency is a key characteristic, with a Seasonal Coefficient of Performance (SCOP) of 4.49 when operating at a 35°C flow temperature, and 3.3 for a 55°C flow temperature. This indicates its effectiveness across various system demands, from underfloor heating to higher-temperature radiator circuits. The HP40/50-13-1PHMB utilises R32 refrigerant, with a charge of 1.75 kg, a choice aligned with industry efforts to adopt refrigerants with a lower Global Warming Potential (GWP).
Physical dimensions of the outdoor unit are 1388mm in height, 1388mm in width, and 448mm in depth, with a total weight of 129 kg. These dimensions require careful consideration for siting, particularly regarding the minimum installation clearances of 1500mm to the front and 500mm to the sides to ensure adequate airflow and service access. Sound emissions are rated at a sound power level (LwA) of 68 dB, corresponding to a sound pressure level of 57.5 dB at 1 metre. Electrical requirements specify a 230V, single-phase supply, necessitating a 35A MCB for protection. The hydraulic system is designed for a maximum operating pressure of 3 bar.
Common questions from engineers and homeowners about the Baxi HP40/50-13-1PHMB.
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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.