Baxi
The Baxi HP60 and Assure HP55 are 13.5 kilowatt R290 monobloc heat pumps featuring a 75 degree Celsius maximum flow temperature and a seasonal efficiency of 4.7 at 35 degrees.
The Baxi HP60-13-1-PHMB and Assure HP55-13-1-PHMB are 13.5 kW monobloc air-source heat pumps designed for domestic heating and hot water. Utilising R290 refrigerant with a low GWP of 3, these units deliver high-temperature performance up to 75°C. This technical guide provides engineers and homeowners with essential data on efficiency ratings, physical dimensions, and electrical requirements for the Baxi HP60 and Assure HP55 range, ensuring accurate specification and installation for UK properties.
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The Baxi HP60-13-1-PHMB and Assure HP55-13-1-PHMB represent a high-capacity monobloc solution for the UK domestic market. These units provide a nominal heating capacity of 13.5 kW at A+7/W35 conditions, maintaining a robust output of 12.54 kW even when outdoor temperatures drop to 0°C. A primary technical advantage is the use of R290 (propane) refrigerant. With a Global Warming Potential (GWP) of just 3, R290 allows these heat pumps to achieve flow temperatures up to 75°C, making them suitable for properties where traditional radiator systems are retained.
Efficiency is a core metric for these models. At a 35°C flow temperature, the units achieve a Seasonal Coefficient of Performance (SCOP) of 4.7, earning an ErP A+++ rating. When operating at a 55°C flow temperature, the SCOP remains high at 3.73, maintaining an ErP A++ rating. These figures indicate high seasonal efficiency across varying UK weather conditions. Sound performance is also managed effectively, with a sound power level of 52 dB(A) and a sound pressure level of 44 dB(A) at one metre, supported by an integrated quiet mode for noise-sensitive environments.
Installation requires careful site planning. The outdoor unit measures 872mm in height, 1390mm in width, and 523mm in depth, with a net weight of 140 kg. Engineers must observe specific minimum clearances: 300mm to the rear, 500mm to the sides, and 1000mm at the front to ensure adequate airflow and service access. The hydraulic system is rated for a maximum operating pressure of 3 bar. For hot water provision, these units are compatible with Baxi ASHP Pre-plumbed cylinders and standard ASHP cylinders.
Electrically, the HP60 and Assure HP55 are single-phase units operating at 230V and 50Hz. A 32A MCB is required for circuit protection. Control is managed via the Baxi START App, providing end-users with remote monitoring and adjustment capabilities. While the standard warranty terms apply, an extended 7-year warranty is available, backed by Baxi’s nationwide engineer network, provided specific terms and conditions are met during installation and registration. This combination of high-temperature capability and low-GWP refrigerant positions these units as a viable alternative to fossil fuel boilers in larger UK dwellings.
Common questions from engineers and homeowners about the Baxi HP60-13-1-PHMB and Assure HP55-13-1-PHMB.
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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.