Baxi
The Baxi HP60-13-3-PHMB and Assure HP55-13-3-PHMB are 13.5 kW monobloc air source heat pumps using R290 refrigerant, achieving an A+++ ErP rating at 35°C and offering a 7-year extended warranty.
The Baxi HP60-13-3-PHMB and Assure HP55-13-3-PHMB are monobloc air source heat pumps for UK domestic heating. This reference provides detailed technical specifications, performance data, and installation considerations for heating engineers. Homeowners researching these 13.5 kW units will find information on efficiency, sound emissions, and hot water compatibility. Data is derived from manufacturer documentation, focusing on key operational parameters.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
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The Baxi HP60-13-3-PHMB and Assure HP55-13-3-PHMB represent a robust solution in the domestic air source heat pump market, offering a nominal heating capacity of 13.5 kW at A7/W35 conditions. These monobloc units utilise R290 (propane) refrigerant, which has a Global Warming Potential (GWP) of 3, significantly lower than traditional HFC refrigerants. The refrigerant charge is 1.25 kg. This design choice aligns with evolving environmental regulations and sustainability objectives for UK heating systems.
Performance data indicates a Seasonal Coefficient of Performance (SCOP) of 4.7 at 35°C flow temperature and 3.73 at 55°C, contributing to an ErP rating of A+++ for 35°C applications and A++ for 55°C. These efficiency figures highlight the unit's capability to deliver effective heating with reduced operational costs. The heat pump can achieve a maximum flow temperature of 75°C, ensuring compatibility with higher temperature heating systems where required, and operates effectively down to an outdoor ambient temperature of -25°C.
A key consideration for installation in residential areas is sound emission. The unit has a sound power level of 52 dB(LwA) and a sound pressure level of 44 dB(A) at 1 metre. It also features a quiet mode, indicating manufacturer attention to acoustic performance. For planning purposes, the MCS-020 planning distance is 1 metre. Physically, the outdoor unit measures 872 mm in height, 1390 mm in width, and 523 mm in depth, with a weight of 142 kg. These dimensions require adequate clearance during installation, specifically 500 mm to the sides, 1000 mm to the front, and 300 mm above.
Electrically, the Baxi HP60-13-3-PHMB and Assure HP55-13-3-PHMB operate on a 3-phase, 380V, 50Hz supply, requiring a 16A MCB. Hydraulic connections are designed for operating pressures between 1.5 and 3 bar. For domestic hot water, compatibility is confirmed with Baxi ASHP Pre-Plumbed Cylinders and generic ASHP Cylinders. The heat pump is compatible with the Baxi START App for control. Baxi offers an extended warranty of 7 years, subject to terms and conditions, providing long-term assurance for installers and end-users.
Common questions from engineers and homeowners about the Baxi HP60-13-3-PHMB and Assure HP55-13-3-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.