Baxi
The Baxi HP60 and Assure HP55 are 11.5 kilowatt 3-phase monobloc heat pumps using R290 refrigerant, offering flow temperatures up to 75 degrees Celsius and an A plus-plus-plus efficiency rating.
The Baxi HP55_Baxi-HP60113PHMB--Assure-HP55113PHMB-Technical-Datasheet covers two high-performance 11.5 kW monobloc air-source heat pumps designed for high-temperature domestic heating. Operating on a 3-phase 400V supply, these units utilize R290 refrigerant to achieve flow temperatures up to 75°C. With an ErP rating of A+++ at 35°C and a SCOP of 4.77, they provide a low-carbon alternative for UK properties requiring significant thermal output and high-efficiency hot water performance without extensive radiator upgrades.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
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The Baxi HP60-11-3-PHMB and its Assure HP55 variant represent a high-capacity monobloc solution for UK residential and light commercial applications. These units deliver a nominal output of 11.5 kW at A7/W35 conditions, maintaining a capacity of 10.97 kW even when outdoor temperatures drop to 0°C. The use of R290 (propane) refrigerant is a critical technical choice, offering a Global Warming Potential (GWP) of just 3. This refrigerant allows the system to reach maximum flow temperatures of 75°C, making it suitable for retrofit projects where existing radiator sizing might otherwise limit heat pump viability.
Efficiency is a core metric for these models, with a SCOP of 4.77 at 35°C and 3.75 at 55°C. This translates to ErP ratings of A+++ and A++ respectively, ensuring compliance with modern building regulations and energy performance standards. The 3-phase electrical configuration (400V, 50Hz) requires a 16A MCB, distributing the load across phases to reduce the impact on the local grid compared to high-output single-phase units.
Physically, the outdoor unit is substantial, weighing 142 kg with dimensions of 872mm height, 1390mm width, and 523mm depth. Installation requires specific clearances to ensure adequate airflow: 500mm at the sides, 300mm behind the unit, and 1000mm at the front. These clearances are vital for maintaining the specified sound power level of 52 dB(A). For hydraulic integration, the system supports a maximum operating pressure of 3 bar and is compatible with Baxi’s range of ASHP pre-plumbed cylinders.
Control is managed via the Baxi START App, providing end-users and engineers with digital interface capabilities. The units are designed to operate in extreme conditions, with a minimum outdoor temperature rating of -25°C. For long-term reliability, Baxi offers an extended 7-year warranty on parts and labour, provided terms and conditions are met. This warranty is supported by their nationwide engineer network. Because these units contain R290, installers must adhere to specific safety protocols regarding the placement of the monobloc unit relative to building openings and drains, though the low 1.25kg charge simplifies some aspects of the installation compared to larger industrial propane systems.
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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.