Baxi
The Baxi HP60 and Assure HP55 are 11.5 kilowatt 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-HP60-11-1-PHMB-and-Assure-HP55-11-1-PHMB-Technical-Data is an 11.5 kW monobloc air-source heat pump designed for domestic heating and hot water. These inverter-driven units utilize R290 refrigerant, allowing for high flow temperatures up to 75°C and high efficiency with a SCOP of 4.77 at 35°C. Engineered for the UK market, they provide a low-GWP solution for both new builds and retrofit projects requiring high-temperature performance without internal refrigerant handling.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Baxi HP60-11-1-PHMB and Assure HP55-11-1-PHMB represent a single technical platform branded for different market segments. This 11.5 kW monobloc air-source heat pump is an inverter-driven system designed to provide efficient heating and domestic hot water. A primary technical advantage is the use of R290 (propane) refrigerant, which has a Global Warming Potential (GWP) of just 3. This natural refrigerant enables the unit to achieve maximum flow temperatures of 75°C, making it a viable option for properties where traditional low-temperature emitters cannot be installed or where high-temperature hot water sterilization is required without excessive immersion heater reliance.
Efficiency is a core metric for these units, with a Seasonal Coefficient of Performance (SCOP) of 4.77 at a 35°C flow temperature and 3.75 at 55°C. These figures result in an ErP rating of A+++ and A++ respectively. The unit maintains a nominal capacity of 11.5 kW at an ambient air temperature of 7°C with a 35°C water flow. Even as ambient temperatures drop to 0°C, the capacity remains robust at 10.97 kW. The system is designed to operate in extreme conditions, with a minimum outdoor operating temperature of -25°C.
From an installation perspective, the outdoor unit is a significant piece of hardware, weighing 140 kg and measuring 872 mm in height, 1390 mm in width, and 523 mm in depth. Engineers must ensure adequate clearances for airflow and maintenance: 500 mm on the sides, 1000 mm at the front, and 300 mm behind the unit. The hydraulic circuit is rated for a maximum operating pressure of 3 bar. Electrically, the unit requires a 230V single-phase supply and should be protected by a 32A MCB.
Noise management is addressed with a sound power level of 52 dB(A) and a sound pressure level of 44 dB(A) at a one-meter distance. For control and commissioning, the units are compatible with the Baxi START App, facilitating digital setup and monitoring. The system is designed to work seamlessly with Baxi ASHP Pre-Plumbed Cylinders or standard ASHP-specific cylinders. When installed by a qualified professional and registered correctly, the appliance is eligible for an extended 7-year warranty, providing long-term assurance for the end-user.
Common questions from engineers and homeowners about the Baxi HP60-11-1-PHMB and Assure HP55-11-1-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.