Baxi
The Baxi Assure HP55-13-1-PHMB is a 14kW air source heat pump with an A+++ ErP rating at 35°C and a 52dB sound power level, suitable for high-capacity domestic heating.
The Baxi HP55_UK_Assure_HP55-13-1-PHMB is a 14kW air source heat pump designed for domestic heating and hot water applications. According to manufacturer documentation, this unit achieves an A+++ ErP efficiency rating at a 35°C flow temperature and A++ at 55°C. With a sound power level of 52dB, it balances high-capacity output with managed acoustic performance. This technical guide provides engineers with essential specifications, identification data, and installation considerations for the Assure HP55 range.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Baxi Assure HP55-13-1-PHMB represents a high-capacity solution within Baxi's air source heat pump portfolio, specifically targeted at the UK domestic market. Identified by GC number 7898262, this model provides a nominal heating capacity of 14kW, making it suitable for larger properties or those with higher heat loss requirements. As an air-to-water system, it extracts thermal energy from the outdoor air to provide space heating and domestic hot water.
Efficiency is a core metric for this appliance. The manufacturer's ErP data indicates an A+++ rating when operating at a 35°C flow temperature, which is the standard for underfloor heating or oversized radiator systems. For traditional radiator circuits requiring a 55°C flow, the unit maintains an A++ rating. These ratings suggest high seasonal performance, though specific SCOP values should be verified against the full technical datasheet for precise site-specific calculations.
Acoustic performance is often a critical factor in UK planning applications under MCS-020. The Assure HP55-13-1-PHMB is rated with a sound power level of 52dB. This measurement represents the total sound energy emitted by the outdoor unit. Installers must use this figure when performing noise assessments to determine the minimum distance from neighbouring habitable rooms, ensuring compliance with Permitted Development rights.
The unit is part of the broader Assure HP55 product family, a range developed to meet the evolving requirements of the UK’s decarbonisation strategy. While specific refrigerant details and physical dimensions are not provided in the primary ErP extract, the 14kW output suggests a physical footprint typical of high-output monobloc or split systems. Engineers should note that as a 14kW unit, electrical supply requirements and startup currents must be cross-referenced with the property’s existing fuse board and local DNO (Distribution Network Operator) requirements.
For installers, the Assure HP55-13-1-PHMB offers a high-output alternative to smaller domestic units, filling a gap for detached dwellings or light commercial retrofits. Proper hydraulic design, including the assessment of required flow rates and potential buffer tank integration, remains essential to ensure the 14kW capacity is delivered effectively without excessive cycling. Always refer to the latest Baxi technical manuals for specific wiring diagrams and hydraulic schematics.
Common questions from engineers and homeowners about the Baxi 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.