Viessmann
The Viessmann Vitocal 150-A is a monobloc air source heat pump using R290 refrigerant, delivering 10 to 16 kilowatts of output with flow temperatures up to 70 degrees Celsius.
The Viessmann Vitocal 150-A and 151-A are monobloc air source heat pumps designed for the UK domestic market. Utilizing R290 refrigerant, these units achieve flow temperatures up to 70°C, making them suitable for both new builds and retrofit projects. Available in 10kW, 13kW, and 16kW variants with 230V or 400V electrical configurations, the range includes the 151-A Tower model featuring an integrated 190-litre domestic hot water cylinder for space-saving installations.
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Full technical specifications extracted from the manufacturer brochure. Empty sections are hidden.
The Viessmann Vitocal 150-A and 151-A series utilizes R290 refrigerant, a natural propane-based medium with a Global Warming Potential (GWP) of 0.02. This monobloc air source heat pump range is designed for the UK domestic market, offering a solution for both new installations and heating system retrofits. The range is divided into two primary configurations: the Vitocal 150-A standalone outdoor unit and the Vitocal 151-A Tower, which features an integrated 190-litre domestic hot water cylinder.
Performance is characterized by high flow temperatures, which can reach 70°C even in low ambient conditions. This capability is significant for properties retaining existing radiator circuits. The range includes 10kW, 13kW, and 16kW variants. For the 10kW model, the capacity at an outdoor temperature of -7°C is 9.7kW, while the nominal capacity at 7°C is 7.3kW. Efficiency is high, with a Seasonal Coefficient of Performance (SCOP) of 4.825 at 35°C and 3.7 at 55°C. These figures correspond to ErP ratings of A+++ and A++ respectively.
Electrical flexibility is provided through both 230V single-phase and 400V three-phase models. For example, the AWO-M-E-AC 151.A10 is the 230V 10kW variant, while the AWO-E-AC 151.A10 is the 400V equivalent. The outdoor unit has a physical footprint of 1144mm in width and 600mm in depth, with a height of 1382mm and a weight of 197kg. Sound power levels are measured at 66 dB(A), though the integrated quiet mode can reduce this to 59 dB(A) for installations in noise-sensitive areas.
Installation requires adherence to specific hydraulic and clearance parameters. A minimum water flow rate of 16.67 litres per minute is required, and the system must utilize 28mm pipework. Viessmann mandates the inclusion of a buffer tank and a volumiser to provide sufficient energy for the reverse cycle defrost process and to prevent compressor short-cycling. Minimum clearances include 100mm at the sides, 1000mm at the front, and 150mm above the unit. The system is controlled via the ViCare app and is Smart Grid ready, allowing for integration with modern energy management systems. Compatibility with the Vitocell 100 series cylinders ensures versatile system design options.
Common questions from engineers and homeowners about the Viessmann AWOT-M-E-AC-AF 151.A13 SP.
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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.