Viessmann targets easy boiler replacement


28 April 2022
Viessmann Vitocal 151-A indoor and outdoor units

Viessmann has launched two new-generation monobloc air source heat pumps, the Vitocal 150-A and Vitocal 151-A, said to be ideal for replacing boilers in the UK’s existing housing stock. Each is available with outputs of 10, 13 and 16 kW.
Both the wall-mounted Vitocal 150-A and the floor-standing Vitocal 151-A have a high maximum flow temperature of 70°C (at an outside temperature down to -10°C), meaning that in most cases they can use existing radiators and do not require underfloor heating. Both use the same control platform as Viessmann’s boilers, so that they are compatible with the rest of Viessmann’s product range. And both integrate previously separate system elements in the indoor unit (IDU), reducing installation time by a full two hours. 

The Vitocal 151-A has an integral, 190-litre DHW cylinder, yet remains compact. Both models are quiet in operation thanks to Viessmann’s Super Silent Design.  

With a COP (Coefficient of Performance) of 4.9-5.0 (according to EN 14511 for A7/W35 and depending on the model), the new heat pumps generate up to five times the usable heat for heating and hot water from one kilowatt hour of electricity and heat from the outside air.  

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Commissioning these new heat pumps is also said to be easy, due to the Vitoguide app. The patented Hydro AutoControl hydraulic function assists reliable integration into existing heating systems. The Service Link integrated internet connection allows for remote updates with a fast connection, even if there is domestic internet disruption and the unit is not connected to the internet. 

Viessmann’s marketing director, Darren McMahon, said: “When the time comes for homeowners to replace their boilers, more are now looking for renewable alternatives. The Vitocal 150-A and 151-A air source heat pumps help answer this growing need. The end-user gets an efficient, environmentally-friendly solution that delivers heat like a boiler; the engineer gets a unit that’s much easier and faster to install. Having fewer pieces of equipment has cut the time needed for installation by 90 minutes.”  

The Vitocal 150-A and 151-A go on sale in the UK in May. Installation training courses for these new products are available now through the Viessmann Academy.