Homeowners Professionals
Vitocal 151-A

Air source heat pump

Compact air source heat pump in monobloc design

Rated heating output: 2.1 to 14.9 kW
Integral DHW cylinder
High energy efficiency
Sustainable operation
Rated heating output

2.1 to 14.9 kW

Integral DHW cylinder

With 190 litre capacity

Highly suitable for modernisation

With 70 °C flow temperature (at an outside temperature down to -10 °C)

Climate Protect +++: Protects the environment and the climate

Environmentally responsible, natural refrigerant R290 (propane) with a particularly low GWP100 (global warming potential) of 0.02


Reliable operation with high efficiency

Service Link

Guaranteed faster response time if a service is required

Cooling function

Heating and cooling in one

Low running costs due to high efficiency

COP (coefficient of performance) to EN 14511: up to 5.0 (at A7/W35)

60 % less space required

Compared to comparable models

Integrated energy management system

Ensures transparency in energy consumption and costs

Easy operation via ViCare app

Easy operation via ViCare app

Outdoor unit of the Vitocal 151-A air source heat pump

Highly suitable for modernisation: Vitocal  151-A

The new generation of heat pumps

Reliable, compact and more environmentally responsible than ever – the new, innovative heat pump technology from  Viessmann makes particularly efficient use of environmental energy for heating and cooling.  With a flow temperature of up to 70 °C, the Vitocal 151-A is perfectly suited for retrofit installations. Subject to a system design meeting industry regulations and best practice, together with a weather compensated heating system, it may be possible to retain existing radiators. High energy efficiency, convenient control via app, sustainable operation and attractive design are all convincing features.

Our integrated range of solutions for the Vitocal 151-A

Value added services, digital services, connectivity & platforms

ViCare app

The ViCare app provides intuitive heating control. Green for go – the user can see at a glance in the app whether their heating system is working as it should.

More about the ViCare app

ViGuide app

ViGuide is an app for trade partners. It has numerous functions for monitoring and controlling systems in both detached houses and apartment buildings and provides rapid access to Technical Service.

More about the ViGuide app

Connectivity Inside

Connectivity Inside is the integrated WiFi interface for operating and servicing systems using Viessmann apps.

More about Connectivity Inside

Benefits of the Vitocal 151-A

Climate Protect+++ protects the environment and the climate

The new heat pumps in the Vitocal  15x series use the "green" refrigerant R290 (propane), which is considered particularly environmentally responsible with its very low GWP100 (global warming potential) of 0.02.

OptiPerform –– reliable operation with maximum efficiency

The advanced heat pumps from Viessmann work with a patented hydraulic system. With Hydro AutoControl®, the heat pump is operated reliably and with maximum efficiency throughout its entire service life. The unique design not only ensures that your contractor can set up the heat pump with OptiPerform much faster and, therefore, more cost effectively. It also takes up much less space because it is up to 60  percent smaller than comparable systems.

Service link –– for faster response time if a service is required

Thanks to mobile technology, the heat pumps in the Vitocal  15x series are always connected to Viessmann Service. Completely free of charge. The heat pump transmits any faults directly and without a time delay. The contractor can undertake the appropriate measures immediately. This eliminates unnecessary travel, which saves time and money.

One system for everything:  Viessmann One Base

Users can easily track their sustainable use of electricity and heat via  Viessmann One Base.  The new platform is the basis for an expandable and futureproof energy system in every home.


You're always in the best of hands

All that is needed to communicate with  Viessmann One Base is the free ViCare app; the integrated Viessmann Energy Management System does the rest. Viessmann One Base is operated quickly and easily via the app. The contractor can also keep a remote eye on the system and correct possible irregularities immediately by electronic means. This eliminates unnecessary travel and appointments with the trade partner.

Viessmann One Base  makes the home more comfortable, efficient and futureproof.

Comfort at the touch of a finger: simple and convenient control of the energy system from anywhere.

Viessmann One Base is operated quickly and easily with the ViCare app

All Viessmann systems and smart home solutions on one platform

With  Viessmann One Base, the entire energy system is operated via just one app –– simply, reliably and quickly. The new platform links all devices and electronic applications in the home into one single climate and energy solution. With beneficial consequences: lower energy consumption, a smaller carbon footprint and an overview of running costs that is always up to date.  Viessmann One Base makes your own four walls fit for a climate friendly future!

Viessmann One Base networks digital services with the complete energy system, including heat pumps, and photovoltaic systems.

Keeping track with the ViCare app

With the energy cockpit in the ViCare app, users can keep track of all the energy flows in their home.  The analysis tool shows current and past levels of self-sufficiency and self-consumption.

The ViCare app's energy cockpit and analysis tool

Viessmann One Base – many benefits at a glance

  • Comfort:  Control the home energy system conveniently via app – at any time, from anywhere.
  • Efficiency: Particularly efficient, cost-effective operation through networking and optimisation of energy flows.
  • Safety:  Automatic notification of system irregularities, together with online troubleshooting capability.
  • Future viability: Future integration of all desired digital services, upgrades and product extensions such as PV with electricity storage and wallbox for e-mobility

Product details

Rated heating output (kW), operating point A7/W35 (to EN 14511)

Type 151-A04: 4.0 kW | type 151-A06 4.8 kW | type 151-A08: 5.6 kW | type 151.A10: 7.3 kW | type 151.A13: 8.1 kW | type 151.A16: 9.1 kW

Coefficient of performance ε (COP) A7/W35

Type 151-A04: 5.0 | type 151-A06 4.9 | type 151-A08: 4.7 | type 151.A10: 5.0 | type 151.A13: 4.9 | type 151.A16: 4.9

Energy efficiency ƞs*

Energy efficiency ƞs at W35 in %: Type 151-A04: 185 | type 151-A06 180 | type 151-A08: 175 | type 151.A10: 190 | type 151.A13: 178 | type 151.A16: 178

*Heating performance data in line with Commission Regulation (EU) No 813/2013 under average climatic conditions for low temperature application (W35) and medium temperature application (W55)

Energy efficiency class, DHW heating


Application area

Detached houses, modernisation projects


Heat pump control unit with 7  inch colour touchscreen, operation via ViCare app possible

DHW heating

Integral DHW cylinder (190  l capacity)

Additional features

For room heating/cooling and DHW heating | Maximum flow temperature: 70  °C (at an outside temperature of down to ––10  °C) | Monoblock indoor unit with heat pump control unit, high efficiency circulation pump for the secondary circuit, 4/3-way valve, safety assembly | Integral instantaneous heating water heater | Integral heating water buffer cylinder and overflow valve

Product cross-section, indoor unit
Product cross-section, outdoor unit
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