Viessmann Heat Pumps
Air-Source Heat Pumps

Giving you heating and hot water throughout the year, air source heat pumps generate heat energy from the surrounding air. They continue to work even when temperatures outside dip as low as -15°C.

Made in Germany

Heat Pumps


A heat pump is a device that draws heat energy from the building's surroundings (air, ground, or water) and transfers it to the central heating installation. In this way, it obtains clean, ecological energy at low costs (electricity used to power the compressor). It is used for heating the building, utility water, and also for cooling rooms in hot weather. While looking for a comfortable and cheap solution for heating your home we often think about using a heat pump. Most importantly, we want the heat pump to provide lower costs of our heating and we want it to be reliable to us for many years. The reason for that is that the prices of fuels are changing rapidly. They are getting higher every year and it is difficult to predict what the situation will be in the next few years. Two-thirds of the cost of maintaining a building is related to heating. By using an inexpensive heat source, we can ensure low heating costs for up to 50 years. Currently, heat pumps are a reliable, economical, and environmentally friendly source of heat with a guaranteed future. In Switzerland, every third house is already equipped with a heat pump. 



What is an air source heat pump system?

An air source heat pump can be a low-carbon form of central heating that moves heat from a natural outdoor element, such as the air, into your home when used in conjunction with renewable energy sources. They can take heat from outside in temperatures as little as -15 degrees and convert it into usable heat, with the help of electricity, to provide you with underfloor heating or hot radiators.

These appliances work by generating heat from the environment using a similar principle to a refrigerator, only in reverse. A fridge works by extracting the warm air out of the appliance, therefore reducing the temperature. An air source heat pump instead uses the heat from outside and brings it into your home.

For this process to occur, a fan is required to draw air in and transfer it to a heat exchanger (or evaporator). Here, the refrigerant that contains the newly acquired heat is circulated and compressed using electricity to generate even more heat. This can then be transferred to the heating and hot water systems in your home. Air source heat pumps have an outdoor unit that fits to the side of your home, and the size you require will depend on the size of your home, the number of people living there and your heating and hot water demands.

Why choose an air source heat pump?

So, why is an air source heat pump right for you?

Thanks to the highly efficient design and the system’s efficiency, these solutions can generate heat even when the temperature outside is as low as -15°C. This dispels the myth that heat pumps are only effective in warmer climates and they can continue to gather warmth even when temperatures drop at night.

As well as providing heat during the colder months, air source heat pumps can serve as cooling systems during the summer, too. With an air source heat pump cooling system, you’ll benefit from a versatile solution that can help you to enjoy comfort at home throughout the year, and not just in winter.

In addition, air-source heat pumps can be easier to install than ground source heat pumps, particularly for retrofit, so if you’re concerned about messy installation work, you needn’t be. They also eliminate the need for fuel deliveries and storage, require minimal maintenance and have a long lifespan. 

The Vitocal air source heat pumps product line-up

Air source heat pumps

Giving you heating and hot water throughout the year, air-source heat pumps generate heat energy from the surrounding air. They continue to work even when temperatures outside dip as low as -15°C.

Vitocal 200-A Heat Pump

Vitocal 222-A Heat Pump


The unit operates in heating mode to reach and keep the temperature inside a DHW cylinder (not supplied) to the setpoint value. A 3-way diverter valve (not supplied) is needed, together with a temperature sensor (T5 probe, L = 10m, provided) to be inserted into one well of the DHW tank.


- Electrical booster (backup heater box) Suitable for indoor installation, it consists in an electric heating element (3kW, 230V-1-50) mounted inside a painted sheet metal box, complete with electrical control panel. The heat pump uses the booster for integration purposes. It is used also as a backup out of the operational limit conditions or for alarm.


Guaranteed for outdoor air temperature down to -20°C, thanks to the intervention of all the available sources inside the heat pump: the machine operating in heating mode, together with the onboard electric heating element (as a standard on the plate heat exchanger) and the electric booster (if installed).


It is inside in a compartment, protected from the air flow, to simplify the maintenance operations. It comprises an electronic circulator (brushless DC motor), water flow switch, automatic air vent, water pressure gauge, expansion vessel, safety valve, water filter. The plate heat exchanger and water piping are thermally insulated to prevent condensation on the external surfaces and reduce temperature loss.


The internal controller manages the inverter system and the correct operation of the compressor. It integrates regulation algorithms based on pre-set climatic curves, which can be selected by the user. It is then possible to handle the DHW circuit, alarm alerts, pump anti-seize cycle and integration with external heating sources. An evolved timer is included for climatic and acoustic comfort program.


(boiler or electric heating element). Depending on the parameters set, these sources can intervene as integration of the heat pump, when there is requirement for space heating or for DHW production. The external sources can be automatically switched on, also as a backup, in case the heat pump cannot work for anomaly error or operational temperature limits.


The unit, when active in heat or cool mode, modulates the frequency of the compressor with the aim to keep system temperature to the setpoint value.


Scheduling on 6 time bands per each day of the week, with specification of the operating mode (COOL / HEAT / DHW) and the required setpoint.


It is possible to define daily time bands and corresponding set point for ECO and COMFORT modes, either in heating or cooling operation


This manual function permits to reach DHW setpoint in the shortest time, using all available heating sources.


Provided the function is enabled, it is possible to schedule up to 2 periods (normally night/rest ones) when the appliance shall operate in low-noise mode. The maximum frequency of the compressor will be thus reduced, together with fan’s speed. Acoustic drop rate can be set in 2 levels.


using an external contact. The unit can be switched on and off via an external contact.

A summary of the advantages of an air source heat pump

  • Free heat source available at any time of day
  • Relatively low investment costs
  • Expandable thanks to cascade function
  • No official approval required
  • Suitable for both new builds and modernisation projects
  • Retrofitting possible
  • Environmentally friendly


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