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Vitocal 222-A

Air source heat pump

The Vitocal 222-A is a compact air source heat pump in the monoblock design that ensures a high level of DHW convenience with its integrated 220 litre DHW cylinder.

Rated heating output: 3.8 to 11.6 kW
Integral DHW cylinder
Heating and cooling in one
Highest efficiency in the smallest of spaces

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Rated heating output

3.8 to 11.6 kW (A-7/W35)

Pleasantly high level of DHW convenience

Thanks to the integral 220 litre DHW cylinder

Heating and cooling in one unit

Through reversible circuit

Highest efficiency in the smallest of spaces

For straightforward installation in almost any room

Particularly quiet

Thanks to innovative advanced acoustic design

Low running costs due to high COP

Coefficient of performance to EN 14511 of up to 5.0 at 7.0 °C outside temperature and 35.0 °C water temperature

Ideal for use even in terraced housing

Due to low sound pressure level of 35 dB(A) at a distance of three metres

Consume self-generated power

Thanks to preparation for optimised power consumption from photovoltaic systems

Maximum flow temperature up to 60 °C

Even at -10 °C outside temperature

Quick installation; certificate of competence not required

Due to the numerous pre-installed components

Easy to use Vitotronic control unit

With plain text and graphic display

Web-enabled by Vitoconnect

For operation and service via Viessmann apps (accessories)

High product quality

And a modern, timeless design

Vitocal 222-A compact air source heat pump

Vitocal  222-A with integral DHW cylinder

The  Vitocal 222-A air source heat pump is characterised by its separation into an indoor and an outdoor unit, with water-carrying connection lines. In addition to the control technology and high efficiency circulation pump, an enamelled DHW cylinder with a capacity of 220  litres is also installed in the compact indoor unit.

The newly developed inlet system ensures very good stratification, which allows a high draw-off volume of up to 290  litres (at 40  °C). The DHW demand can therefore be met with no difficulty. The compact air source heat pump is also set up to make optimum use of self-generated power from photovoltaic systems. System owners are therefore ideally equipped for environmentally responsible and futureproof heating with renewable energies.

A crucial advantage for system owners is the barely audible operation of the heat pump. In addition, the  Vitocal 222-A monoblock air source heat pump can be used for both conventional heating and cooling in the warmer months of the year. This is made possible by the circuit reversal function.

The  Vitocal 222-A monoblock heat pump makes environmentally responsible and cost effective use of the latent heat in the outdoor air. It can provide heating and cooling. This compact appliance includes an integral 220  litre DHW cylinder.

Vitocal cooling function

These new outdoor units in their timeless design are very easy on the eye. These appliances with one or two fans are designed and manufactured in-house. Consequently, they offer very good performance data, an excellent finish and superb product quality.

The acoustic properties of the outdoor units for the  Vitocal 222-A comply with advanced acoustic design (AAD) specifications. The result is barely audible. In conjunction with intelligent speed control, the high grade, sound-optimised fan significantly contributes to reducing airborne noise in full and partial load operation. Low frequencies that are generally perceived as a nuisance in conventional heat pumps are largely prevented.

With a sound pressure level of only 35  dB(A) at a distance of three metres (night mode), the outdoor unit (with a fan) of the new  Vitocal 222-A compact air source heat pump is one of the quietest appliances of its kind. Installation close to a neighbouring property or in densely built-up areas, such as terraced housing, is therefore no problem. You can also find detailed information about this in the section on  air source heat pumps and sound.

Sketch of a terraced housing area

All components installed in the Vitocal  222-A with DHW cylinder are optimised to work together. The result is high efficiency, which is reflected in the low running costs. Expressed in figures, the  VITOCAL 222-A achieves a COP (coefficient of performance) of up to 5.0 at 7.0  °C outside temperature and 35.0  °C water temperature in accordance with EN  14511. Even at 2.0  °C outside temperature and 35.0  °C water temperature, the COP is still 4.1.

Even with the integral 220  litre DHW cylinder, the indoor unit of the  Vitocal 222-A is extremely compact. Its dimensions (depth x width x height) of 681 x 600 x 1874  mm allow straightforward installation in almost any room. If the Vitocal  222-A is extended to include a ventilation unit such as the Vitovent  300-W or Vitovent  300-F, there is a further advantage: the ventilation unit can be operated with the Vitotronic  200 heat pump control unit that is already fitted. The space required for both systems is thus reduced to a minimum. Detailed information about this subject can be found in the section on  mechanical ventilation.

The compact indoor unit, complete with hydraulics and control unit, is quiet and can be installed near the living space. The lines running to the outdoor unit are filled with water, so the installer does not require a special certificate of competence (refrigerant certificate). Thanks to the hermetically sealed refrigerant circuit, a refrigerant leak test is not necessary either. The high degree of pre-assembled components and coordinated accessories means the  Vitocal 222-A can be installed very quickly.

You can also find detailed information about the refrigerant circuit/refrigerant in the  Vitocal 222-A short brochure.

The EHPA Quality Label serves as proof of the COP (coefficient of performance).  The German EHPA Quality Label Committee has confirmed that Viessmann's  Vitocal 222-A heat pump meets EHPA Quality Label requirements.

  • Can be used at outside temperatures down to -20  °C
  • Monoblock indoor unit with high efficiency circulation pump, 3-way diverter valve, safety assembly, control unit and integral instantaneous heating water heater
  • Control of Viessmann ventilation units possible
  • No refrigerant leak test due to hermetically sealed refrigerant circuit
  • No minimum clearances required between indoor and outdoor units
  • Energy efficiency class* A++ / A | type 221.A04: A+ / A

* Energy efficiency class in accordance with Commission Delegated Regulation (EU) No 811/2013 for heating, average climatic conditions – low (35  °C) / medium temperature applications

For information on the refrigerant circuit/refrigerant, please refer to the brochure.

Product details

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

Type AWOT-M-E-AC 221.A04: 4.0  kW | type AWOT-M-E-AC 221.A06: 4.8  kW | type AWOT-M-E-AC 221.A08: 5.6  kW | type AWOT-M-E-AC 221.A10: 7.0  kW | type AWOT-E-AC 221.A10: 7.6  kW | type AWOT-E-AC 221.A13: 8.9  kW | type AWOT-E-AC 221.A16: 10.1  kW

COP in heating mode

Type AWOT-M-E-AC 221.A04: 4.6 | type AWOT-M-E-AC 221.A06: 4.7 | type AWOT-M-E-AC 221.A08: 4.7 | type AWOT-M-E-AC 221.A10: 4.7 | type AWOT-E-AC 221.A10: 5.0 | type AWOT-E-AC 221.A13: 5.0 | type AWOT-E-AC 221.A16: 5.0

Energy efficiency class*

A++ / A | type 221.A04: A+ / A

* In accordance with Commission Delegated Regulation (EU) No  811/2013 for heating, average climatic conditions –– low temperature application (35  °C) / medium temperature application (55  °C)


Energy efficiency class, DHW heating


Application area

Detached houses, new build and modernisation projects


Easy to operate Vitotronic control unit with plain text and graphic display, web-enabled through Vitoconnect (accessory) and free ViCare app

DHW heating

High DHW convenience thanks to 220  l DHW cylinder

Additional features

Heating and cooling with a single appliance thanks to reversible circuit. Convenient cooling function due to three cooling circuits.

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