The test winner among air source heat pumps impresses with its whisper-quiet operation, convenient control and high energy efficiency that helps to conserve valuable resources and save costs.
The Vitocal 250-A is one of the quietest appliances of its kind: thanks to its low sound emissions of 30 dB(A) at a distance of four metre, it is barely audible.
The powerful outdoor units in monoblock design (A16, A19) are particularly suitable for heating system modernization projects. As the heating output has been significantly increased for particularly low outside temperatures (down to minus 15 degree), larger buildings in colder regions can also be equipped with the new Vitocal 250-A series.
The compact indoor unit is based on the tried and tested Vitocal 250-A series. The patented Hydro AutoControl® hydraulic system ensures reliable and highly efficient operation over the entire service life, making installation as easy as replacing a gas condensing boiler.
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Viessmann is a leading provider of climate solutions for all living spaces. Viessmann's integrated range of solutions makes it possible to seamlessly connect products and systems via digital platforms with services for climate (heating, cooling & air quality) and refrigeration solutions. A key component is connectivity: existing systems dating back to 2002 can be connected via the Vitoconnect internet interface. This means that the systems are upgradeable and can be controlled from anywhere at any time. All new appliances already feature the integrated Viessmann One Base electronic platform, which networks the products and systems of Viessmann's integrated range of solutions and connects them with digital services. This creates comprehensive and seamlessly linked climate and energy solutions that work together optimally thanks to integrated Viessmann Energy Management.
According to the new German Buildings Energy Act (GEG), which came into force on 1 January 2024, new H2 100 % ready gas appliances can be installed without meeting the 65 % RE (renewable energy) requirement if the building in question is located in a yet to be designated hydrogen grid expansion area. Gas condensing boilers in the Vitodens 300/200 series from Viessmann manufactured from 1 January 2024 onwards can be converted for operation with 100 % hydrogen in accordance with the requirements of GEG Section 71k (Appendix B). The appliances will be converted using a conversion kit that can be efficiently installed during normal maintenance work. Certification of the gas condensing boilers in combination with the conversion kit takes place in accordance with the valid specifications of ZP 3100.100 and EN 15502. The conversion kits are expected to be available as standard from 1 January 2026.
Viessmann Invisible is the groundbreaking heating and ventilation solution that allows design freedom and optimum use of space. To achieve this, Viessmann combines a latest generation heat pump, a ventilation module, a DHW cylinder and all the accessories in one compact system, creating space for new room concepts. All components are concealed behind a slimline plumbing wall installation that is less than 30 centimetres deep. This can transform a utility room, which may previously have been full of various technical equipment, into an additional, usable living space. Side by side, corner arrangement or as a block: Viessmann Invisible can be sited in a range of different ways in newly built single-family houses of up to 200 m2. Thanks to standardised and factory-configured components, Viessmann Invisible is versatile and allows design freedom – from the floor plan of the building upwards.
Viessmann One Base is an intelligent electronic platform for controlling energy systems. For example, a Vitocal heat pump can be very easily supplemented with a Vitovolt photovoltaic system and a Vitocharge power storage unit. All users need for control is the free ViCare app, which already has Viessmann Energy Management integrated for efficient, resource-saving system operation. Trade partners also benefit from the intelligent platform: Viessmann One Base networks the products and systems in Viessmann's integrated range of solutions and links them with digital services. Be it a Vitocal heat pump, Vitodens gas condensing boiler, Vitoair ventilation system or Vitovolt photovoltaics – commissioning, maintenance, service and monitoring are taken care of using a single application, the ViGuide app.
With its variable output adjustment, the Vitocal 250-A PRO is a heating and cooling solution that can be tailored to individual project requirements in larger residential and commercial buildings and businesses. One appliance generates up to 38 kW of heating output. For larger outputs, a cascade of up to four appliances (up to 152 kW in total) is possible. Only one compact indoor unit is required for this. The weather-compensated heat pump control unit for space saving wall mounting can control up to three heating/cooling circuits with mixer and one heating water buffer cylinder. The Vitocontrol A PRO control unit (indoor unit) can be readily integrated into the building management system. This means that the heat pump system can be remotely controlled and its operation monitored from a central control centre. The system data can be controlled and called up from anywhere at any time via a standard BACnet IP or Modbus TCP/IP connection.
This new gas condensing boiler is a highly efficient solution for apartment buildings, commercial enterprises and local authorities. Eight output sizes from 80 to 640 kW and a function for cascade operation for an output of up to 5120 kW make it particularly flexible. The innovative Inox-Crossal heat exchanger made of high grade stainless steel enables a high power density with maximum reliability. With its handling width of just 75 cm, the Vitocrossal 300 CI3 is also recommended for modernisation projects in buildings where space is limited. It also stands out thanks to its very modest overall space requirement of just 0.75 to 1.07 m2 (80 to 640 kW). The MatriX cylinder burner with a modulation range of 1:10 offers clean combustion. The self-calibrating O2 sensor, which automatically adjusts the burner to different gas types, ensures consistently high combustion quality. To further reduce CO2 emissions, hydrogen blends of up to 20 % can be used alongside natural gas/LPG P.
We are Viessmann Climate Solutions. Founded in 1917 as a heating technology manufacturer, and now part of Carrier, today we are one of the world's leading providers of efficient and systemic climate (heating, water and air quality) and renewable energy solutions for the residential and commercial sector.
Our integrated solution offering seamlessly connects products and systems via digital platforms and services to a holistic climate and energy solution, thus creating a safe and reliable feel-good climate for our users. All activities are driven by our company purpose, "We create living spaces for generations to come". This is the responsibility that we take on every day together with our (trade) partners.
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