Heating with gas and solar – highly efficient and futureproof

The use of solar energy ranks among the most environmentally responsible energy conversions imaginable. In addition, the state has involved itself in investing in these kinds of systems. For the latest information on subsidy programmes, contact your local heating contractor or refer to the product information section on this website.

Using the sun to save energy

Thanks to freely available solar energy, today you can save up to 35 percent on heating costs in detached or two-family houses with a solar thermal system if you use the solar collectors both for central heating backup and DHW heating. It can cover up to 60 percent of the annual energy demand for DHW heating.

Example: Modern detached house

Heat is generated by a gas condensing boiler and is distributed throughout the interior either by radiators or underfloor heating. In addition, a solar thermal system with an approx. 5 m² absorber area is used for DHW heating. The living area is approximately 140 m².


System diagram of heating with gas and solar

Take advantage of these benefits

Gas condensing technology

  • Nothing is as efficient as condensing technology in the field of energy conversion – it achieves energy utilisation of up to 98 %
  • Thanks to low investment outlay, the system will pay for itself in only a few years
  • High alloy stainless steel is used for all condensing boilers and heat exchangers. This guarantees high operational reliability and a long service life
  • Condensing boilers from Viessmann are already prepared for the use of LPG.

Solar thermal

  • Solar energy is available free of charge
  • A solar thermal system offers greater independence from fossil fuels.
  • Energy is converted without harmful CO2 emissions
  • A solar thermal system is the perfect addition to any heating system: It can be used for DHW heating and central heating backup in spring and autumn.
  • All solar collectors stand out on account of their high operational reliability and long service life

Vitodens 343-F gas condensing storage combi boiler

Gas condensing storage combi boiler with solar cylinder

The Vitodens 242-F gas condensing boiler offers energy efficient condensing technology, high performance DHW heating and is prepared for connecting a solar thermal system – all in one compact casing. Rated heating output: 1.9 to 26 kW, cylinder capacity: 220 l, energy efficiency class: A

Vitodens 242-F product info
Vitodens 333-F gas condensing storage combi boiler

Gas condensing storage combi boiler with DHW cylinder

The compact Vitodens 222-F appliance combines efficient heat generation with the highest level of DHW convenience. Rated heating output: 1.8 to 26/35 kW, cylinder capacity: 100/130 l, energy efficiency class: A

Vitodens 222-F product info
Vitodens 300-W wall mounted gas condensing boiler

Wall mounted gas condensing boilers

Vitodens 200-W offer the highest level of efficiency thanks to stainless steel Inox-Radial heat exchangers. With the Vitodens 111-W, an integral loading cylinder ensures the highest levels of DHW convenience. Rated heating output: 1.9/3.2 to 35 kW, cylinder capacity: 46 l (Vitodens 111-W), energy efficiency class: A

Vitodens 200-W product info
Vitodens 343-F gas condensing boiler

Heating convenience par excellence: Gas condensing technology from Viessmann

Bank on leading technology: Viessmann's advanced and highly efficient gas condensing boilers make it easy to keep warm and relax.

Viessmann offers both floorstanding and wall mounted gas condensing boilers that achieve efficiency levels of up to 98 % in turning fuel into energy. Wall mounted gas condensing boilers are perfectly suited to be installed near the living space on account of their compact dimensions and quiet operation.

The stainless steel Inox-Radial heat exchanger combined with the MatriX gas burner, ensures high energy efficiency and a high level of heating convenience for the long term. At the same time, this technology reduces heating bills and minimises emissions. Thanks to the automatic Lambda Pro Control combustion controller, Viessmann gas condensing boilers are already designed to meet future standards, as they can operate with different gas types and biogas mixtures. Consequently, they represent a futureproof and cost effective solution.