Gas boilers 
The Viessmann gas boiler range will meet your every demand for an efficient and economical heating system.
Gas condensing boiler
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​With condensing technology, not only is the heat from the combustion of fuel oil or gas utilised, but also the heat that, with non-condensing heating technology, would otherwise escape unused up the chimney. Condensing boilers extract almost all of the heat latent in flue gases and convert it into additional heating energy. To do this, Viessmann condensing boilers are equipped with stainless steel Inox-Radial heat exchangers, which cool the flue gases before they are routed into the stack, to the extent that the water vapour contained within them is deliberately condensed, transferring the additional heat released into the heating system.
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Low temperature gas boiler
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​Whilst older boilers have to be operated with a constantly high boiler water temperature of up to 90 °C, the temperature of the boiler water in Viessmann oil heating systems is regulated according to the outside temperature.