Condensing boilers are water heaters fueled by gas or oil. They achieve high efficiency by condensing water vapour in the exhaust gases and so recovering its latent heat of vaporisation, which would otherwise have been wasted. This condensed vapour leaves the system in liquid form, via a drain. In many countries, the use of condensing boilers is compulsory or encouraged with financial incentives.
Practise safe condensate handling - Modern Building Services
You should set the temperature between 60 and 65 °C but for maximum efficiency, it should be set to around 60 °C. Do not set it lower than this as you could increase the risk of contracting Legionnaires disease. Legionnaires is a form of pneumonia thats caused by bacteria in water.
Best Condensing Boiler | Which Boiler has the Highest
Normally, the dew point temperature for natural gas is around 55 degrees Celsius. And so, for the boiler to work in condensing mode, the temperature of the coolant in the return loop (when the coolant returns back to the boiler) should not exceed 57 degrees Celsius. Saving you Money on your Energy Bills
What temperature should a condensing boiler be set at? | Viessmann