The main reason why condensing boilers are efficient is because it can reclaim heat that in other type of boilers would be lost into the environment. Studies have shown that the efficiency levels of condensing boilers are 90 per cent and above. This means that only a small amount of energy goes to waste when heating water. The problem that requires more help from professionals is that many homeowners are not aware of the best temperature they should set their condensing boilers in order to get maximum efficiency.
According to experts, the temperature of the central heating should be 70 degrees Celsius while 60 degrees Celsius should be followed when heating water. Many might be wondering why this is so but the answer is in the way the system for condensing boilers work.
The way a condensing boiler works is different from a traditional boiler. The latter uses fuel when heating water but it is not very efficient because a huge percentage escapes to the flue. The former is equipped with a secondary heat exchanger that can recycle the heat which helps improve the efficiency.
In order for the condensing boiler to work at its optimum efficiency, the surface of the secondary heat exchanger must have the same or lower dew point temperature compared to the fuel used. Dew point temperature is basically the temperature where little water droplets are created. The dew point of natural gas boiler is about 55 degrees Celsius. It means that the water that is coming back to the pipe must be about 55 degrees Celsius or below that. Not meeting this requirement means that the boiler is not working at the highest efficiency possible and it is possible that condensation will not even occur.
Improving the efficiency of a boiler can be done by lowering the temperature. Majority of the new models of boilers will have an indicator for the level at which the condensing mode will operate. If you are not sure about how to reach maximum efficiency for your new condensing boiler, ask for more help from a professional boiler engineer in your area.