For natural gas boilers, the dew point is around 55C. This is the temperature at which water droplets form. Is your condensing boiler in condensing mode?įor the condensing boiler to operate at maximum efficiency, the secondary heat exchanger’s surface needs to be equal to or below the dew point temperature of the fuel used. Through this process, waste energy is recycled and the return pipe requires less energy to heat it as it has been pre-warmed. The return pipe is then heated by this process, before flowing back into the main heat generator. Ideally, this should be internally led to a drain where condensate pipes are led outside, there’s a danger of freezing in cold weather. This condensate, which is slightly acidic, is taken from the boiler via a condensate pipe. The process of doing this condenses water vapour in the exhaust gasses, recovering some of the heat that would have otherwise have been wasted out the top of the flue. In a condensing boiler, the return pipe enters a secondary heat exchanger, which has the job of capturing heat from the waste gasses in the flue. This water will be warm but not as hot as the flow, as some heat is released into your rooms, via radiators, to heat them. The return pipe is the pipe that comes back in from your radiators. This is effectively the same for all boiler types.
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The flow pipe has passed through the boiler’s main heat exchanger and is heated via fuel burning. The flow is the pipe heading out of the boiler, which is used to heat your radiators. Using a boiler for your central heating, you have two pipes, the flow and the return. With a condensing boiler, there’s a secondary heat exchanger, which is designed to recycle some of this heat, boosting efficiency. With a traditional boiler, fuel is burned to heat your water but a large portion of this is lost out of the flue.
How condensing boilers workįirst, it’s important to understand how a condensing boiler works. To cut running costs, further lowering the temperature of your central heating and hot water is required, although getting the right level is a little more fiddly. The simple answer is setting your central heating to a temperature of around 70C and your hot water to 60C should give you the highest efficiency levels for your boiler, although this doesn’t necessary mean the lowest running costs.
#Dew point temperature full
Yet, if your boiler is set at the wrong temperature you won’t get the full efficiency, so what’s the best temperature for a condensing boiler? In fact, condensing boilers have efficiency levels of greater than 90% that is, little energy is wasted heating water. One of the big benefits of condensing boilers is their ability to reclaim heat that would otherwise be lost out of the flue, improving efficiency.
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