How a Condensing Boiler Works

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We’ll explain how condensing boilers or condensing heaters work and their residential and commercial applications. Why are condensing boilers more efficient than the standard non-condensing boilers?

We’ll explain what you should think about before adding a condensing boiler to your home or commercial property.

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One of the best I’ve watched thanks from the wetlands of Scotland :)) I’ve now adjusted my pump down from 2 to 1 to get in that return colder sweet spot . Top video Albert Einstein once said the definition of a true expert is to be able to explain things in simple terms .

scottwilson

Good theory explanation. Here in Europe we have metric so I don't understand US temp measurements so cant relate to what is cold .

GB

So essentially a condensing boiler harnesses the waste exhaust heat to preheat the incoming cold water. This results in less energy needed to heat the water to any given temperature.
This process results in condensation (condensate) water, and its disposal ?.

1, Why is the condensate water considered acidic by this process ?.
2, How does a non condensing boiler deal with condensate water which is not captured and disposed of, albeit less efficient ?.

julianhowarth

Usually condensing boilers is efficient at about 85% AT BEST. All boilers is configured in such way that they are NOT efficient. Also lot of people uses them inefficient. To get efficiency you MUST not exceed flow temp of 50c. and as much cold return flow as possible. There should NOT be visible 'smoke' coming from flue. MOST people think if they see 'smoke' (it's just water vapor) coming from flue it means it's in condensing mode. it's INCORRECT. If you see white 'smoke' coming from flue this means you are NOT getting high efficiency your condensation happens OUTSIDE the boiler, because it jut too hot inside to create droplets. Most people uses condensing boilers at VERY high setting like 60c flow temp at which no condensation is happening and boiler efficiency is the same as standard boiler's.
You have to use as low temp as possible to get NEAR the specified efficiency. Your video also have this problem you only talk about RETURN flow temp, while flow temp is important too. The higher flow temp -the less surface of cold area the less condensate. So flow temp is as much important as return temp.
Also most important efficiency requirement is - outside temp sensor attached to boiler and the best would be to have room thermostat too, so boiler could use both data and choose optimal flow temp.

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