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Plate heat exchangers are a major cause of problems in combi boilers and since most combi boilers use them its worth understanding how they work. In central heating mode, combination boilers heat water in the main heat exchanger and pump it round the heating circuit.
Most combi boiler manufacturers require the fitting of some form of scale treatment device in areas where the hardness is above 200 ppm. (One or two manufacturers claim that because of the design of their heat exchangers, or the turbulence they induce in the water.
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The heating water loses a lot of its heat across the metal plates and is pumped back to the main heat exchanger where it is re-heated. To be able to transfer the heat from the heating water to the mains cold water quickly enough the.
When a hot water tap is run the boiler operates a diverter valve and switches into hot water mode. (Diverter valves cause lots of problems too but thats for another page which, hopefully, will be coming soon.) In hot water mode the diverter valve in.
This gives a very large surface area within a small space but it also creates a problem; the small spaces between the plates are very easy to block up and this happens in two ways.