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OK, having had a very useful response to my query on a neutralizer in my dual fuel system I'd like to ask if anyone knows anything about this box? It's the controller which turns on the central heating pump only when the hot water gravity feed gets hot enough, and has two heat sensors, one on...

Hi all - I have a complex dual fuel system which I am trying to figure out to understand one or two problems with it. Any way I have included a pic of the first confusion which is the heat exchanger. The box sits under the tank. There are two pipes (in and out) on each side of the exchanger...