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Strange residue in Giannoni heat exchanger
Hello, Tim. There is this strange combustion residue build-up happening in gas fired boilers (don't know about propane) with the Giannoni-type heat exchanger which has flat stainless steel coils spaced close together forming a cylindrical combustion chamber. The cylindrical surface burner resides in the middle of this.
The residue looks variously like coffee grounds or mouse droppings. It builds up and blocks flow of combustion gasses, affecting efficiency and soon bringing the boiler to a stop. Some boilers produce a lot of it, some very little.
I can't get the boiler manufacturer to admit knowing what this stuff is or why it should form only in this type of heat exchanger. They tell me it has to be something in the gas as they know this doesn't happen in Europe with the same product.
Do you know?