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I will be using a brazed plated heat exchanger for a snow melting job....question is how to control it.....i want to use a tekmar control #665....or #667 but the #667 just shows a boiler just for the snow melt in the application brochure.....with out a heat exchanger ...can the #667 with injection pumping be used with a heat exhanger...???....boiler heats home too thanks Paul S