I have worked on several new homes with on-demand hot water heaters, and for the most part, they seemed to work well, even very well. But one system seemed to have mineral deposit issues almost immediately. I don't remember the brand name, but it was propane fired, and heated water from a drilled well. it served dual purposes, domestic hot water and hydronic heat, pex in concrete slab. I don't know if the well water was entirely to blame, or if the extra cycles for the heating load accelerated the deposits, but this has always been in the back of my mind. I seldom see the homeowners, so don't know how, or if, the problem was ever resolved, when we finished the house the heating contractor was still trying to figure it out.
Anyone else seen this problem?
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