On either side of the heat exchanger, I put on a set of "t" fittings that stub out to gate valves. In the 29 years I have used this, I have not had to run acid through it. And I have moderately hard water. The exchanger is a cupronickel type that expands and contracts with each use. This largely eliminates development of hard water scale.
But if I had not put on those fittings/values, then it would have plugged up with scale quickly . . . ! Ha - the perversity of life . . ..
The pump can simply be an inexpensive "Little Giant" type, and then a couple lengths of old garden hose and a plastic bucket for the vinegar.
No biggie.
I really like the tankless system.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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