Flushing an Indirect WH

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Jadnashua

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Given that there isn't that hot interface that you'd get with an electric element or a burner assembly, do you get the same mineral deposits on an indirect? Certainly if you have some debris from the inlet water (sand, etc.), that could benefit from being flushed, but are there water borne mineral deposits in one? Just curious...
 

Dana

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Yes, lime deposits form on the potable water side of the heat exchangers in an indirect too. ( Funny thing about that- the laws of physics are self-enforcing! :) )As a general rule the higher the temperature, the more rapidly they form. If the indirect is set to 160F requiring 180F or hotter water from the boiler it'll lime up faster than if it were kept at 125F. But it's still a lot slower than with electric tanks- there is a lot more surface area, and lower temperatures . Indirect manufacturers sometimes use coatings on the heat exchangers designed to resist lime deposits from adhering rather than bare metal (which would stick pretty well.)
 
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