General Engineering Contractor
- Reaction score
- northfork, california
If the circulated water is potable water, the pump must be a bronze or ss body. All of the companies make both iron and bronze pump$. Don't remember is this is strictly a (closed) heating loop, or if it is potable water you're moving around.
If its ductile iron, its as good as bronze. The Grundfos circulators I have used many of have such small wetted area of iron, that it seems totally irrelevant to anyones safety. Maybe you get a few micro grams of iron each decade, less than your multi-vitamin.