Thanks Dave. I'm not getting too far with the manufacturer unfortunately so looking for the advice of the experienced folks here.

When you hook up your heat exchanger, make sure you use schedule 80 pvc, the regular stuff can't take the expansion of the heat exchanger and starts to leak, that's why galvie was put in mine and it was a bad move.

As far a metal content goes-- just don't want to have to go through this again so want to make certain that any old water or metal that's sitting in pipes, filter sand, etc will not cause staining again.

Thanks,

Mark