John Siegenthaler, P.E.

There are hydronic design concepts in which flow must pass backward through a non-operating circulator, perhaps thousands of times over the life of the system.

Flow reversal is possible in a P/S system, but is it practical?

A ‘dirty dozen’ things that point to trouble ahead.

When — and when not — to use reverse return piping.

Twenty years ago, the contemporary approach to prevent interference between simultaneously operating circulators in a hydronic system was primary/secondary piping.

A seemingly good idea that doesn’t work.