Originally posted by Harold Kestenholz:
As an aside, many folks like quick-and-dirty answers. The domestic hot water loop is better served by an individual circulator. The other zone could then be transferred to the zone valve that served the water heater.
Thanks for the quick and dirty solution. Do you see any problems adding a circulator in front of the primary circulator for all the zones? Otherwise have a major rework to do.
Another quick fix is to just serve the new loop by a new circulator. Both of these suggestions would probably settle the matter without a brain drain learning the technical information.