Thread: Looking for a solution to freezing pipes

My synagogue has an annual issue with pipes freezing some are below slab others are on an outside wall. (this is a common problem with churches as well)

Yes I know - it never should have been done that way.

Since the building is empty for a couple of days a week chances for a freeze up increase and I have thawed them twice in the last week

I have thought about connecting a small circulating pump from the hot water feed to cold water with an isolation valve (connecting this permanent, possibly with temperature controls) but I do not know if this is legal also need to find a small pump something around 1/10 gal per minute.

I am also open to some other ideas

This may offer a solution, short of major plumbing upgrades.

Hot Water On Demand, Hot Water Pump, Circulation Pump: COMFORT | Grundfos

http://ca.grundfos.com/content/dam/G...mfort_Pump.pdf
See page 33 - Comfort Systems

http://ca.grundfos.com/content/dam/G...02_UP10-16.pdf