I agree that more zones open would decrease flow resistance which would allow faster turnover of the water thru the boiler.lsayre wrote:Conclusion: The overall systems head does not remain constant or go up as more zones open, but rather it decreases as more zone valves open.
whistlenut wrote:Keep a spare circ on hand(gaskets also), a 5/8" and 11/16" open end/ box end. Penetrating oil the bolts NOW unless they were anti-seized when installed. Shut off flanges or valves in place? Keep a spare zone valve head on hand, also.
As to circs or zone valves; depends........many system are hybrids with both. They are both very effective, but if the 'one circ' fails......with no replacement handy......on a twenty below evening.......
Gonna be a costly error on your part.
Carbon12 wrote:@ Sting:
I seriously thought about not adding that,.....I didn't want to steal your thunder! I guess I did, however.