I'm replacing an old boiler with a new high efficiency condensing boiler. The old system had 1 circulator pump, the new boiler installation manual shows 2 circulator pumps. One for the boiler loop and 1 for the zones. What is the reason for 2 pumps? A neighbor had a new high efficency boiler installed last year by a licensed contractor and they only put in 1 pump.
- posted
13 years ago