I'm replacing an old boiler with a new high efficiency
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.
Nonsense. That would waste a terrific amount of energy. The boiler cycles to
maintain its temperature. A domestic coil can be used for hot water but there
is no bypass to guaranty a fixed amount of water through the boiler.
Nonsense again. The boiler will just cycle off when its temperature limit is
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