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Default high efficiency boiler

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.




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Default high efficiency boiler

ppp wrote:
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.




Must be for a hot water tank.

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Default high efficiency boiler


LSMFT wrote:

ppp wrote:
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.




Must be for a hot water tank.


"Indirect fired domestic hot water"
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