With a hot water (boiler) system (below), water
circulates through coils around the flue passages (10) .
The hot water in the coils is then pumped through the
baseboards by a circulator motor (11) in a continuous
loop. The expansion tank (12) is a cushion of air and
water that periodically adjusts to keep a level pressure
on the boiler.
With a steam (boiler) system, water is
vaporized, creating steam that rises through
the radiators. In this case, no circulator
is needed. If the level of water is too low
to create steam, the low water cut-off shuts
down the system to prevent damage.
The flue gas emissions created by combustion exit at the
flue (13) and into the chimney.
Hot Water (Boiler)
System -
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