Modern high-efficiency boiler configuration

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Modern High Efficiency Modern High Efficiency Boiler Configuration

Text in the illustration

expansion tank on hot side
supply plumbing
combustion air intake
air separator on suction side of pump
pump away from boiler
exhaust vent
to system
backflow preventer before water makeup valve
alternative location for expansion tank
pressure reducing valve
from system
condensate drain
simplified for clarity
high-efficiency boiler

Generated explanation

The schematic shows a high-efficiency boiler with separate combustion air intake and exhaust vent piping, and a condensate drain at its base. Red piping carries heated water from the boiler to the system, while blue piping returns water from the system. An expansion tank connects to the hot side, with an alternative tank location shown beneath the air separator. The air separator is on the suction side of the circulator pump, which pumps away from the boiler toward the system. Makeup water supply plumbing includes a backflow preventer before the water makeup valve, and a separate boiler-mounted valve is labeled as a pressure reducing valve.

Components

high-efficiency boiler combustion air intake exhaust vent expansion tank air separator circulator pump hot-water supply piping return piping makeup water supply plumbing backflow preventer water makeup valve pressure reducing valve condensate drain