Combination high-efficiency boiler with multiple loops

Heating · Pulse Combustion · printed page 160 (PDF page 161)

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Boiler – Combination with Multiple Loops Combination High Efficiency Boiler with Multiple Loops

Text in the illustration

radiant zone 1
radiant zone 2
radiant zone 3
pumps
manifold
domestic cold water
tempering valve
secondary loop
pump
to 3 heating zones with radiators
zone control valves
domestic hot water
from 3 heating zones
primary loop
pressure relief valve
condensate drain
temperature/pressure relief valve
boiler
indirect water heater
simplified for clarity
note: check valves may be needed to prevent reverse flow

Generated explanation

The schematic depicts a high-efficiency boiler serving multiple hydronic heating loops and an indirect domestic water heater through primary-secondary piping. Three radiant heating zones have individual pumps and shared supply and return manifolds, while another secondary loop connects to three radiator zones with zone control valves. A pumped secondary loop circulates boiler water through a heat-exchanger coil inside the indirect water heater. Red and blue piping and directional arrows distinguish heated supply and cooler return flows; domestic cold-water connections and tempering valves are also shown. The boiler has a pressure relief valve and condensate drain, and the water heater has a temperature/pressure relief valve. A note states that check valves may be needed to prevent reverse flow.

Components

high-efficiency boiler primary hydronic loop secondary hydronic loops circulator pumps supply manifold return manifold radiant heating zone piping zone control valves tempering valves indirect water heater heat-exchanger coil domestic cold-water piping domestic hot-water piping pressure relief valve temperature/pressure relief valve condensate drain expansion tank