Side arm heater

Heating · Distribution Systems · printed page 156 (PDF page 157)

Book index entries

with Sidearm Heater Hot Water – with Sidearm Heater Hydronic Heating – with Sidearm Heater Sidearm Heater on Hot Water System

Text in the illustration

like a tankless coil, a side arm heater uses the hot boiler water to heat water for the supply plumbing
side arm heaters, however, are mounted outside the boiler
hot water from the boiler is drawn across the side arm coil and then returned to the boiler
domestic hot water
domestic cold water
hot water
cold water return
circulating pump
boiler
pressure relief valve not shown

Generated explanation

The diagram depicts a hydronic boiler with an externally mounted side arm heater for domestic hot water. Hot boiler water flows from the supply piping through the side arm heater, across the domestic-water coil, and back to the boiler return. Domestic cold water enters the bottom of the coil and exits as domestic hot water at the top, separate from the boiler-water circuit. Red and blue piping and directional arrows distinguish the hot supply and cooler return paths. An expansion tank connects to the hot-water piping, and a circulating pump is installed on the boiler return; an annotation states that the pressure relief valve is not shown.

Components

boiler side arm heater domestic-water heating coil expansion tank circulating pump hot-water supply piping boiler return piping domestic cold-water piping domestic hot-water piping valves

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