Side arm heater

Plumbing · Combination Systems · printed page 282 (PDF page 283)

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Plumbing

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
exhaust flue
hot water
cold water return
domestic hot water
domestic cold water
circulating pump
boiler
pressure relief valve not shown

Generated explanation

The illustration shows a side arm domestic water heater mounted outside a hot-water boiler. Hot boiler water passes through the external heat exchanger around a coil and returns to the boiler return piping. Domestic cold water enters the coil at the bottom, is heated by the boiler water, and exits as domestic hot water at the top. Red and blue piping and arrows distinguish the hot supply and cooler return flows. The assembly also shows a circulating pump, an expansion tank, an exhaust flue, and piping valves; a note states that the pressure relief valve is not shown.

Components

boiler side arm heater heat exchanger coil domestic cold water piping domestic hot water piping boiler hot water supply piping boiler return piping circulating pump expansion tank exhaust flue piping valves

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