Two-pipe system (direct return)

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Book index entries

Hydronic Heating – Two Pipe System – Direct Return Two Pipe System (Direct Return) on Hot Water Heating

Text in the illustration

radiator
supply pipe
return pipe
hot water
cool water
expansion tank
boiler
cross section

Generated explanation

A building cross section shows a two-pipe, direct-return hydronic heating system with a boiler below two radiators. Red supply piping carries hot water from the boiler to each radiator, while blue return piping carries cooler water back to the boiler. Arrows indicate flow direction through the supply and return branches. The nearer radiator has a shorter combined supply-and-return path than the farther radiator. An expansion tank connects to the piping above the boiler.

Components

boiler radiators hot-water supply piping cool-water return piping expansion tank radiator valves circulator pump