adding modine unit heater to steam system with radiators

mark_47

I am considering adding a modine steam unit heater to a system with radiators. Main is pitched away from boiler with a return line looping back from end of line. How should i pipe unit heater (one or two pipe and with or without trap if two pipe

Steamhead

Two-pipe, no trap

Put a vent on the return side of the Modine, and run the return line into a wet return below the waterline.

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