two pipe to mono flow

kev

I am looking at a three family house where the owner wants to split the heating system and supply the apartments with separate boilers. The two pipe mains run around the basement and each set of risers to the rads are accessible. He wants me to fish baseboard around each apartment. I proposed to leave all existing rads and pipe three separate mono flow systems. None of the rads are more than 12,000 btus so I plan to feed each with 1/2" off the mains. Each apartment is under 40,000 btu load. Can I safely run my mains in 3/4" tube? The boilers will be 50,000 btu output do I need a by-pass on the return? Thank you for any input.

Rodney Summers

He'd probably be a lot happier

if he simply left the rads in place and let you repipe them according to floor/tenant. Unless a riser is "siamesed" (feeding rads on two floors from a common riser).

Using a 007 for each system you can run 3/4" trunk with 1/2 take-offs, provided the total circuit length, using 12' of length adder for each monoflo tee, doesn't exceed ~ 180'

The bypass would be for.....? To protect a non-condensing boiler?

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kev

yes

I plan on using non-condensing boilers.