My system is gas. They needed to do this when they installed the new unit but they failed to cut the main and reroute the water in a way to create a continuous flow. Instead they just added two lines from the main creating a dead end.

HEATER
L l
L l
L l
_______________________l_________l________________ ____________
Main line from furnace no break to furnace

How big of a job will it be to cut the main and place elbows to establish a continuous flow through the new heater? I will need to sweat new joints. I don't want to empty the whole system. Then how do I refill it?

Hey schryk:

Need to know how old the system is? Need to know how many zones? Need to know what kind of pipe we're dealing with and if possible, what size pipe. Is the pipe a black metal or a copper pipe.

Answer all questions so I can help best!

MARK