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drewhart 01-13-2009 08:45 PM

hooking up a boiler
i want to replace my boiler with another used one. the one i have now is very old, and the water lines comming out of it are very large (3-4" diameter) steel lines. the one i want to buy had 2" copper lines comming out. what is involved in hooking this up to the large steel lines i have now?

beenthere 01-13-2009 09:20 PM

Big reducing couplings.

biggles 01-13-2009 09:24 PM

you can get reducing adapters that are copper and thread them onto the exsisting 4" ans then pipe into the new boiler with copper from the 2" side of the adapter.....check HD for fittings........exsisting 4" lines :eek:are your running steam or HW for heating

JohnH1 01-13-2009 09:28 PM


Originally Posted by beenthere (Post 212305)
Big reducing couplings.

Thats funny!!! I needed that

drewhart 01-13-2009 10:07 PM

yes its a hot water system.

beenthere 01-13-2009 10:13 PM


Ok, they reducing bell couplings.

I use cast iron ones.
Using copper female adapters on pipe that large can present small leaks problems when the system comes up to temp.

Guessing his system was gravity at one time.

drewhart 01-13-2009 10:27 PM

so does the copper sweat into the cast iron bell coupling?

beenthere 01-14-2009 05:28 AM

You would use a male adapter.

It has a threaded end for screwing into cast/steel fittings, and a sweat end for copper to copper connections.

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