Recessed radiator valve is higher than old radiator.

gm4533

Hi, I just replaced my recessed radiator with a bigger one for more BTUs. The issue I'm having is that the new 12 section sunrad radiator has the connection about an inch higher than the 10 section one and this is creating a 1 inch gap to the connection pipe coming through the floor. I have pictures attached to show you what I mean. Is there anyway I could get an extension to mate the two pipe without removing the floor to change the piping?

Waher

A union with a close nipple maybe. Is the rad on top of the carpet or the floor beneath?

gm4533

The radiator is on top the carpet. I replaced the carpet padding with 7/16" thick wood blocks where the legs sit.

pecmsg

What's below?

Jamie Hall

https://forum.heatinghelp.com/discussion/comment/1838917#Comment_1838917

This. And you may find you actually need to raise the radiator slightly to get it all to fit.

However, before you start to do that, are you sure that the pipe in the floor didn't drop some when you removed the old radiator? Very sure? Any way to find out if you can lift that pipe? Because… if it dropped the part under the floor may have too little pitch or even be reverse pitched, which will cause water hammer…

ethicalpaul

https://forum.heatinghelp.com/discussion/comment/1838921#Comment_1838921

Well there's at least 7/16 closer you can get. I second what Jamie said just above about the possibly dropped pipe

Intplm.

Pluck the union nut up from the carpet with a screw driver or putty knife and pull, turn it on to the threads of the valve. Im thinking it should be as easy as that. If you have access from below get some help and push it up.

delcrossv

Anvil does make extensions just for this.

Google Anvil 1138 extension.

gm4533

I put the radiator on blocks because if the radiator sinks too much into the carpet I won't be able to fit the bottom cover.

As for what's under the carpet. The flooring under the radiator is just plywood because the 100 year old hardwood gave out in that area. The area where the heating pipe is there's a 12" x 24" piece of plywood that i can remove to access that pipe if I really need to alter it. It's just that I installed new carpet in that room and I would have to pull it up.

Intplm.

https://forum.heatinghelp.com/discussion/comment/1838961#Comment_1838961

^^^^^^^^^^^^^^^^^ THIS ^^^^^^^^^^^^^^^^^

gm4533

Intplm, I actually have access to the pipe from the basement. The pipe runs through a notch in the joists, I cant push it up any.

gm4533

Can I unscrew that union coming from the floor and install a longer union?

Jamie Hall

Let's go back to square one here.

Now that I really look at this, that is a union coupling, not a threaded joint.

You cannot add an extension to the piece coming up from the floor. Period. That is half of the union, the other half is on the valve.

The ONLY way to do this is to lift that pipe up to meet the valve and screw the union together. The only other option would be to access the piping from below and add a short extension between the pipe itself and the union.