New Radiator Size Issue

[Samwh91]

I have bought new radiators to replace my current ones (around 25 years old). Old radiators were all fitted with TRV's.

I have put the new 15mm compression inserts into the radiator that came with the new valves/TRV's but this then makes the valves too wide to fit onto the existing pipes (by around 20mm). I think the old radiators had the inserts that have to be put in with a radiator valve key.

Do the threaded parts of the radiator that the inserts screw into come up different widths on different brands?

 

[ShaunCorbs]

any chance of a pic of the new valves?

 

[Riley]

Are you saying that your valves are 3/4” male and the inserts are 1/2” female

 

[Samwh91]

These are the valves/TRV (Drayton RT212).

 

[ShaunCorbs]

https://www.NoLinkingToThis/p/chrome-angled-radiator-valve-drain-off-15mm-x/70408

 

[Samwh91]

https://www.NoLinkingToThis/p/chrome-angled-radiator-valve-drain-off-15mm-x/70408

I did buy a valve like this which did bring one side closer to the pipe however still don't have enough room to fit the TRV on the other side of the rad.

 

[ShaunCorbs]

Time to re jig and put a set into the pipes

 

[Samwh91]

Time to re jig and put a set into the pipes

Is there a TRV with the same style connection as this valve or are they all the compression style now?

As all the old rads had TRV's i assumed new radiators of the same size would fit straight in.

 

[Riley]

Show us a pic of your set up

 

[Mrb]

Yep.

Antares TRV with 3/4" Union Connection to Tail

 

[OffshoreGas]

Easiest option is probably to take the rad you’ve bought back and buy one slightly smaller and some telescopic radiator tails.

 

[Samwh91]

Ok thanks for all the replies. Looks like getting small radiators with the tail extensions will be the best option. Pipes are in a concrete floor as well which is more difficult as there is no movement on them.

Cheers for the help.

 

[OffshoreGas]

Ok thanks for all the replies. Looks like getting small radiators with the tail extensions will be the best option. Pipes are in a concrete floor as well which is more difficult as there is no movement on them.

Cheers for the help.

If you own a pipe cutter the one on the right is less likely to leak than the one on the left.

Getting the thread to seal in the radiator can be a bit of a pig if you use PTFE. £20 for a bottle of Loctite 577 even if it’s only for this one job may well save you a lot of hassle in the long term.

 

[Ben-gee]

If you use a pipe cutter on that chrome it will break the cutting wheel. Better to use a hacksaw (or if you’re brave/mad/have a vice use an angle grinder)

 

[king of pipes]

You can trim the rad tail insert down 8mm off each one may just get it I did it Friday and it worked worth a go seems you have them now . Kop

 

[OffshoreGas]

If you use a pipe cutter on that chrome it will break the cutting wheel. Better to use a hacksaw (or if you’re brave/mad/have a vice use an angle grinder)

The ones I’ve had that are just pipe stubs have just been chrome plated copper. May well be that not all are.