"Piggy back" an existing rad

[jc69817]

Hi guys. I'm looking to fit a rad in my living room. There is one in the hall directly behind where I want the new one. Is it a simple matter of teeing from the old to the new and if so does it matter which pipe is which.

Cheers guys

 

[dilalio]

Hi guys. I'm looking to fit a rad in my living room. There is one in the hall directly behind where I want the new one. Is it a simple matter of teeing from the old to the new and if so does it matter which pipe is which.

Cheers guys

That's fine. Just make sure to tee off the flow and return and connect new rad to both. If using a TRV on the new rad put it on the side which will get best reading of temp in the room and it should be bi-flow/directional so that it can be on either inlet or outlet of rad.

 

[jc69817]

Cheers pal. Appreciate that.

 

[bazdaman]

What size pipe is at the hallway rad? If its 10 mm then i certainly would NOT tee into it

 

[jc69817]

The pipe in the hall is either 10 or 8 not measured it yet. Is there a reason not to tee from it or is it just personal preference ?

 

[sooey]

Smaller pipes can't carry as much water/heat, though if it's 10mm you should be alright to feed two rads off it providing they aren't massive.

 

[muggles]

10mm has a small heat-carrying capacity so you might end up with two cold rads. Best to go back to where the main runs are, which might be a manifold, in which case you'll need to find the manifold and connect to that

 

[dilalio]

Try the smaller job first then, if the rads don't deliver, do the bigger job... Simples

 

[Plumber90]

If they are 10mm or smaller I would be shocked if it works properly.

 

[dilalio]

If they are 10mm or smaller I would be shocked if it works properly.

Depends on many variables... Size of system; size of rads; distances; cleanliness of system water; proximity/bore of primary circuit/manifold; boiler efficiency; pump; valve quality; bends 'n' elbows etc etc...