1 pipe system?

[macka09]

Hi all. What's the easiest way of identifying a one pipe heating system?

 

[stani]

Flow and return teed into same pipe, possibly tboe for the valves

 

[macka09]

Tboe?? I'm asking incase there's a clue or sign before having to lift the boards.

 

[mfgs]

tboe is top, bottom, opposite entry. That's not always the case with a one pipe though. You are going to have to pop a board and have a look really.

 

[stani]

Yeah, that's why I said possibly, but as Mfgs says you'll have to pop a board

 

[macka09]

Ok thanks for that. I appreciate it.

 

[jonnyswamp]

If the rads are fed by drops, then its probably a 2 pipe
A one pipe is generally a ring main right around the house with short tails up into the rad valves, which are usually all lockshields
However, that's not to say there wont be any exceptions

 

[Chalked]

Flow going upstairs and appearing as a return from downstairs.
Old imperial copper.
There are a few clues, but best take a board up or two to confirm.

 

[zzzjim]

Most of system in same size pipe ? ( Skinny bits is a No No )