Issues with 22mm piping??

[jtsplumbing]

I know that this may be a shot in the dark BUT has anyone checked that the boiler is working correctly ? and that the pump is ok ? how old is the boiler ?

 

[Ben Miners]

So when I turn off the rads upstairs you can get heat going to the new rads, so does this mean that the piping size is the issue as suggested by the plumber??

 

[ShaunCorbs]

All the new rads heat up ?

I would say it's a balancing or pump issue

 

[Ben Miners]

could it be possible that the new rads are too big for the system...ie btu output? I was just thinking the system worked fine before on standard rads

 

[ShaunCorbs]

could it be possible that the new rads are too big for the system...ie btu output? I was just thinking the system worked fine before on standard rads

Noo won't be too big and they look about right tbh

 

[sammathias]

I would say as all the pipework is in screed its all 15mm as you have probably guessed. new combi fitted onto existing pipework? you say you turn off rads upstairs and new rads heat up....is there any pipework visible in airing cupboard or anywhere...could be an old gatevalve open acting as a bypass!! could just need balancing,doesnt sound like an airlock. pressure on boiler good?

 

[sammathias]

that isolation valve on the return to the boiler before the filter fully open?? test the boiler on chimney sweep.

 

[Selectsands]

Ok guys so correct me if I’m wrong but firstly just connecting 22mm pipework to already 15mm pipework will do nothing to improve the heating up of those new rads. And secondly surely if the proposal of a new 22mm flow and return straight from the boiler to the new radiators would cause some tricky balancing of the rest of the house. ?? As Scott said it would be better for those rads to have been piped in 15mm straight off the 22mm flow and returns.

 

[gmartine]

Those rads were originally piped from 15mm branched from 22mm until they were changed. Like to know if turning off the other rads worked, turn the CH on max and are you sure the hive system is set up correctly?