New radiator pipe work - 10mm system. Can I use 15mm for just one room?

531063

I asked a heating engineer about this a while ago, he said be careful as it could put the pump in the boiler under added pressure

grumbler

531063 said:

I asked a heating engineer about this a while ago, he said be careful as *it* could put the pump in the boiler under added pressure

What exactly?

Using 15mm instead of 10mm? Obviously no.

Adding an extra 10mm loop? Again, no - obviously.

In both cases the pressure can only drop. The flow can slightly rise, but, if needed, it can be adjusted with lockshield valves.

ThisIsWeird

Microbore systems are commonplace. What's more, with TRVs, a reduce flow/increased resistance is exactly what happens. A pump ain't going to suffer.

markin

I think i would just extend the 22mm out if its going to feed the room below one day? And if a heat pump is one day on the cards it would all need to be replaced anyway with 22mm/15mm.