Hello all,
As you can probably tell I'm an absolute novice and I've already broken the golden rule of forums by not searching first but I have to go to work in a few minutes.
I have a gravity feed+expansion boiler system with a hot water tank and a non-condensing boiler that's probably circa 1993 as that's when the house was built. All the radiators have unregulated lockshield valves on both sides. I want to replace them with TRVs probably next year when it's a bit warmer to drain the system (except for the towel rail, also there is a manual bypass pipe in the airing cupboard so I should be able to put TRVs in all the rads) but on looking online I find different sizes and I don't know which to get.
e.g. looking at the Drayton TRV4 its available as 8mm, 10mm, 15mm, 1/2", 3/4". How do I know which to get, is it the pipe size? Measured with calipers the pipes to the rads are somewhere between 10.5-11mm outer diameter with some paint on them.
Cheers,
Matthew
As you can probably tell I'm an absolute novice and I've already broken the golden rule of forums by not searching first but I have to go to work in a few minutes.
I have a gravity feed+expansion boiler system with a hot water tank and a non-condensing boiler that's probably circa 1993 as that's when the house was built. All the radiators have unregulated lockshield valves on both sides. I want to replace them with TRVs probably next year when it's a bit warmer to drain the system (except for the towel rail, also there is a manual bypass pipe in the airing cupboard so I should be able to put TRVs in all the rads) but on looking online I find different sizes and I don't know which to get.
e.g. looking at the Drayton TRV4 its available as 8mm, 10mm, 15mm, 1/2", 3/4". How do I know which to get, is it the pipe size? Measured with calipers the pipes to the rads are somewhere between 10.5-11mm outer diameter with some paint on them.
Cheers,
Matthew