TRV's

ith

I replaced all my TRV's with Danfoss ones a little while ago. My rads were the same as yours with the larger nuts. It was not a problem though as the Danfoss TRV's came with replacement inserts to screw into the radiator - the larger bits that were already in the radiators just got thrown away.

These are the valves I used:-

These are the valves I used:-

so you might have to do a bit of rejigging to the pipework, depending on how much "slack" you have.

I'm probably going to be a lone voice here, but TRVs haven't really worked out for me, this house and how it is used. Setting up several zones has worked out far better.

Problem was that the TRVs were often left set high when the room was unoccupied - heating the rooms unnecessarily. I guess I just don't have the discipline to check or change them as often as is needed...

Now I have a controller with 20 preset plans - which covers most eventualities. I just select the appropriate plan when things change, leaving the TRVs set to "fairly high".

Of course, YMMV. This is a big house and the number of people here varies a lot - just me at the moment, but not for long, there will be 17 staying here, come Easter. Afterwards I'll probably be more thinking of collapsing in a heap, rather than going around shutting off radiators. But, now, I don't have to. I just press a couple of buttons.

Also I have heard that the room where the thermostat is should have a TRV, is this correct?

no, the room with the room stat should not have a trv as per building regs

OP here, my mistake that's what I meant to type.

Cheers

John

In article , Palindrome writes

What kind of controller have you used?

A Homation X10 3000.

-- Sue

Thanks, I've found links to the 2000, all leading to

Do you have any links for further info or UK sellers?

Sorry, Nope. I bought it from a store in the USA, Home Depot IIRC, together with a load of X10 stuff. I had to convert it all for 240v, but it was still far, far cheaper than anything similar in the UK.

Should have bought more :(

-- Sue

Thanks all the same

If you have a gravity feed heating system (with a separate header tank for the central heating top-up) then there is no need to drain down. I put TRV's on all my rads (bar one) without draining down at all. I just used those plumber's rubber bungs to create a vacuum in the system. You insert one into the outlet pipe from the central heating header tank and one into the expansion pipe from the boiler (the one that curls over and hangs over the CH header tank). Once those pipes are bunged up you can remove a radiator, bleed off a bit of water to release the pressure and create the vacuum, and then you can cut off the old valve and replace it with a TRV without any loss of water. Works a treat. This wont work, of course, with a pressurised system.

Kev