SWMBO has asked me to swap our rad valves to TRV's. I have no problem in
draining down and refilling etc. All the TRV's I have seen in the past have
15mm compression nuts on both ends, my rad vales are similar to these
and have a large nut on the radiator to screw to the valve. Can TRV's with
tis thread be obtained? If so from where? I do not want to have to do any
pipework rejigging so would like a straight swap out if possible. Also I
have heard that the room where the thermostat is should have a TRV, is this
correct? Also doing this job would give me an ideal opportunity to get the
rads outside and give them a flush out with a hose.
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:-
Thanks for the quick answer Steve. What is the other component in your
picture? Does that replace the lockshield? Is that component necessary?
As fat=r as I can tell this is the same valve but without that part.
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.
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 :(
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.
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