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I ended up replacing the TRV's, there was enough "slack" in most pipe work under the floor as the new TRV's were smaller. Thanks for all the help.....

Boilerman2 - Can you let me know where you got them from please?

Sorry if I am being a bit dumb here! What's the standard size for the tail that comes with a standard TRV. I have fitted a few of these now and looking at pictures of the Danfoss RAS-D2 TRV's these look like standard sizes, i.e. exactly what I have now. Does anyone know a product code for...

Just looking online now at the RAS-D2 TRV's. I will order a couple up to to use if changing to the Siemens ones causes particular issues on some of my RAD's. Thanks all for your help, it's appreciated. Terry

Just had a look at my new TRV's (Siemens SFMTN51GB). Now the bolt on the old ones (the ones already in place as per pictures) is much larger than the bolt on the new ones. I would say at a minimum I will have to remove the "tail" (not sure if that's correct terminology), the bit that connects...

Hello, I need to replace 7 Danfoss TRV's on imperial sized rad's. I am not a plumber but can happily replace \ install standard 15mm TRV's. However the TRV's on the current rad's are not 15mm at the rad end and seem to have a converter in place to fit to the main heating pipework. I was...

:D Answerd my own question! Any advide on wireless room stat and a 5\2 or 7 day timer that would suit my system? Thanks, Terry

It's the one on the right. (the two port version and it's a Honeywell) And I need to correct my original information. I can turn the central heating off and just have the hot water on. The limitation of the programmer is that the on\off times refer be both the heating and hot water...

http://www.honeywelluk.com/Documents/All/pdf/936.pdf This is the design of system I have but there is NO room stat and it's NOT got any honeywell components. I am trying to understand if I can "simply" replace the Potterton EP 2000 controller with one that "allows" the hot water circuit to...

Dan, As you can tell I am no expert and am picking up what I can along the way. Terminology is getting the better of me here. There is an electronically controlled valve on the hot water circuit near the hot water cylinder. It controls the circuit dependent upon the temperature set by...

Dan, I think I have a "zone" valve (3 port moterised valve) on the feed from the boiler to the hot water cyliner. I think it's controlled via a cylinder temp stat. I assume this is to turn the hot water off when it reached the desired temp? The Potterton EP 2xxx and 3xxx range appear to...