Old Radiators - New TRV's

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That looks to me like a 1 pipe setup ! and the original rad looks like a 1960's one . If you have a wood ground floor - lift a board or 2 and you'll probably find hair felt lagging . If I was still installing I'd rip the lot out and have a complete new setup to go with the new boiler. You can get TRV's for 1 pipers but look @ the cost :notworthy:
 
No, its flow and return. Picture 1 and Picture 2 are the radiator.

I had the rad off tonight, the valve key thing that I picked up from Screwfix is too big. I get what its for now, anyhow its no good.

Ive cleaned the rads out with a hose pipe, a lot of sludge came out which was good. Ive filled and drained it a few times, the new boiler goes in on a week Saturday.

20150713_182331.jpg
 
Sadly this boiler does not cut it anymore.

It takes ages to heat the rads, there are 9 rads in the house, 4 bedrooms, 2 bathrooms, lounge, study, dining room, kitchen etc. The house had an extra bedroom in 2006, the heating was not upgraded just extended.

This is why we need a combi, the hot water tank it too small, the water goes really quickly and therefore a 30Kw boiler is needed.

20150713_202914.jpg


Note - Flow and Return pipes from the Pump (upstairs) in 15mm, boiler flow and return in 27mm..
 
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To have a two pipe system you would find, for each radiator, one end "teed" of one circulating pipe and the other end "teed" of a different, but usually parallel, pipe. A one pipe system will have both ends of the radiator teed of the same pipe, but of course one end of this single pipe will be the flow from the boiler and the other end the return to the boiler.

I'd seriously recommend you get someone in to inspect your system and give you a definitive answer as to the type of system you have before committing to spending much money on it.
 
Nige,

I do appreciate the replies and the help from the Forum, there comes a point when people just dont read what you put, despite the pictures.

It clearly is a flow and return system, its 2-pipe.

I have even had a plumber around, looked at the system, provided me with a quote and is coming on 1-week Saturday to install the Combi.

If you dont believe me now, you can come and have a look.
 
Of course you will see a flow and return at the boiler, even if it is a one-pipe system. That's what you're not grasping.

Seen people install a combi on a one-pipe system many times and void the warranty immediately!
 
Many questions to be considered which is why an experienced plumber can be useful!

Many new TRVs and lockshields have a little sideways adjustment of about 10 mm to help. But not all valves have the same width!

I would always recommend liquid filled TRVs and personally mostly fit the TRV4.

With a new condensing boiler a greater heat output will make it more efficient and replacing the rads with finned ones would be a god idea!

Tony
 
Hi Agile,

I spotted MrCentralHeating has some TRV4 clones, they are liquid filled for about £9 just for the TRV, the lock-shield obviously is extra therefore closer to £12 for both.

The labour to change over a rad, a 1840mm x 420mm to a 900mm x 600mm single is £50. We will supply the rad, its either from MrCentralHeating at £33 plus TRV, or £38 with Drayton (non-liquid) TRV from Screwfix.

I had 2 of the old rads off last night to clean them out, the sludge in them was pretty bad. 5 mins with the hose pipe, and they are pretty clean.
 

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