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Difference in quality of TRVs

Discussion in 'Plumbing and Central Heating' started by Avocet, 31 Aug 2010.

  1. Avocet

    Avocet

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    I need to replace some TRVs on my central heating system before the winter. Looking online I notice that the price seems to vary enormously! I can pay anything from about £7 each to about £40! Is there any appreciable difference in quality? I notice some are wax and some are liquid sensing. some seem to be EST approved. Some are complint with BS 2767-10 and others to EN 215.
    Also, most seem to be 15mm angled. All mine are angled, but is there any way I can tell if they're 15mm? System is about 15 years old.
     
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  3. looneyfitter

    looneyfitter

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    Same old same old i think.. You get what you pay for. Drayton TRV 4's are v good.

    Sounds daft but is the pipe about the same width as you little finger?
     
  4. Threadjacker

    Threadjacker

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    I normally fit Pegler Terriers, they are plenty good enough.

    Just measure the width of the pipe going into the rad valve, if will be 15mm, 10mm or 8mm.
     
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  5. Avocet

    Avocet

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    Thanks both. The outside diameter of all the pipes that come up from behind the skirting boards and into the bottoms of the valves is just over 10mm - typically 10.5mm (but they have been painted). However, the very short length of pipe that comes out of the TRV and into the union on the bottom of the radiator is 15mm! The unions are both 24mm "spanner size" if that makes any sense?
     
  6. mickyg

    mickyg

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    liquid sensor trvs react much quicker to changes in room temperature and are generally more accurate. If you use trvs "properly"(ie setting them and leaving them) then these are the ones to go for. If you have a woman in the house constantly turning them up and down then dont waste your money and go for a cheaper wax one.
    I generally use Danfoss C2, as they are a well priced liquid sensor valve and good quality. The D2 is the same but better finish. Drayton TRV4 are also good but I think they're overpriced due to their popularity.
    For wax sensor valves as above the terrier ones are reliable and decent and can be bought cheaper from plumb center rebranded as "bulldog trv". Honeywell valves are also good quality wax sensor valves.
     
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  7. tamz

    tamz

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    Go for the Danfoss Ras-C or or bit more expensive D's. IMO they are the best valves on the market. You can get combo packs which include a lockshield for around a tenner.
     
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  8. Paulus996

    Paulus996

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    Are there any manufacturers who make thermostatic rad valves which mate with the old style valve tails?
    The reason I ask is that I am currently changing my Boiler and while the system is drained I will replace some of the rad valves with the thermostatic type.
    I have looked at a few different makes though and they all seem to have a different type of fitting where the valve fits to the tail coming out of the radiator, i.e. they look like a standard 15mm compression fitting with olive. The type currently fitted have a much larger nut and have a radiused end which pulls up to the valve.
    I know the new valves have the tails included but it would be a much longer job if I have to remove the radiator just to fit the 'new' type of tail.
    Any ideas?
     
  9. tamz

    tamz

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  11. roguetrader

    roguetrader

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    you dont need to remove the rad to change the tail. they dont take long as long as the rads not badly corroded.
     
  12. Whitespirit66

    Whitespirit66

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    Yes, Danfoss RAS C2. They're just over a tenner each if bought in packs of 5 from screwfix. They're what I always fit. Sounds like these are the size you need -

    http://www.screwfix.com/app/sfd/cat/products.jsp?id=33140&ts=21450

    Don't be tempted by cheap stuff with names you've never heard of. Always either Danfoss, Drayton, Honeywell, Pegler.
     
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  13. mehran

    mehran

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    i know this may sound petty but i think that danfoss TRV is fugly looking :LOL:

    i use "BOSS Supreme Plus" which i think a Peglar valve out of PTS. like the look of them...
     
  14. tamz

    tamz

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  15. Paulus996

    Paulus996

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    Problem is though that I won't find that out until it's too late :( . The new tails are also longer so could cause a problem where there is not much movement in the pipework. You'd think that someone would make a TRV which would fit straight off, especially when there must be a huge market of people retro fitting them to older systems.
     
  16. mrgas

    mrgas

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    Ive seen a fair few broken heads off the drayton 4 recently......
     
  17. transam

    transam

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    In my view ?? apart from the look of them , & wether or not they stay water tight , there probably isn't much difference between them ! I doubt wether one works any better than any other , althogh we did use to fit an ACL type that were supposed to be multi directional , & on some sealed systems it did not prove to be correct !
     
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