Lin Posted April 5, 2018 Share Posted April 5, 2018 (edited) My potential plumber has quoted to do the lot includeing all the underfloor heating. I asked him what pipe he proposed and he said 'John Guest'. Any comments about this brand? Or what may be a better option or are they all about the same ? their guarantee is 'only' 25 years. he says it's quality gear. The lay flat video shows that it is very easy to lay ... maybe that is why he is so keen? Edited April 5, 2018 by Lin Link to comment Share on other sites More sharing options...
PeterW Posted April 5, 2018 Share Posted April 5, 2018 Pipe is pipe - ask him what manifolds he is planning to use as thats the killer question. Most of the newer pipe lays flat anyway -JG is a bit pricey but the off cuts can be used for plumbing afterwards unlike the 16mm standard PEX stuff that needs converters. 1 1 Link to comment Share on other sites More sharing options...
Lin Posted April 6, 2018 Author Share Posted April 6, 2018 Thanks for your reply Peter As the pipe cannot be easily replaced once under a screed and will be there for a very long time, it does concern me more. He will use John Guest manifold Link to comment Share on other sites More sharing options...
8ball Posted April 6, 2018 Share Posted April 6, 2018 A general builder just across the street from me has just installed JG pipe in his own house for underfloor heating, hes been in the trade for years and really knows his stuff. The house is not a flip he plans to stay for years so I should think he wanted the best for the UFH. I ended up using JG for heating and water and have had no problems at all. If I see him over the weekend I'll ask what manifolds he used. 1 Link to comment Share on other sites More sharing options...
Alexphd1 Posted April 6, 2018 Share Posted April 6, 2018 I have went the other way, a cheap manifold with a grundfos pump and branded pipe. Not a big fan on JG speed fit, prefer the old grey hep2o stuff for plumbing, not used either for a few years. We have used 12/16 & 20mm uponor mlcp for our build. 1 Link to comment Share on other sites More sharing options...
Triassic Posted April 7, 2018 Share Posted April 7, 2018 (edited) I am going in the opposite direction, cheap ebay Pex pipe £45 per 100m, after all it’s buried in concrete and is protected, so is very likely to leak. Edited April 7, 2018 by Triassic 1 Link to comment Share on other sites More sharing options...
Onoff Posted April 7, 2018 Share Posted April 7, 2018 8 minutes ago, Triassic said: I am going in the opposite direction, cheap ebay Pex pipe £45 per 100m, after all it’s buried in concrete and is protected, so is very likely to leak. Likely? Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 13 minutes ago, Triassic said: after all it’s buried in concrete and is protected, so is very likely to leak. Lol . 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 On 05/04/2018 at 23:07, Lin said: My potential plumber has quoted to do the lot includeing all the underfloor heating. I asked him what pipe he proposed and he said 'John Guest'. Any comments about this brand? Or what may be a better option or are they all about the same ? their guarantee is 'only' 25 years. he says it's quality gear. The lay flat video shows that it is very easy to lay ... maybe that is why he is so keen? What insulation and thickness? What screed / concrete and thickness? Heat source? Hold off choosing the manifold because it's going to be decided by the floor construction and heat source / type ( not by your plumber ) Link to comment Share on other sites More sharing options...
Triassic Posted April 7, 2018 Share Posted April 7, 2018 9 hours ago, Triassic said: I am going in the opposite direction, cheap ebay Pex pipe £45 per 100m, after all it’s buried in concrete and is protected, so is very likely to leak. Woops, I meant to say unlikely to leak !! 1 Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 5 minutes ago, Triassic said: Woops, I meant to say unlikely to leak !! That one is staying . Link to comment Share on other sites More sharing options...
Triassic Posted April 7, 2018 Share Posted April 7, 2018 10 hours ago, Nickfromwales said: Hold off choosing the manifold because it's going to be decided by the floor construction and heat source / type ( not by your plumber ) Could you expand on this as I need to buy my manifold. My floor is concrete and the heat source is a thermal store and ASHP. Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 You'll be better off with a capillary probe / blending type then, rather than a traditional TMV. Check out the Ivar Dualmix for eg. Link to comment Share on other sites More sharing options...
Lin Posted April 7, 2018 Author Share Posted April 7, 2018 13 hours ago, Nickfromwales said: What insulation and thickness? What screed / concrete and thickness? Heat source? Hold off choosing the manifold because it's going to be decided by the floor construction and heat source / type ( not by your plumber ) 75mm PIR (limited headroom) Prob liquid 45 to 75mm, as current floor is sloping Gas Link to comment Share on other sites More sharing options...
PeterW Posted April 7, 2018 Share Posted April 7, 2018 On 06/04/2018 at 09:29, Lin said: Thanks for your reply Peter As the pipe cannot be easily replaced once under a screed and will be there for a very long time, it does concern me more. He will use John Guest manifold There are better and cheaper options ..! I would go Pert/PEX and the Ivar manifold as per the recommendation from @Nickfromwales or a full set from Wunda Trade Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 10 minutes ago, Lin said: 75mm PIR (limited headroom) Prob liquid 45 to 75mm, as current floor is sloping Gas You'll need a buffer tank. You'll also need a manifold that does not rely on a cool / cold return to blend the UFH flow temp. See my last for the type of manifold you'll need. Choose your controls VERY wisely as you'll need a narrow hysteresis to regulate heat output with a thinner screed / slab, otherwise you'll be going hot / cool / hot / cool.....instead of staying 'warm'. Link to comment Share on other sites More sharing options...
Lin Posted April 7, 2018 Author Share Posted April 7, 2018 I can't see buffer tank on the quote ...how big are they ?? There is something called an automatic bypass, and also manifold and on another page; "install manifold and control system under boiler location" which could mean anything Link to comment Share on other sites More sharing options...
Lin Posted April 7, 2018 Author Share Posted April 7, 2018 5 hours ago, Triassic said: Woops, I meant to say unlikely to leak !! I have a distrust for pipe because in the past it has had a bad rep as it degraded over time and did leak for some people. It didn't like getting too hot, also certain metals it did not like .... either copper or iron ... i can't remember now. Nick will know Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 1 hour ago, Lin said: I have a distrust for pipe because in the past it has had a bad rep as it degraded over time and did leak for some people. It didn't like getting too hot, also certain metals it did not like .... either copper or iron ... i can't remember now. Nick will know I know little or nowt. Mostly nowt, occasionally a bit. Sometimes the bit is relevant to nowt and has little use. Apart from that, I'm your man. Link to comment Share on other sites More sharing options...
Nickfromwales Posted April 7, 2018 Share Posted April 7, 2018 1 hour ago, Lin said: ... i can't remember now. Nick will know I know little or nowt. Mostly nowt, occasionally a bit. Sometimes the bit is relevant to nowt and has little use. Apart from that, I'm your go to guy. Link to comment Share on other sites More sharing options...
PeterW Posted April 7, 2018 Share Posted April 7, 2018 10 minutes ago, Nickfromwales said: I know little or nowt. Mostly nowt, occasionally a bit. Sometimes the bit is relevant to nowt and has little use. Apart from that, I'm your go to guy. I can vouch for his first statement .... Link to comment Share on other sites More sharing options...
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