Onoff Posted May 16, 2018 Share Posted May 16, 2018 3 hours ago, Triassic said: 300 metres for £127. So 43pence per metre. https://www.ebay.co.uk/itm/Underfloor-heating-pipe-PEX-AL-PEX-pipe-16mm-x-2mm-300m-rolls-WRAS-approved/122806677415?hash=item1c97d92fa7:g:tuoAAOSwy0JaCTeI Not knocking but deffo Chinese: http://vevor.m.manufacturer.globalsources.com/si/6008852403883/Showroom/3000000205896/32408/PEX pipe.htm Link to comment Share on other sites More sharing options...
Alexphd1 Posted May 16, 2018 Share Posted May 16, 2018 (edited) Regarding 15 v 16mm as mentioned above. No reason why you can't use 16mm mlcp for domestic water but probably will need to use standard compression fittings plus a adaptor. You also get them in chrome. Roughly £1 each. Edited May 16, 2018 by Alexphd1 Link to comment Share on other sites More sharing options...
PeterW Posted May 16, 2018 Share Posted May 16, 2018 6 minutes ago, Alexphd1 said: Regarding 15 v 16mm as mentioned above. No reason why you can't use 16mm mlcp for domestic water but probably will need to use standard compression fittings plus a adaptor. You also get them in chrome. Roughly £1 each. I think they are the wrong way round - that’s for putting 15mm pipe into 16mm fittings. Link to comment Share on other sites More sharing options...
Alexphd1 Posted May 16, 2018 Share Posted May 16, 2018 1 hour ago, PeterW said: I think they are the wrong way round - that’s for putting 15mm pipe into 16mm fittings. Better not be..... or I am buggered, lot of unhappy customers.. I have been using them to join mlcp to brass compression for last 15 years. 1 Link to comment Share on other sites More sharing options...
PeterW Posted May 16, 2018 Share Posted May 16, 2018 30 minutes ago, Alexphd1 said: Better not be..... or I am buggered, lot of unhappy customers.. I have been using them to join mlcp to brass compression for last 15 years. Yep my bad - they are different to the ones I've used as they only have the one O ring. 2 Link to comment Share on other sites More sharing options...
Alexphd1 Posted May 16, 2018 Share Posted May 16, 2018 We used to take the plastic pipe rite up to the trv on radiators on contract jobs and used the chrome fitting. It actually left a very tidy job. Link to comment Share on other sites More sharing options...
Onoff Posted May 16, 2018 Share Posted May 16, 2018 The 15mm copper to 16mm pex al pex elbows I've used: Link to comment Share on other sites More sharing options...
ProDave Posted May 16, 2018 Author Share Posted May 16, 2018 ^^ TP sell that adaptor and it fits any 15mm compression fitting, straight, elbow or tee. Link to comment Share on other sites More sharing options...
Onoff Posted May 16, 2018 Share Posted May 16, 2018 This was another 16mm pipe fitting: Link to comment Share on other sites More sharing options...
ProDave Posted May 19, 2018 Author Share Posted May 19, 2018 I have ordered this one in the end. https://www.ebay.co.uk/itm/Underfloor-heating-pipe-PEX-AL-PEX-pipe-16mm-x-2mm-240m-rolls-WRAS-approved/222978205413?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649 From a UK supplier claiming UK approvals. I will probably find it was still made in China Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 19, 2018 Share Posted May 19, 2018 On 16/05/2018 at 07:35, Triassic said: 300 metres for £127. So 43pence per metre. https://www.ebay.co.uk/itm/Underfloor-heating-pipe-PEX-AL-PEX-pipe-16mm-x-2mm-300m-rolls-WRAS-approved/122806677415?hash=item1c97d92fa7:g:tuoAAOSwy0JaCTeI No one likes a show off unless it's me . Link to comment Share on other sites More sharing options...
Onoff Posted May 19, 2018 Share Posted May 19, 2018 22 minutes ago, Nickfromwales said: No one likes a show off unless it's me . Looks like Dave has gone with the seller I got mine from, "esavep". The bonus is his will be connected and running long before mine is so I'll get a heads up on any issues! 2 Link to comment Share on other sites More sharing options...
ProDave Posted May 19, 2018 Author Share Posted May 19, 2018 My decision was slightly swayed by the fact all the sellers with the 300M rolls are currently out of stock. Link to comment Share on other sites More sharing options...
Nickfromwales Posted May 19, 2018 Share Posted May 19, 2018 1 hour ago, ProDave said: My decision was slightly swayed by the fact all the sellers with the 300M rolls are currently out of stock. You are SUCH a liar dave. We all know its because of the price. . Link to comment Share on other sites More sharing options...
Barney12 Posted May 21, 2018 Share Posted May 21, 2018 On 19/05/2018 at 19:42, Onoff said: Looks like Dave has gone with the seller I got mine from, "esavep". The bonus is his will be connected and running long before mine is so I'll get a heads up on any issues! Thats Earth Save Products. I don’t know if they still are but certainly at the time of my build that’s where MBC were sourcing their pex pipe. Link to comment Share on other sites More sharing options...
ProDave Posted May 21, 2018 Author Share Posted May 21, 2018 On 19 May 2018 at 21:15, Nickfromwales said: You are SUCH a liar dave. We all know its because of the price. . Actually no. In the end I paid the same price for a 240m coil as I was originally looking at for a 300m coil but I dithered too long and all the 300m ones had gone. Link to comment Share on other sites More sharing options...
MikeSharp01 Posted June 5, 2018 Share Posted June 5, 2018 (edited) Anybody got any ideas on the spacing between UFH pipes. Our slab is 150mm thick and I was going 300mm grid but I notice that 200mm is more usual in 16mm pipe? Also I see that for an ASHP driven system a 100mm spacing is recommended! Edited June 5, 2018 by MikeSharp01 Link to comment Share on other sites More sharing options...
joe90 Posted June 5, 2018 Share Posted June 5, 2018 Mine was designed by Wunda, using an ASHP and they specced 150mm centres! Link to comment Share on other sites More sharing options...
jack Posted June 5, 2018 Share Posted June 5, 2018 Ours is 200mm. You don't need ultra-close spacings if you're going low temp and have good insulation. Link to comment Share on other sites More sharing options...
PeterW Posted June 5, 2018 Share Posted June 5, 2018 ASHP 100mm spacings is for standard build houses where you don’t have a buffer and you are expecting significant fabric losses. You basically pump straight from the ASHP at 40c into the slab and hope it doesn’t overheat .... 150mm is usual for a decent insulation spec - 200mm and you’re probably at low uValues for most elements and don’t need massive amounts of heat input. 1 Link to comment Share on other sites More sharing options...
MikeSharp01 Posted June 5, 2018 Share Posted June 5, 2018 20 minutes ago, PeterW said: ASHP 100mm spacings is for standard build houses where you don’t have a buffer and you are expecting significant fabric losses. You basically pump straight from the ASHP at 40c into the slab and hope it doesn’t overheat .... 150mm is usual for a decent insulation spec - 200mm and you’re probably at low uValues for most elements and don’t need massive amounts of heat input. Makes Perfect sense now you describe it. At 100mm I was using about 200m per zone (3 zones) at 200mm I am using 300m for the whole 105m2 so cheaper as well. Link to comment Share on other sites More sharing options...
ProDave Posted June 5, 2018 Author Share Posted June 5, 2018 Our last house we went for 200mm, that was nothing special in terms of insulation or air tightness. So I am going for 200 again on out new much better insulated and much ore air tight house, expecting to run the UFH at a very low temperature. 200mm is the obvious spacing with 400mm joist centres, anything else would be complicated. Link to comment Share on other sites More sharing options...
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