Is this Pex Al Pex pipe any good?

[Onoff]

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

[Alexphd1]

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

[PeterW]

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. 

[Alexphd1]

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. 

[PeterW]

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.

[Alexphd1]

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.

[Onoff]

The 15mm copper to 16mm pex al pex elbows I've used:

 

 

 

[ProDave]

^^ TP sell that adaptor and it fits any 15mm compression fitting, straight, elbow or tee.

[Onoff]

This was another 16mm pipe fitting:

 

 

 

 

[ProDave]

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

[Nickfromwales]

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 . 

[Onoff]

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!

[ProDave]

My decision was slightly swayed by the fact all the sellers with the 300M rolls are currently out of stock.

[Nickfromwales]

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. . 

 

[Barney12]

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. 

[ProDave]

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.

[MikeSharp01]

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

[joe90]

Mine was designed by Wunda, using an ASHP and they specced 150mm centres!

[jack]

Ours is 200mm. You don't need ultra-close spacings if you're going low temp and have good insulation.

[PeterW]

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. 

 

 

[MikeSharp01]

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.

[ProDave]

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.