Using UFH PEX offcuts for plumbing

[andyrob]

I have some and will have a lot more 17x2 PEX offcuts - several rolls of 20m+ - that are too short to use for UFH circuits.

But I will have a lot of plumbing to do and so could use eg the Myson 17mm PEX to 15mm copper adaptors. These are more than £5 each - are any other alternatives and do you know of any potential problems with using the PEX pipe for this?

Thanks, Andy

[dhaslam]

The main problem would be that there  are no fittings available.    You will probably find other uses for it.  I have used some for ducting cables outside.

[EccentricAnomaly]

Sorry, not an answer, but for background education does 17×2 mean 17 mm outside diameter, 2 mm wall thickness? The first few Google results didn't say.

[BruceB]

I had a similar situation of hundreds of metres of 16mm good quality UFH pipe left over from an Old Mill refurb.  You can get the fittings (Uponor I think for mine), but they are expensive.  IIRC 16mm fittings were also available in France.  I used a few lengths for long runs where the cost of fittings did not make it uneconomical, but most would say you are creating a nightmare for any plumber following on behind you in a few years time!
Regards
Bruce

[andyrob]

"does 17×2 mean 17 mm outside diameter, 2 mm wall thickness?"

Yes - exactly that. I just read also that metric pipe measurements are always OD (outside diameter) but imperial pipe was measured internally.

So 1/2" pipe was an internal 1/2 but the OD was more or less 15mm - hence the interchangeability.

And getting back to the question - as with old CDs (even DVDs I suppose now) for which there is no practical use except for kids to make clocks in Technology lessons, or as cabbage patch bird scarers,

Andy

[biff]

i have loads of this pipe and had to addmitt that fittings were hard to get.
                 but we have a long garden and we decided to pipe the whole lenght to the shed at the far end.i was able to bodge it with the cheap garden hose fittings and insulating tape,so now there is no place on the site that does not have access to handy water.however i still have hundreds of feet of the stuff.
           biff

[ecogeorge]

I had a similar situation of hundreds of metres of 16mm good quality UFH pipe left over from an Old Mill refurb.  You can get the fittings (Uponor I think for mine), but they are expensive.  IIRC 16mm fittings were also available in France.  I used a few lengths for long runs where the cost of fittings did not make it uneconomical, but most would say you are creating a nightmare for any plumber following on behind you in a few years time!
Regards
Bruce

Bosta - used to do a 16mm-1/2" M bsp fitting -used it to go from underfloor pipe to radiators.
rgds George.

[titan]

I have a load of 16 mm pipe left over from my UFH, you can get either 16 x 15 compression fittings or the 16mm x 1/2" male Euroconus fittings both are cheap enough. Pulsar direct used to have a whole range of fittings but they don't seem to be on their web site at the moment.

[Brandon]

I use the Ivar multi press fittings, and their pipe too.  I have rucks of pipe left over from UFH, so I run first fix in it. 16x2 pex alu pex.  also use 20mm and 26mm, the fittings are not prohibitive by any means, but the tool is dear if you do not use it for work.  You can hire them mind.  I terminate in 1/2" or 3/4" irons to get the copper to.

[baker]

  
Hi
from memory if it serves me right
when testing pipe for dhw/cold water, is not the same as for heating pipe
 plastic exposed to the water with  additives , chemicly treated. the pipe hydrocarbons must not break down or be a hosts for bacteria growth
most pipes are suitable but i would check its approved
baker    
 sorry have to go smell something burning

[eabadger]

I have used odd size pipe and connected using car heater hose and jubilee clips, depends on application and pressure it will be under, I have used odd pipe to connect up my ex lorry ebersparcher diesel boiler to both a dhw cylinder and radiators, now added a wood boiler, but used copper for obvious reasons.