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General Plumbing and Gasfitting Talk => Ask Plumbers (Public) => Plumbing => Q & A - Hot Water Cylinders => Topic started by: AlCan on August 21, 2014, 09:07:56 PM

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Title: Plastic Pipe inside HW Cupboard?
Post by: AlCan on August 21, 2014, 09:07:56 PM

Hi Guys,

I assume that it's not permitted to have exposed plastic tubing (Buteline, etc) visible inside a Hot Water cupboard, though I have seen plenty of photos showing it. A mate even showed off his new Mains Pressure HWC to me the the other day, and it had Buteline all over the place. But I wonder if it's allowed?

I know the TPR valve outlet pipe has to be copper, and there has to be one metre of copper from the top of the cylinder outlet before any other connection, but I don't really understand why that is as the water flow isn't going to cool down much over that distance.

Could someone please clarify for me?

Title: Re: Plastic Pipe inside HW Cupboard?
Post by: roberto on August 22, 2014, 08:45:23 PM

we use dux secura on the inlet to every hwc and in a wingback going up to the ceiling (hot) which the tempering valve is screwed into (1m of copper out of the hwc of course)...we do over 100 houses a year and never get asked any question or fail any inspections.....so id say its perfectly fine
 

Title: Re: Plastic Pipe inside HW Cupboard?
Post by: AlCan on August 22, 2014, 10:04:03 PM

Thanks roberto,

That's good enough for me.

I still want to go have another look at my mate's install, as I'm pretty sure I didn't see a copper overflow pipe either...

Title: Re: Plastic Pipe inside HW Cupboard?
Post by: CristyCMcAlister on December 04, 2014, 11:00:39 PM

Using a plastic pipe inside a HW cupboard is not a good idea at all, because generally pipes are made up of plastic and if you use it inside a HW cupboard, then it can easily get damaged, and you have to suffer loss. Ergo, use different kinds of pipes.

Title: Re: Plastic Pipe inside HW Cupboard?
Post by: CristyCMcAlister on December 04, 2014, 11:04:40 PM

I guess that using a plastic pipe inside a HW cupboard is not a god idea because it is not the general idea of plumbing. These plastic pipes are not resistible to heat and hence, they will be damaged easily

Title: Re: Plastic Pipe inside HW Cupboard?
Post by: rocketeer2 on December 07, 2014, 08:59:14 PM

FYI Dux Secura installation guide, Page 8 HWC connections.

http://www.dux.co.nz/cms_show_download.php?id=69