I've used it and hate it - just that feeling of quality and reliability that
is lacking. Will not buy it again, ever.
Used loads of Hep2O on a number of properties and never had a problem with
it, provided it gets pushed into the fitting sufficiently. Buy the 'proper'
pipe cutting tool or blag your local merchants into giving you one for free.
Always use pipe inserts. Barrier pipe is supposed to be better for CH
systems but I don't know of a single plumber (all CORGI registered) who
bothers paying the extra. The only drawback of not using it is that British
Gas will not then cover it as part of their 'breakdown insurance' packages.
The pipe is reasonably priced but fittings can be expensive. You just need
to know where to go. I can get hold of any Hep fitting for £1 each if
anyone is interested, although you would need to make it a pack big enough
to be worthwhile. E-mail me direct if you want some.
Overall, pushfit is a boon and much quicker that copper, without any fire
risk. Let me hope I never live to regret saying that!
Screwfix is selling some copper push-fits. They look ok but not sure of
their quality in service. They are much lower profile and yesterday I put a
few in where the pipework would be visible. We shall see how they fare.
Just some thoughts.
That is not quite correct. The issue of oxygen diffusion is not
related to whether the system is open or sealed but whether it is a
closed circulation system or not - i.e. the same water circulating
continuously; and the fact that heating systems normally contain
ferrous metal components - e.g. radiators.
For DHW and potable water services, it becomes a non-issue because the
water already contains a fair amount of oxygen anyway.
To email, substitute .nospam with .gl
On Sat, 29 Nov 2003 12:17:20 +0000, Andy Hall wrote:
red herring put about by BG for there own reasons. 
Although I have no data to hand for oxygen diffusion rates through >1mm of
plastic, ot does seem counter intuitive that oxygen could diffuse into
water under pressure from outside.
All this has to be set against the oxygen diffusion that possible with a
Anyone got soem real data around, is the Hepworths advisor about?
 There might be a number of reaons for this:
A) BG workforce conservatism.
B) Possible greater reveue from selling a new installation.
C) Possible greater realiability by forcing a replacement of the system.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
It is a real phenomenon.
For example, there is an ISO standard in progress on its measurement.
It does seem counterintuitive that oxygen would diffuse through
plastic when the mechanical pressure on one side is higher than the
However, the phenomenon is going on at a molecular level and is
related to concentrations rather than mechanical pressure..
Diffusion is basically the tendency of molecules to move from an area
of higher concentration to one of lower concentration. The oxygen
diffuses through because the concentration of molecules in the air is
less than that in the water.
Many types of plastic have a very large molecule in comparison to
oxygen which increases the diffusion rate. There are even specific
plastics for biological and medical purposes (e.g. dialysis) designed
to maximise diffusion - e.g. www.visking.com
I don't know if that's good advice, I think my house was plumbed with
cheap imported copper pipe which is why I'm getting pinholes appearing.
I would pay a bit more and get better quality, its worth it in the long
term, unless you buy two cheap heating/water systems and if one fails
use the other one, simple!
When I used it a few years back it was all speedfit stuff. No problems
so far. AFAIK, they still sell speedfit although the design has changed
since I did our kitchen - I think it now has an extra twist lock or
Well, I have lost track of this post but I certainly wouldn't say Speedfit
was quality kit. They are absolute crap.
As for the Screwfix stuff, I bought a load of the copper push-fit stuff to
try them out. I am sending them back tomorrow. Every single fitting has
leaked on heating systems. I am very dissapointed.
If it helps, I have replaced every one with Hep2O and no problems so far.
No problems in all the years I have been using Hep either. I cannot commetn
on the other makes since I have no experience of them.
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