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pushfit are they reliable?

Water could build up there covering the pipe. Heat cold be extracted from the pipe too.

You will not be impressed.

Reply to
IMM
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Oh I know that, what I was trying to say was I didn't try the hair dryer trick because I didn't think it was worth it - the pipe's designed to carry up to 92 degrees C, so an ickle hairdryer wouldn't make a blip on allowing flexibility.

-- cheers,

witchy/binarydinosaurs

Reply to
Witchy

I thought about trying that, but then thought that if a hair dryer allows you to bend it what's it going to do when subjected to the temperatures of a CH system?

-- cheers,

witchy/binarydinosaurs

Reply to
Witchy

In article , IMM writes

Yes Happy Christmas John, now what I meant was: which part of the plastic system do you think will fail i.e. will the plastic itself go brittle, will the O rings fail, will the grab ring fail, will it suffer fatigue (like many metals do) what exactly do you think will fail?. Once we've identified your concerns we can address them individually and allay all your fears, I'm sure there were similar people like you about when they started using that new fangled stuff called copper.

Reply to
David

Heat does improve the flexibility. However why bother just get Hep2O pipe which is flexible.

Reply to
Ed Sirett

Good possibility, with all that constant expansion and contraction over the years. And some of it does move a hell of a lot. Visually inches.

With constant rubbing through swivelling due to expansion, I would say yes. Look at the O rings on swivel kitchen mixers. They don't last that long. Speedfit are selling inserts with addition O rings, Osma Gold has a double contact O ring. They are all attempting to improve the products because of failures they have had. They are still evolving. Not there yet.

Possibility Maxie.

Probably O ring and then pipe.

No there was none. Over lead, there was no disadvantages of copper pipe and it was immediately accepted. When compression joints came in the old school scorned them. My mothers house was built in 1952 with compression joints, gas and water, and not one failed.

Plastic is fine for cold water, it is when it is "hot", that problems arise.

If the variants of plastic used in plastic piping was so brilliant then ask yourself this question. Why don't we see plastic hot water cylinders?

They could have ridges on the outside giving rigidity and cross members inside the cylinder also giving strength too. The could double skin it. I'm sure there is a myriad of ways of strengthening the thing. If what they say about the piping is correct then this stuff is ideal for hot water storage cylinders: prevents scale build up, less heat loss as copper is a good conductor, longevity of 50 years etc.

We have had cold water storage in plastic tanks for over 40 years, yet no plastic hot water cylinders. Has the penny dropped yet?

Ae you a plastic company troll?

Reply to
IMM

Plenty of car radiator parts are fabricated from plastic, which handles water at a running temp of around 100 deg C, and with presumably a margin of safety on top. So it seems that plastic is a suitable material for hot water - even our kettle is plastic.

I think its more a case that the tooling for large plastic structures is expensive and not viable when cheaper materials / tooling is available.

Nick

Reply to
Nick Smith

The expectancy of most car parts is less than a plumbing or heating system. If a car has done 15 years it is deemed to have done very good service. Many of the components during those 15 years would have been replaced. No one expects a top radiator hose to last 15 years.

I think it a case of, that the current plastic offerings are not suitable for storing large volumes of hot water that may overboil here and there. I'm sure they can come close, but it will be expensive to do so. Look at the cost of plastic v copper pipe.

Reply to
IMM

*some* car parts.

The top radiator hose is not likely to be plastic. I would be very surprised to see the plastic endcap of a radiator fail in 15 years. The core fairly likely but then that is made from a much inferior material (hint: not plastic :))

Eh? Isn't that the arguement? Its not that it can't be done just that there is little economic point in it. Plastic pipes/pushfits have a lot of advantages despite the extra cost. Its harder to see how to justify the expense for a hot water tank IMHO.

Darren

Reply to
dmc

I would say "most".

It is a type of plastic, certainly not metal.

You mean "inferior quality".

The argument is that it "can't" be done 100% successfully. If they could have done it they would have by now.

Alas, far too many disadvantages, in which many bury their heads in the sand when assessing.

Reply to
IMM

If our local shed stocks it I'll give it a go. I always seem to need it when normal merchants are closed :) Pity really, since the local merchant is 5 minute's drive away!

-- cheers,

witchy/binarydinosaurs

Reply to
Witchy

In message , Witchy writes

Hep2O doesn't seem to available in the sheds, they only seem to stock Speedfit

Reply to
chris French

Can anyone vouch (or not) for the quality of the kit that Screwfix sell? Described as "Pushfit" - presumably that's not the brandname - is it an own brand or someone else's rebadged?

Thanks David

Reply to
Lobster

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 something.

Darren

Reply to
dmc

Speedfit? Please!!!

Osma Gold and Marley Equator are about the best.

Reply to
IMM

The white plastic stuff is John Guest Speedfit. The copper stuff (p 205 of Catalogue issue 72) is Conex.

I think if you google this thread back a few weeks you'll get a reasonable spread of view points.

Reply to
Ed Sirett

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.

HTH Rob

Reply to
Kalico

I am no fan of Speedfit either. It is also not that cheap.

Aren't they made by Conex? If so that is strange. They always make good stuff. Was the pipe perfectly round with no dents or burrs?

Hep is ugly and bulky to look at. I find Soma Gold and Marley equator better. Osma looks very neat.

Reply to
IMM

Well, it was all mounted ok and the leaks were only tiny, but leaks there were, unfortunately. I shall not be buying any more, which is a pity since I had hoped that they would be used where appearance was important (copper). They are also quite slimline, which the Hep is not, as you point out.

I shall have to check those out. I guess I buy what I can easily get hold of and have good experience with.

Rob

Reply to
Kalico

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