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@ChrisR You mentioned leaks at low pressure, so if the system is pressurised (which on closed systems is) is it OK to use push-fits. For HW is better to use plastic as it reduces the heat loss. Do people avoid using plastic for CH because pipes are exposed to high temperature for longer than...

the same used for high pressure cold/hot water, it has double wall, is this called 'barrier' pipe?

Man, did this thread grow! Good news, brand new 22mm is now supplying my combi...the mess is nearly over. All working like a charm, except the one annoying thing, a humming FAN. Its not very obvious, but I keep homing on it, I don't like it. I should have gone for a straight combi, not...

I have similar problem, but moving the rad to the oposite wall, my questions is: can I use plastic pipes (15mm) and push-fits instead of copper ones? Thanks

@namsag I'd say this is a nice finish for this thread. @all Happy New Year and Thank you for your input. p.s. don't be afraid to try d.i.y. read the regs and don't be a cowboy.

here is another opinion extracted from the following link: http://www.makewrite.demon.co.uk/GasFitting.html "2 Legal Requirements & Safety a) Is it legal to do DIY work on gas? In short, yes it is, but only if you are competent to do so. So how is competence judged? You are to be...

@PEDANTICVINDICTIVEMAN I am a bit disappointed too, 87% efficiency (class B) for a baxi combi instant 105 HE. I was looking for class A, but have to admit I've slipped on this one...too late now. @corgiman Yes, I am going it myself, not a big deal. I am not corgi, but will get one to...

... on a second thought, I really think I shouldn't waste my time and do it properly. I was tempted as the 15mm pipe was 1m from my combi and I was rushing to get it done for the new year. The combi has 12 l/min flow rate and I really want to get rid of my electric shower. I am realising now...

Thank you all for your replies. I'll give it a try and use 15mm, its about 8m from the gas meter. I'll let you know how it goes in a few days time. Thanks again

Thanks kevplumb, based on what you said, to test my understanding, the flow rate will not be affected, but the effective water temperature of 12 l/min flow rate will be lower than if using boiler with 9 l/min flow rate. I am still currious to know what the impact will be if supplying a combi...

I am thinking of changing my 'glow-warm' back boiler with more efficient condensing combi. The problem I have is the gas pipe that is terminated in my kitchen is 1/2 inch and not 22mm. If I was to connect Baxi 105 HE (which should normaly give me flow rate of 12 litres per minute) to a gas...