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JohnD, knock yourself out, carry on bodging joints with PTFE if thats what you want, but don't advise others incorrectly. Simple advice for those wishing to do it correctly is follow the manufacturers instructions.

I really find this amusing, that some on here believe they know better than the manufacturers, here is another link, Conex fittings, no mention of any PTFE http://www.ibpconex.co.uk/pdf/conex_compression_fitting.pdf I have been installing for 28 years, never used any PTFE on compression fittings...

It is nothing to do with proffessional plumbers boasting, the manufacturers of compression fittings do not state anything about using PTFE on their fittings, have a look at the link in my previous post.

You never need to use PTFE on a compression fitting, it is something done by DIYers, Not tradesmen have a look here http://www.yorkshirefittings.co.uk/media/training/TF_2008-12-19/pegler-yorkshire/shell-web.html section 4, no mention of PTFE been required

If your hot water is a gravity system, you will find that a new cylinder will have a coil designed for a pumped system, unless you specifically ask for a cylinder for a gravity circuit, with a cylinder for pumped systems, you may find that gravity will not occur due to the high resistance within...

"Pressure vessels and liable to explode if not maintained" Please don't talk such nonsense on a public forum, why would the vessel explode, please explain, and can you also explain how you came to the conclusion that the OP has an unvented cylinder simply because he has a Pullen immersion heater