The only thing is that I've found on occasions that on cylinders the threaded fittings (especially larger sizes) need a reasonable amount of packing to avoid leaks. Therefore I've tended to use hemp and Boss green, but PTFE should be OK as long as the right amount (not too little or too much) is used, and of course applied the right way round.
Well, we installed the new cylinder yesterday. And boy! did it leak!
The leak came from the seam between the base of the tank and the sides. So no hot water last night, and it was off to Wickes first thing this morning for yet another new cylinder, which we fitted within an hour, having learned how to do it yesterday.
Our next house will have a combination boiler and no hot water cylinder. If I never see another cylinder it will be too soon.
;-)
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