Hi All,
I just went into my 'local plumbers merchant' for a bit of advise and to then (based on the advise) buy some bits.
I have used them many times over the years, one guy is a stores man the other much more helpful (so guess which one I normally head for). ;-)
Today my friendly guy wasn't there so had to use the stores man and whilst trying to keep it short and relevant, briefly described what I needed to do (the water connections on this replacement multipoint water heater). I mentioned the the old heater used joints with a washer (on a flat shoulder, as per a tap connector on both fitting and appliance) whereas the new heater used olived type compression joints, however one of the ends I had from the old installation was quite a neat tight 90 deg bend in 15mm copper but not a 'fitting' as such (ie, just a bit of bent 15mm copper, no flange or collar etc) and I could probably use something similar to re-fit the new heater in the existing location. [1]
A guy hanging about in the shop came over (I'd seen him in there before, maybe their 'plumber') and suggested the bent bit of copper may have been part of a 'tail' that could have been supplied with the boiler and instead I could just use a 'street elbow'. I asked if that was ok to use with what was supposed to be an olived compression connection (as opposed to a washered connection, as with a tap connector) and he muttered summat about 'if you don't know what you are doing you shouldn't be doing it' yada yada.
I thanked him again for trying to help, bade my farewells and went and spent 30 quid in Wickes instead. I found what I was looking for re the neat bent pipe in the form of a 'part crossover 15mm' where I can cut a nice neat 90 deg section of plain copper pipe, suitable for fitting into the heater one end (with an olive) and the isolation valve at the other (again, a compression joint). I could have done (and may still do) the same thing with a std 90 deg compression elbow and a couple of bits of 15mm pipe, but that would result in a slightly tighter turn (water resistance etc).
No wonder some of these 'local traders' are going out of business [2]. :-(
All the best ..
T i m
[1] One of the other original water connections was a 90 deg 15mm tap connector and in my understanding, 'not suitable' for use against an olived type fitting? A connection possibly originally made by a professional plumber, like the guy in the shop! ;-)
[2] If I get the opportunity I will (quietly) mention what happened to the friendly guy (and possibly the owner), just so he knows ...