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:oops: :lol: oh well at least someone is on the ball. yes 24Kw Thanks.

yes new cylinder, feeds, valves, pump. Existing boiler fitted a year ago. reason for the work, the HW side is over 20 years old and importantley a long way from the boiler in a location that has a change of use. Plan to fit the cylinder much closer to the boiler. Thanks for the info so far.

cool. thanks. just a thought, is the heat output of the boiler a factor?? Would the cylinder heat up time be reduced from what it could be if I used 22 or is that not relivent on a pumped 8m total circuit. Is there something about CH HW balancing that I need to be thinking about? Thanks

when running feeds/return to a copper cylinder in an indirect system from a 80btu or so boiler 4m away, which size cu pipe is the norm, 22 or 28... is there a reg for this? or do you use 22 out of boiler thru pump and flow directors and such like and then 28 to the tank?? Many Thanks