On Thursday, 27 April 2017 15:36:27 UTC+1, Graeme wrote:
This is a message I posted in November 2013 :

quote Just had a new hot water tank fitted (not brave enough to DIY)
and it is fine. Hot water is hot etc., but hot water now takes much
longer to reach the taps than it did with the old tank.

Most of the lag is just the time it takes to heat all the copper fittings en route. The cooled water comes through fast. Have they taken some fittings off?