Any plumbers / central heating / home hot water / master DIY'er experts out there? I don't know a great deal about this stuff so I'll just give some details and the symptoms as know them... The house has a water tank / immersion heater thing (big cylinder thing in a little cupboard) which as far as I can tell handles the hot water for the taps. there is also a combi boiler which seems to only jump into life when the central heating is on. Its for that reason that believe the immersion heater does the hot water. Anyways due to the hot weather the central heating has been turned completely off from the timer. Well I guess more acurately, the timer is set to not come on at all so the heating doesn't come on. But since that, I've not really had an hot water from the taps. Its not freezing cold, as cold as the cold tap water but its not warm and doesn't make for nice showers or shaving. It seems that sometimes the water is hot enough, but its certainly not a case of turn the tap (or shower) on and voila, hot water. It can take ten minutes for the water to warm up sufficiently. From the immersion tank was a two way lever, one position is central heating, the opposite is hot water. The lever was set to the middle but now I've moved it to Hot Water, but it doesn't seem to have changed anything.... From the plumbing from the cylinder is a electric water pump which I think feeds to the combi boiler. Thanks in advance folks!!!