Mike wrote:

"Ian Stirling" wrote in message
...
Mike wrote:
snip
It's set to highest temperature but as hot water is only needed very
occasionally I don't want to keep it warm all the time so most of the
time
it will be coming from cold. The dual heater tank would be fine - do
you
have any idea where I can get one ?

Is it in a position where you could add extra insulation?
200-400mm of loft insulation helps lots to reduce energy loss.

It's outside in an unheated barn. We need a lot of hot water for use on the
farm only occasionally so something that heats up quickly when needed would
be ideal. I looked at in-line water heaters but the ones that are more than
3kW always seem a lot more expensive than a cheap tank and a couple of
immersion heaters. Of course a 7kW shower unit could possibly be bodged to

If possible, enough insulation may mean that it's economic to keep heated,
if only used weekly.