If water use is predictable and therefore water use reproducible, you can check for yourself can't you? Note the gas meter reading and do a test on 24x7 and another when it's on timer.
If the difference for always being on is negligible then I think I'd go with that option.
I'm about to have a combi boiler for the first time starting next Thursday.... and according to United Utilities a water meter (vendor says there isn't one!?!?).
Last edited by: rtj70 on Sun 23 May 10 at 14:49
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