I've got a 7.3kW unit in our holiday chalet in Somerset and it's useless. You have to have a very slow flow to get any decent heat output. In cold weather like we have at the moment the incoming water is even colder so the outgoing 'hot' water is not very warm at all. It would take forever to fill a sink and even then it wouldn't really be hot enough to wash a bowl of dishes.
One person.
Daily use.
Mostly washing hands, mugs and filling the occasional bucket. Anything else would be occasional but I'd rather over-spec a bit than wish I had.
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