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@hippy
They're expensive to run according to the sparky that fixed ours. No idea how much the big ones are.
The boiler would only be for hot water, not heating so wouldn't be a combi-boiler, assuming I'm understanding what 'combi boiler' means here.
I have a coffee machine with hot water so don't need or want a instant-hot zip tap.
The problem is lack of hot water pressure. This is why I was considering the unvented system.
I would also like to get rid of the cold water tank if possible to free up a big chunk of cupboard space.
stevo: Our flat is pretty warm - double glazing, etc so I doubt we'd have any Belfastesque issues. The water isn't the hottest at the end of the day but we have a really old immersion heater and crappy insulation on it.