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chrisbmx116-
Hot water tank - at mains pressure. So you can run more than one shower at once without the pressure dropping off a cliff.
Obvs. requires good mains pressure! Or you can go nuts and have a non pressurised tank and a driver pump. This is the best, but it's complex and requires loads of floorspace as you need a hot water tank and a feed tank for the tank....
Howard
I’m deeply suspicious of combis in houses when not attached to an unvented cylinder of some sort.