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@Aldersbrook has your "plumber" told you that the flash combi will also stop working below 1 bar mains pressure and it needs 1.7 bar for maximum performance? Unless you live in an area with known mains pressure problems then you shouldn't worry about the low risk of a pressure drop. In my opinion a combi is always a second best solution which should only be considered when there is absolutely no space for a more reliable set up.
Charlie_L
@Aldersbrook
This is the storage combi boiler mentioned, one of the most powerful on the market if not the most.
https://www.plumbnation.co.uk/site/worcester-greenstar-highflow-550cdi-combination-boiler-natural-gas-erp/