You will only have hot water from the combi boiler at one tap/outlet. It will no longer be feeding the whole house.
So if you run out of hot water and want another shower you can't rely on the combi for hot water as it will probably just be feeding a sink or whatever it is near.
So if you run out of hot water and want another shower you can't rely on the combi for hot water as it will probably just be feeding a sink or whatever it is near.