A hot water ctorage cylinder!
You can also have a combi serving say one bathroom or the kitchen and a cylinder serving the rest.
Tony
Thanks for reply, I understand I can get a cylinder but I am trying to find out if the combi will do the job before going down that system route.
here is the requirements of the enclosure.
Water supply requirement: separate hot and cold inputs are required, each at a pressure of 1.5 - 3 Bar. NB: if the water pressure is below this range a twin negative head pump must be used to boost the hot and cold supply.
A pump must not be used on the output of a combi boiler.