Water heating system

A water heating system for a building, comprising: a plurality of water heaters; a water supply circuit for supplying water from the heaters to a plurality of outlets for heated water in the building; at least one pump for pumping water through the system; and at least one storage tank configured to supply water to the heaters and receive heated water not used at the outlets from the supply circuit through a heated water return line; wherein the at least one storage tank is also configured to supply water into the supply circuit without passing through the heaters via a bypass circuit in response to demand at the outlets for heated water exceeding a heating capacity of the heaters. C)D U)Y C) C 0 NoIt '?.--C --- El C) t a)e -00 CO zJ -o CDz