I currently have two vailant thermocompact boilers operating independent systems for hot water and central heating ,one boiler does one side of the house the other boiler the other side.These boilers sit side by side so all ch. pipework is easy to access.
If I wanted to upgrade to a more efficient condensing boiler I think it is possible to link the central heating systems by joing the flow of one to the return of the other and vice versa as the rad thermostats a bi directional. The problem comes with the two hot water tanks and the heating of the water in them. Ideally I want to keep two for adequate supply as I have put in three extra bathrooms ensuite. QUESTION... is it possible for one boiler to control two motorised valves to the two tanks independently, does all of the above seem feasible?