Combi boiler driving central heating, can I add a seconded boiler, IE wood-burning stove. How?
Although as suggested by Jayktee the Dunsley Neutralizer is a suitable product for interconnecting two open vented systems, the unit is not suitable for connecting to a sealed system which you have. See the Dunsley web site for confirmation of this. There are alternative methods of connecting vented and sealed systems, but as Xenon says, the method has to be very carefully considered and is not just a matter of teeing the two systems together. Your major problem is that you aim to couple a boiler which has a fairly precise control system, which will immediately shut down the boiler when the heating requirements are satisfied, to a wood burner which probably has a fairly crude temperature control system and will still continue producing heat when all demands are satisfied. The system will therefore require a heat sink to absorb surplus energy, a heat exchanger to separate the two systems and an open feed and expansion tank for the wood burner system as using a sealed system would not be
