back boiler and boiler linked

[CXR100]

ive got an open fire in my house, heating hot water on gravity and central heating on a pumped circuit. could I connect a conventional boiler to the system somehow without going into big costs using the same cylinder ect. I asked a plumber I know and he told me I could do it using a 3 port valve , connecting the fire and boiler together then to a 3 port valve and some pipe stat, he didn't fully explain it to me. I also asked and electrician and he also told me he has wired a system up for someone who did the same, any help would be great, thanks

 

[quality]

Dunsley neutraliser is an option as is a H2 panel

 

[bright spark]

Another is a heat genie. But I believe they're dear enough