Rayburn plumed into vented hot water tank

[Macca66]

Hi,
I have a rayburn 212 that I have plumbed into a vented hot water tank as far as I am aware I do not have to vent the rayburn as the tank is vented, is this correct.
attached Is an image of the tank and a very basic schematic, fig 1 is how I have it plumed fig 2 is how I would plumb if the stove should have its own vent

 

[Marc Bowers]

You show a primary flow and return from the Rayburn into the cylinder but the schematic doesn’t appear to show any manufacturer in and outlet. It looks like the manufacturers drawing is for a direct version of the cylinder and not an indirect cylinder which you appear to be setting up. What temperature controls and safety valves are being used? It initially looks like it’s got the potential for overheating and over-pressurisation. I might be missing something but it looks very wrong.

 

[SimonG]

If cylinders indirect then you've created a potential bomb.

 

[Macca66]

This is probibaly a better diagram of the cylinder, The combustion stove is direct heating the water in the cylinder and the potable water is pumped through as a heat exchange, so the cylinder is open vented and the stove is connected to the open vented section of the cylinder