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Thanks, no I was not going to do that as I did see the part about covering the fan. Water is going to come out at the nut and not just through the tube in that case, I thought there might be a screw to vent it direct into the tube like a radiator.

I'm planning to add a radiator in the kitchen so I will need to drain the whole system. I have a worcester bosch 28i junior and it says to vent the heat exchanger after filling. I have taken the cover off and can see the area the manual points to, it's a white plastic nut with a tube attached...