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I just want to drain the boiler not the circuit

Thanks, if you have an external drain off valve its alot quicker :)

I need to represurize the expansion vessel on my 24CDi. I understand the boiler needs to be drained first, and I not sure where the drain plug is on the boiler.

it is possible that the expansion vessel needs to be represurized. the vessel has a bicyle type value on it. the boiler needs to be drained of water, then pump the vessel to 1 bar and refill