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Does anyone know how i go about using a wet dry vacuum to clear dirt and limescale from the inside of a Megaflow Unvented Cylinder ?

Hoping someone may be able to help me with a lack of hot water from my direct Megaflow. For some reason we are not getting any hot water from the economy 7. When we turn on the back up immersion heater (which I understand is the top immersion), the water heats up so much that it all pours out...