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I've tried the top 28 already but not the bottom 28. I'll try the bottom one when I get home tonight. Not sure what difference it makes connecting the hose the other way around. Connecting to the vent sends water around the system, any muck gets push into the tank via the outlet.

I have had to drain my central heating system to repair a leak. Refilled the system and blend the radiators. I have no air in the radiators and they get hot. However I have no hot water. Spoke to a plummer friend who has tried to help. Connected hose pipe onto vent pipe in loft and back filled...