It's an open system with an F&E tank in the loft extension. Do I stop the water there
That. I have a tap on the pipe to mine which is handy but otherwise just tie the float up with something as TW says.
What other things don't need to consider?
Expect to be bleeding radiators for a couple of days afterwards.
Cheers, I'll take a closer look at the tank later. I'm ok with bleeding radiators afterwards too.
Tie up the ballcock, Good luck refilling if your not well versed on them.
It'll almost guaranteed airlock and you'll have a mare getting it to fill and go. Took us 5 hours to get a system filled and working about a month ago.
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That. I have a tap on the pipe to mine which is handy but otherwise just tie the float up with something as TW says.
Expect to be bleeding radiators for a couple of days afterwards.