Thanks for making a video of my suggestion Al. I have always drained and filled my heating system using this method. Although I did forget to say motorised valves should be opened manually bit someone picked that up in any case.

Excellent video mate, what a great method with pressurising it with an outside tap, genius

Thank you for suggesting the mains pressure refill technique. I tried it yesterday but unfortunately I still have the same annoying downstairs airlock that I get when I fill up from the loft tank. All the rads are full but there must be a cul-de-sac in the pipes somewhere. Whoever invented these central heating airlocks deserves the Raspberry of the century award. I bet it was that Archimedes bloke. He was always bragging about the smart Alec stuff he does with water. Another Raspberry goes to the flares and Bay City Rollers loving chappie in the 70s who mounted our heavy bedroom radiator using just 4 one inch screws. Thanks very much. I took off the old leaky valve and the bloomin' thing just fell off the wall. Grrrrrrr! Finally, a special big Raspberry to the wasp that tried to fly into my ear in the loft. It's amazing how fast someone can move in a confined space once the adrenaline kicks in.

Backfilling from the mains. Fantastic idea. Tie up the f&e float valve. Check that some clumsy oafs, usually those folk who put in additional loft insulation, haven't wrecked the warning/overflow pipework and that it actually solvent welded and clipped up. Otherwise, in absence of another pair of hands/eyes, you might inadvertently install another invigorating cold shower. Coming thru a bedroom ceiling.

Hi Al and Jan😊, this is a great tip Al, whish I'd known of this a few years back, it would have saved alot of head scratching at my daughters house, cheers mate, I hope you two are doing ok , and looking forward to christmas, stay safe, best wishe's to all, Stuart UK.

Not for the faint hearted Al bung the tank 💪💪💪 pull a vacuum gets the bum cheeks rattling

I have removed F&E tank and added a expansion vessel and created a seal system. Problem solved no more noise&air lock. Happy customer. I knew about this method which work, but if separator is blocked it might not worked.

Maybe its just me, but I found it a bit hard to follow

Thanks Alan 👍🏻

Hi I'm a new viewer, and have landed on this video because I reckon I've got a sludgy old system with possible air locks I need to deal with. I'm not a plumber or any kind of expert in this, but I'd have a worry that the water company would (in theory) take issue with connecting a central heating system directly to the mains like this? By the way I'm not having a moan, you've got a good presentational style and I've subbed!

🚨Urgent!! where would i find the drain off valve that you soke about? ar the bottom of the ground floor radiator or on the pipe at the top of thecradiator on my boiler pipes feed in fron the top open vented

I've had my water switched off at the mains for a few days and emptied the tanks due to a leaking loo now when the water has been turned back on it's not filling the loft tank. Can you advise please? Thank you.

Great videos mate. In that house layout u are using. Where would the mains switch for the boiler be installed???

Thanks 😊

Set the motorized valve to the fully open position manually ?

Hi Al many thanks for your videos. I'm stuck with lots of air in my system now after draining down to change a mid position valve. Using the main's pressure makes a lot of sense unfortunately there isn't an expansion pipe that I can see in my loft. what would happen to the air in this situation ? Cheers Al.

I see in the drawing the HOT water comes DOWN from the top floor to the first floor and back to the boiler? Interesting that the circulator pump is on the feed. We only see the pump installed on the RETURN side. Therefore pulling the water back to the boiler.

Nowhere to be found in North America. peculiar system