How To Pump An Expansion Vessel | What Tools To Use

I cant explain how much help your work on this channel does for people in the trade. It is so useful in refreshing and teaching people. For me I trained 17 years ago and only got back into it 3 years ago so 13 years out of the trade, you forget all sorts, especially when you weren't time served. Thankyou.

Wowser, that was indepth. Thank you Allen & Roy , I'm all pumped up and have expanded my knowledge on vessels.

Amazing video! This helped to explain my issue so much: My parents boiler has never been serviced, but regularly stops working due to low or high pressure. When pressure is too low, they top it up. After topping up, when the heating turns on, pressure sky rockets to 4+bar, after the heating is off, pressure drops down to below 1 again. Now everything makes sense thanks to this video!

Couple of things I do. 1. Prior to fitting the hose connection to the schraeder valve, I fill the opening with petroleum jelly, never had one leaking after topping up. 2. As you say different manufacturers state the setting pressure, for example 0.75bar. Now I’ve found particularly on the Baxi if you set the system pressure to 1 bar, when there’s a demand and the pump runs the system pressure drops and sometimes the low pressure error message appears. To stop this I set every boiler to 1.5bar and inflate the expansion to 1.5bar, this ensures the low pressure fault doesn’t occur and the expansion vessel diaphragm is centred within the vessel to ensure the maximum expansion volume.

Thanks Allen,I've done this operation three weeks ago.

I use a Regin detonator style pump like what Roy was using - don’t use any extensions apart from when I really need to. A good tip is to use a dab of silicone grease before and after and use a bit of spit (rather than LDF which can affect the rubber) on the schrader valve connection after pumping to check for leaks. Some people tend to also leave the pump connected at a certain pressure and go and have a coffee to see for potential drops over 5 mins without any water back in - this proves that there is no seepage in the diaphragm. Nice little video Allan and Roy, as always. 👍🏻

Great help that mate. Thanks. Even the little things like twisting the drainage tray around!

Hi Al....I have a manual Regin pump and a battery operated Makita too. Thanks again for sharing your knowledge 🧠🧠

Nice video Allen. I use the Regin foot pump, but of late have bought the Makita DMP 180 Tyre inflator battery operated. Alot easier and faster than a foot pump! Love the schrader valve tool. Only recently found out about it!

Great Video Allen, Defo want to see the skipping with the pump too on another video ;) keep up the good work

crackin advice on these vids magic

Keep up the good work Al 👍👍👍👍✔️✔️✔️✔️💎💎 Geezer

Great content !!

Should there be water coming out of the top up valve when you press the valve nipple in on a Viessmann Vitodens 100 ?

Thanks, topic well covered.

Hi Allen, I saw you doing a video on press fit fittings on meter tails and you were waiting to hear back from the manufacturers of the fittings!!, Did they get back to you to confirm?, Keep up the good work mate?, Cheers.

can u recharge the expansion vessel without taking it off from the boiler? or you can just check air pressure and fill some more air will do the job? I normally put new expansion vessels lol thanks in advance

I can't find a drain valve on my baxi ecoblue 28, can I just drain from radiator fully, then check pressure also I'm gonna need to pull out my vessel to pump it up cos valves in tight position

1. When I release the water pressure from the boiler to pump up the vessel, does the air get into the heat exchanger? 2.If the water release valves happen to be on both ends of heat exchanger, does it matter which one I use to drain the water? It could matter in my opinion because the air release valve is only on one end, next to the pump, and I don't like the air in the heat exchanger. 3. when I put the water pressure back in , should I direct the water back towards the air release valve (by adequately turning off valves underneath the boiler if they are available)?

say if you are filling the air side of the expansion vessel, and the water side "kicks" up to 2 bar (although radiators valves opened) it could be dirt on the water side of the vessel ...