– Hi, guys, James here
from Today we're going to be having a look at deaeration devices. We're gonna be doing a few videos on these over the next few weeks. This particular one
here is pretty much used on gravity-fed systems in the UK. They're a very, very common
type in this country, but there are types of way
that you can deaerate a system. We thought we'd start with
the basic version first, okay? So we're gonna look at
this little beast here. Please do subscribe to
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– [Voiceover], home of Find Your Plumber. – Come on, sorry, it's
brass monkeys out here. I don't know if you can
actually see my breath, but it's freezing cold, and being English, I've got
a lovely brew on as well, so that's always good. So, then we're gonna have a
quick look at one of these.

This is not gonna be a very long video 'cause these are really,
really simple bits of kit. We saw one of these a
few days ago on a job, and I just filmed it
quickly on my camera phone. We'll add that into this
video somewhere along the way, so you can actually
see what it is in situ, but I thought, well, tell you what, they're really, really cheap, let's go see the suppliers, buy one, and then show you exactly how they work. So, what these do is
basically deaerate any air out of the system water of a heating system. Now, it's very important
to not have any air at all in a heating system, or at
least to a complete minimum, because it affects how
the heating system runs.

It can get airlocks, problems with flow, it can upset radiators, pumps, boilers, it's just bad news, so we
don't want it in there. So used in conjunction
with a decent inhibitor in the heating system,
which is gonna stop you from creating air in the first place, we're gonna get one of these in as well and instal that on the system to make sure that any air that's in the heating system
can leave it nice and easily.

So, let's have a quick
look at what this is. So here we go, this is
basically our beast here. Now, to show this installed
in the proper way, what we'll do, we'll draw a
little diagram in a minute, but first thing's I wanna show you is how simple these are on the inside. Firstly, I don't know if you can see that, but you should easily be
able to just see in there right at the moment, right? So first things first, you can see light through this pipe here going in, you should be able to see a little bit of light
going in there as well.

So what we're trying to say is there's no hidden secrets in this particular deaeration device. All this is, is a little
tub, like the size of a cup, with a pipe in here, a pipe out there, and a pipe up out of here. So that's it, they're simple. But James, how do they
actually deaerate the system? And where do they fit in the system? Well, it's a very, very
good question, Tarquin.

What these do, let's
get the old board out, oh man, this has been on here a while. Nothing that a bit of
spit can't fix though. So let's lay our beast on here, and we'll draw the system out around it. So this is generally how these work, we can have our flow coming up here from the boiler, that's
gonna go in here like so, like that, flow coming
in here nice and hot.

Now this pipe here is
our expansion pipe, okay? Now some people also
will tear feed into this, which is a little bit naughty, but there are other versions of this that we're gonna show you in a minute on the actual site that has the feed built into this whole unit. So you have the expansion there, so that's where our air is gonna go in a minute with any luck, and then we have our feed out, and generally what that
will go into is the pump, and then off to whatever you've got, your two-port valves, or
your three-port valves, so that's it, okay? So the idea is, you've got air coming up
here that we don't want.

This is in the moment when
you fill the system up. I mean, usually, once
these have done their job, they just sit there and
just allow for expansion. Now the thing is it's very difficult for us to get rid of air
out of a heating system if it's just rushing through a small pipe 'cause it's staying at a high speed, really quick, just flying through, and if we've got a vent that's just a T or something like that, say we T a little vent in there, it's not gonna have the chance. It's gonna rush past, and
we're gonna miss a lot of air, and that's gonna carry on
into the heating system and out of the way, so we're gonna expect it
get up our expansion pipe. So how do we slow that water down without actually slowing it down, if you see what I mean? So what we do, we expand
the amount of area that that water's in. So, we've got this size here, this is the size of pipe we've got here, just like that at the moment, that's the size of area, okay? But we introduce it to
this large area here, this is a larger area.

See, it's like a water break that doesn't reduce the
flow around the system. So you've got this water break here, the water just sits in here, and it has just a few seconds
to sort of swirl about and then go off back out. And in those few seconds
that it's in there, it can get rid of its
air up this pipe here, and up to the expansion,
and out of the way. That's all this is doing here. So, so simple. So we have this air comes in, rushes in, it's kinda slowed down a bit, we get rid of it up here, air out of there, so
our flow can go off here round the system and be
completely deaerated, and you notice you put
the pump on this side, that's so the pump isn't
affected by any air, so it's deaerated water coming in. Sometimes you might have an issue with the expansion pipe. If the crook's not high enough, it's gonna suck a little
bit of air down here. But hopefully, because of this break here, that's not gonna happen.

You can instal the pump here if you like, but to be honest, most companies don't
recommend that you do that. So, there you go. You now know how one of these little deaeration devices works. Let's just pop over to
that little video I did on my mobile phone a few days
ago where we actually saw one in situ, have a look at this. So guys, sorry about the
lack of film quality, but I'm on the old phone camera here at the moment on site. Now as you can see,
what we've got up here, we've got the boiler mag that's kind of on the flow from the boiler, which isn't really great.

But this is the flow up here, have a look at that, and then we've got our
expansion pipe just there, so any water, any air,
coming up here will escape up that expansion pipe up to the tank before it gets to this pump. We've got the feed pipe back down from the tank just there, so that's exactly what this does, it's kind of a break. But for now, I've got to fill this lot up. My brew is getting cold now, thanks for that, by the
way, Jim, uh, James, me? Thanks, me. Mate, I've got a bit of a cough. So now you know what that
weird bulbous thing is sitting in your heating system
in your airing cupboard, like, what's that doing there? What does it do, do I really need it? If it's there, leave it there, okay? You can get problems with the feeds, where the feed joins into these.

You'll know if there's a problem because if you start
draining the system down, you'll notice that the ball valve in the F&E tank doesn't drop, and that's one of the most annoying things for a plumber, especially if you think, oh, I'm just gonna go to this quick job and change a radiator for someone, you start draining the system, and you don't hear the
ball valve start running, you know you've got a blocked feed pipe to the system, usually
it's just blocked up with sludge and poo because the system wasn't
inhibited properly.

And then, effectively, some guys will try and back blast it out using the cold feed, the actual cold mains from downstairs, like a tap, and then put
it on the radiator spigot. But a lot of blokes, to be honest, do the right thing and just cut out the bit of pipe that's blocked, try and stuff a screwdriver and actually get rid
of the debris that way. Ooh, anyway, I hope you've
enjoyed today's video. I hope it's given you a better idea about how these little beasts work, about how you can deaerate the system. There are many other ways of doing it. We're gonna look into automatic air vents and pressurised systems as well. I mean, you can have automatic air vents on unvented systems as well, there's nothing wrong with that.

It's just when you're near the pump, especially if you put the air vent on the suction side of the pump, you can get problems with the air vent like float dropping and
actually sucking air into the heating system. It's quite rare, but it does happen. So there's a few little different things that can go wrong, but it's so important that the
system is deaerated properly.

So, again, I hope you've
enjoyed today's video. I hope you've learnt a little bit more about how you can deaerate your system. Please do subscribe to this video by clicking on the link that's appearing right
now in cards, thank you, and please do follow us
on Twitter and Facebook because if you're not, then you're missing
out on stuff like this. (mournful music) Hello, my name's James
from, and I'm here today to ask you to donate just one or two turns, or at least a bit of thought, to your drain cocks this winter.

There are millions of
neglected drain cocks throughout the UK. And drain cocks like George, John. Also, we've got a lot
of new videos coming up. We're gonna be doing videos on how to, first, fix a heating system, and also a hot and cold system through timber frame. We're gonna be showing you how to lay shower trays, how to instal toilets, how to instal vanity units, do all the pipe work underneath. We've got a big project on at the moment, and that goes without saying as well, we've got the oil boiler to put in here at the shed for the little
office that we've got, and I think that's gonna be
a really good opportunity for us to show you how to different types of heating system work, we can just draw it out on the wall, and that'll give some of you apprentices a good idea about how S-plan and Y-plan heating systems work, how they're laid out, why there are certain components, where they are in the system because it's all laid out
in the same way mostly throughout the house, and if it's not, then sometimes it's not
gonna work properly.

Have a great week, guys. If you need any more help,
any more information, please comment in the
comments section below, and have a lovely time. See you soon, guys, hold tight! – [Voiceover], home of Find your Plumber..

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