Posted by in Plumber Talk, on June 15, 2017

This video is all about the deaeration of heating system water. This in turn protects the pump and heating system components to maintain adequate function and flow. We show you where they fit in a heating system and how to diagnose if there is a problem with one. PLUMBERS REGISTER HERE:



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 our videos on YouTube and also follow us on Twitter and Facebook where we have very active accounts as well. And you can even follow us on Snapchat. But before we begin, remember, there’s one thing y’all gotta do, – [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 install 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.

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