HOW WET UNDERFLOOR HEATING SYSTEMS WORK – Plumbing Tips

Posted by in Plumber Talk, on April 27, 2017


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Boom! And welcome to today’s Plumberparts.co.uk video. I’m on site today. This is a site that we’re doing, hours is the bit we’ve been building. It should be great fun! And I’m going to give you a quick look today all about underfloor heating, okay?
So, as you may see, around us you got cellotex on the walls we’re actually in the basement here, about and a half metres underground, which kind of scares me. So let’s first see number, have a look at the basic components of an underfloor heating system. Boom!
So firstly as you can see we’ve got ecotherm absolutely everywhere. millimetre therm on here, and then what we do is, we actually lay out our underfloor heating just like this. Very, very easy indeed. So you have your pipes, each one of them gets stapled down by a small staple just like so. And today we’re gonna be putting in, we have a very nice company here, that makes you a nice little map for you to figure out. So, it’s actually really, really easy to do. Especially if you hold it the right way up, like that.
Next, you go into the darkness of this place So there we go, that’s a bit better. So now, what we can have a little quick look at this manifold here. We have our thermostatic controller on here and our pump that circulates water through our manifold flier and then back to our return. And then also, we’ve got gauges on each one of here to basically balance the system like you would a heating system. Because, obviously, if they’re not balanced, water will quite happily come up through here from the flow, go down this first loop and then back again, and not be forced to go around these loops here.
As you can see, we’ve got a couple of air vents on here as well that we’ll be using later on to purge the system. And, also, we’ve got our inner outlets for our boiler here and here. Once we’ve got the underfloor heating down on here, we’ve got the screwers coming in, and they’re going to screw a millimetre screw around the outside. Now, the principle is, is you use all these pipes that are zig-zagging around with nice, hot water through them so that you warm that solid slab of concrete up and that will stay warm through the day, and it gives them much more ambient temperature. There’s no cold spots in the house or anything. But the thing is, you don’t wanna be losing that heat into the wall or down into the floor.
Now we don’t have to worry about the floor because we’ve already got cellotex down, but, the thing is, around the wall we don’t wanna lose that. So, what we do is, we get this lovely sticky stuff here sticky back stuff, and we run that all the way around the wall, cut it around our little bits there and then run it around the room and basically that insulates the slab then from giving out its heat into the walls. So, once you’ve got all of that stuff going around then you’re pretty much ready to go and you’ve looked at your little map. You basically get metres of this rope, or whatever the stipulating part is for that bit of underfloor heating system. You look at your map, and then you start laying it out according to your map. On your own, this can be a pig of a job. Basically, so, I highly enjoy it, and there will be a little bit that we miss out on over there cause as usual, on site they suddenly decided to put a spiral staircase here and decided to tell me last otherwise I would put my pipes under it and then drill through them.
A lot of you guys know what that’s like, when people do that, change the goalpost, etcetera. I’ve a little box of premade up staples ready to start going. I’m going to put my headphones in, and I’ll see you later! Hold tight.
Right then, so as you can see that’s a complete nightmare to do. We’ve got our flow coming out of here, we’ve got our coil here, give ourselves a little back of slack as well. And we’ve got a small piece here for the silver to go on. So there’s our manifold there. Let’s get back to the shed and I’ll draw you a bit of a diagram so you get an idea about how these actually work. See you in a sec! – Woah! I bet you’re wondering what this man is doing In a Christmas jumper! Right, so in the grand scheme of things, these systems have the usual boiler with a pump. Basically, you’ve got the same as a zone in the heating system. So, lets say we’ve got our pump with a -port valve going up to our coil on our hot water tank, with a return going back to the boiler. Then we have, say, a zone valve for the radiators upstairs, in the house, by a line they go out to the boiler like that.

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