Posted on: January 20, 2017 by in Plumbing Videos
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This video covers the basics of shower pumps and in particular, twin impeller shower pumps for hot and cold water. We show you how they work, how to install one and what is best practice. We include Salamander, Grundfos and Watermill.



We’ve got to go and change a shower pump for a lovely customer of mine. Yeah, what we gonna do is basically change over a shower pump. It’s the perfect opportunity for us to revisit one of the shower pump videos we’ve done in the past. And so we’re gonna do that now, just go over it, go to the whiteboard, have a look at how they work. So here we are up in the loft, this is where the loft tank is. Also the hot water tank’s up in here, which is kind of unusual, but not really, but also, it’s really easy for us to come and look at the defunct shower pump that we’re having a look at today. It’s just around the corner
behind this stuff here. So let’s go and have a little look. So, here’s the shower pump we got here. As you can see they’re nicely marked out where our cold inlet is, and our cold outlet is, and where our hot inlet and our hot outlet is. Also, these roll-on flexies here, which makes it nice and easy for us to change so this really shouldn’t be too difficult a job. And while we’re here, we can have a good look at actually how this system works. So, number one, right at the top of this system we’ve got our cold tank. Now, this cold tank feeds the
cold water down to our pump, just down there, but it also feeds cold water into the bottom of our tank to come out of the top of our tank heated, and then off to our pump just down here. The importance of this is that then the gravity pressures are pretty much exactly the same on each side of the pump and then it’ll be able to get an accurate reading on each side of it’s pressure switches. So, if we have a quick look here, we can see that someone has tee’d off the side of the hot water just here, and put a valve in here that we can now valve off. So, now that’s valved off, we know that the hot water feeder by down to our pump down there is switched off.Also, we’ve got our other pipe here. This is our cold feed. There should be a valve in here somewhere, and that’s just there, and I think that should be off now, as well. So, I’m about pretty much ready to wet this out. Of course, before you do anything, make sure that it’s fully electrically isolated. If you’re not happy with doing that at all, whatsoever, make sure you get an electrician in, someone qualified to do that sort of work. Now let’s quickly pop back to the office, where I can give you a schematic diagram on a whiteboard, yeah? So, you get a great idea about how these work. So, let’s just go over what we’ve been gopping at in the darkness and spider-infested filth of Paul’s loft. Don’t worry, Paul, everyone’s got a loft like that. So, we’ve got our loft tank right at the top, okay. Now, usually this tank will feed both the hot water tank, and also the gravity cold water feed to the shower you’re looking at. Alright, so, you have your cold water main in, the little ball valve up there, and really, we got to make sure about when thinking about if you’re gonna install one of these, is whether this tank’s gonna have enough water to serve your shower pump, and whether your cold water main’s gonna have enough pressure in it to keep that top tap so it can keep on serving it.So, out of the bottom right, we’ll have,let’s just say out of one side, if you’re gonna do this properly, you’d have this go in to the bottom of your hot water tank, okay? And then it will come out of your hot water tank heated up. Now, this should be a red pen. So, it’ll come out of that heated up, okay? And that also, you’ve got another cold water feed coming out, okay? Now, when your pressure hose is in a shower valve, what you want to do, is you wanna draw that cold feed into your new pump and you also want to draw that hot feed into your new pump. So, then you’ve got your shower pump here, like that, and that then goes off and pumps your hot and cold off to your shower valve, where it then gets mixed and comes out of your shower head and flies all over your body in a fantastically, beautiful way. So, that’s just to reiterate, we’ve got our cold water coming out here, gravity-fed from our tank. We’ve got the cold feed going to the bottom of our hot tank there. And then, we go into our shower pump unit just here, where that is gonna go in like so. And then obviously our hot water heated out of our tank will come in here, come into our shower unit,go into our shower pump and go out like that. Obviously, I’ve drawn these coming out the bottom of the shower pump, ‘cos it’s a schematic drawing. Usually they come out of the top or out the sides, okay.

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