- [Narrator] Plumberparts.
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- Hold tight, and welcome to today'splumberparts.
My name's James and todaywe're going to be having a very quick lookat the murky, dark worldof top-entry immersion heaters.
Now, this immersion heater here isn't working very well.
Or it's not working at all.
They basically found outbecause their heating system went mad.
They turned their immersion on as a backupand nothing happened.
Next thing you know, I'm getting a phone call.
Oh my God, we got no hot water.
Get Jimmy from Plumber Parts out here right now.
So here I am.
So basically the procedure that we go throughwhen we change an immersion heater isto firstly isolate electrically the immersion heater.
Make sure that's done.
If you're not happy doing thatthen I suggest you don't even carry on with this joband get a proper real plumber like meto come out and do it.
The next thing we need to do isturn off the cold water supplyto the bottom of the hot water tank.
Then we drain down the hot water at the top.
We can do that firstly by openingall the hot taps in the house.
And then secondly, by finding the drain offat the bottom of the tank.
Now because this is a top-entry immersion heaterall we'll need to do is drain outa couple of litres out of the whole tank itself.
Also, I'd say as a small tipis to try to try and loosen off the immersionwhen it's full of water, okay?'Cause that water tends to stabilise the copper tankbecause they can be prone to rippingbecause you've got a very fine, thin copper wallthat's holding the whole tank together.
So do that first.
Make sure then that you drain off about five to ten litresworth of water.
You should know that it's drained out okayif you crack the nut on the outlet at the top.
You'll know then that everything's all right.
So anyway, if you follow us as we go along and do it,I'm sure you're gonna enjoy this as much as I ambecause this is the best job you could ever do.
Especially when you're round one of your mate's houses.
Hey, Dave?Anyway, I hope you enjoy this videoand it helps you out if you've gota top-entry immersion heater that's gone wrong.
So nice and easy when it comes to switching this off.
It's just on this plug here.
We can just unplug this plugand then we know that there's no powergoing into our immersion heater.
So if we take a closer look at the actual tank itself.
This here is our hot outlet, okay?So this is the hot water that's going out to our taps.
Obviously we've got our immersion heaterat the top just there.
Down here we have our flow and returnfrom the coil of the boiler.
So there's our flow there and that goes through a coiland then back out.
Nice and simple.
A little bypass valve down there.
But then the bit that we're worried about at the momentis the cold feed.
So we have our drain off just here, like so.
We follow this pipe up.
We should be able to see that we've got a big valve.
This one here.
So what I'm gonna do is turn off this valve here now.
You should now be able to open up all the hot supplies.
What that's doing at the moment is draining outthe expansion pipe up to loft.
Now as you can see that's pretty much stopped running now.
At this point if we find that this is still dripping here,you've probably got a problem with that valve there holding.
Therefore you might have to turn the mains off,open that valve up fully againand then basically drain the whole tank out.
Alternatively, if you have the facilities,you can actually bone the tankbut you need special bones to do that.
And if you're here watching the videoabout how to do an immersion heater,you probably don't have those tools with you.
So, as you can see this is still running a little bit.
We're just going to open up a few more tapsand if we've got a problem with that valve,we'll address that now.
Right, so now we've got the water off.
We know that the valve's holding.
And basic now, the water level of the hot systemis about up to the top of the tank there.
Before you carry on,make sure that all the electric isolationthat you've done is okay, all right?Make sure that you use a voltage tester.
Make sure that you pull any fuses that could be nearby.
And also make sure that you identifywhat trip the immersion is onand throw that trip to the off position as well.
What we're now going to dois get our hose on the drain off at the bottom of the tankand get that into a bath or outside in preparation.
But we're not gonna open it just yetbecause what we're then gonna dois remove the electrical wire from the old immersion heaterand make sure that that's nice and loosebefore we start draining any water down.
(clanking)Now to loosen one of these offyou might find you need a myriad of tools.
I often find a nice set of stilsons help.
Obviously you can use the standard immersion spannerthat will fit over the top of the immersionnice and easily.
And I've got another type here.
You can't really have enough certain toolsto actually remove immersions.
'Cause once they're been in for a long time,being getting hot and cold all the while,they can get very, very tight.
So often if this one here doesn't come apart easily,what I do is sometimes get my blowtorch out,try and warm it up.
Or also shock it with the hammer.
Just tap round to try and shock apart the sealand then it should come apart nice and easily.
This is genuinely the most difficult partof removing a top-entry immersion heateror a side-entry one for that matter.
So I'm gonna do that nowand hopefully it's gonna come apart okay.
It's quite handy to have a towel for this bit as wellround the bottom of the tank just to catch any dripsbecause as soon as we've loosened it off,it might start to leak slightly.
Bet this doesn't come loose first time.
I'll be amazed if it do.
(James groans)As if.
(laughs)I often resort to stilsons quite quicklybecause they're got a nice amount of purchase along here.
Usually means it you can get a lot more forceon the fitting.
(cracking)Right, there we go.
You see, that's now nice and loose.
So now we straight away go down and open up our drain off.
Probably need a towel for this as well.
They lend to leak too.
So we've only had that going a few seconds nowso we should almost straight away be able to take this offand find that the water levelis just hovering below the big hole.
Look at that.
What a job, lovely.
Now's always a good time just to get a fileand just file off the old edge and clean this downready for your new immersion heater to go in.
This will help in a minutewhen it comes to the time of leaks.
(filing)And get that so we've got a nice flat, shiny face on there.
(filing)So now we've got our immersion offand we've drained down the tank,we've cleaned up that fitting.
It's basically a nice easy matter of gettingour new immersion heater ready to go in.
Most immersion heaters are suppliedwith a new gasket o-ring.
If you find that the one you get hasn't got this in it,you better take it back because someone's pinched it.
Now, this is a lovely, nice new floppy one.
Often what I'll do with theseis add some jointing compound to thatto make sure that we get a decent joint.
Also, to make sure sometimesI'll pop a little bit of PTFE round this thread as well.
Really you only want to do this once'cause it's just hassle trying to fit it all up again.
So I'm just gonna get this prepared nowand get it ready to go it.
(James sings)So now we're ready to go back in.
We're just going to feed nice and easily.
Our immersion should stay on here and then we're gonna startto screw that on there just like that.
That started perfectly.
Often they'll go on cross-threadedso you have to be very careful about how you screw these on.
And then basically we use our tools againjust to nip this up nice and lightly.
We don't need to over tighten this.
If we find that once we've filled it upwe've got a little drip herethen we can tighten it up a little bit.
(Groans)Right, so now we've got the immersion tightened up.
Usually what I like to do before we turn the water onis just cut a small amount of the foam away.
It's not gonna make a massive differenceto the thermal efficiency of this tankbut foam can sometimes disguise any small leaks you've got.
So it's more important now to find outwhether we've got any leaks than anything else.
So I'm just gonna cut that away as well.
(cutting)Right, so we've turned on our water and shut our drain off.
And we've turned off all the other hot taps.
As you can see, if we have a good look here,you should see we've got no leaks at all.
Excellent, so far we've got the water back on,we've got our immersion back in.
We've got it all tightened upand we know that there's no problems.
Basically we've gone in reverse what we did at the start.
Now, before you rewire it up and all that sort of stuff,I'd say just go off and have a cup of teaor a cup of coffee.
Just make sure for a fact that that small flangearound the outside of your new immersion isn't leaking.
'Cause sometimes it can take a few minutesfor a leak to appear.
Once you've had a cup of teaor you've watched the latest episode of The Chase,then basically I'd say is you followthe manufacturer's instructions.
You rip off the new head off your new bit like that.
And you'll find that usually all your connexionsare inside ready to go or they're sometimes in a little bagjust underneath the head like that.
Wire it up according to manufacturer's instructions.
When it comes to the wiring,most new immersion heaters are the same.
But obviously at the same time, check your instructions.
Here we've got our wire clamps.
Our wires are gonna pass through thisand get clamped up.
We've got our neutral terminal here.
We've got our earth terminal herewith an anti-vibration clamp on it.
And also we've got our live in herewhich will be switched with our thermostat just there.
So before I forget, I'm just gonna set our thermostatto about 55 degrees.
And now I'm gonna wire it up just like thiswith our earth wire here,our neutral wire nicely clamped hereand our live wire going around here.
And then we've made sure that it's all clamped thereso that can't be moved out of the way.
Pop the cover back onand make sure that that's all okayand only then can you plug it all back inand you should hear if it's cool enough in the water,a nice hiss from the systemand that should be the end of the job.
I hope you found today's video interestingand helpful and informative.
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- [Narrator] Plumberparts.
Honest reviews and advice.