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What's Inside Your Gas Boiler , Heat Exchangers Burners and Gas Valves

WEBVTT
Kind: captions
Language: en

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please remember if you're gonna work on
gas you must be gassafe registered your
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My names on Allen Hart and today I wanted
to do a video of what's inside your gas
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central heating boiler so I'm gonna look
at heat exchangers today so I've got a
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few different heat exchangers here from
different boilers different makes and
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models of boilers so what I'm going to
do is I'm going to strip a few of these
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down set burners out and show you show
you inside and I'm just going to give
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you my opinion of different heat
exchangers and if you're going to choose
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a new boiler for your house what what
you what you would want really or what I
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would want if it were my own my own
house
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so yeah so let's have a look now so
first of all we'll have a look at this
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heat exchanger here so this one this is
an idea logic boiler so this could be a
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heat only it could be a combi and how
this would work so just give you a brief
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idea of our heat exchanger works is
you've got your gas valve so you gas
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comes in here and then it goes up into
the fan mixes in the fan and then this
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one's got a downward Fersen burner on it
so I'll flip that down and I'll show you
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inside and you can see you know see I
have an idea about work trailer and then
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I'll show you some other ones as well so
we've got all different models here so
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this heat exchanger here is that of a
these 'men boiler we've got one here
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this one's out of a boxer similar heat
exchanger in valent boilers as well
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we've got we've got what's the Bosch
heat exchanger so this is out of a CDI
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so this is the flagship boiler from
Worcester so this is an aluminum heat
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exchanger and then we've got another
heat exchanger from Worcester so this is
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the junior range and this is Anna Warner
is aluminium heat exchanger then we've
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got burner so that's a that's just a
burner however a boiler and then this
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one here we've got player
exchanger and then finally here we've
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got another aluminium heat exchanger so
this is out of something like revenues
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are some of the Vaqueros of the see
exchanger as well and some some
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different models of bible as well but
what i look at all of them have a look
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inside so no so if this was inside the
boiler would take these two screws out
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here and then on these boilers so this
is the idea logic when we take these two
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screws out of here we would be looking
to see if the sump is correct we'd also
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be looking inside the KS before but the
sump cracks usually it's about here on
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this boiler and then all we'd do is we'd
push these up and that goes into wet
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flue girls and then you go like that and
then you just pull out this is oil so
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then we'd set the fan out on this so
we'd have to disconnect this pipe off
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the gas valve for that I just got
screwed just in here so I can remove the
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farm
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and then you found just lifts out thumb
comes out nice and easy the good thing
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about this heat exchanger is everything
con it is easy to work on it is a good
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boiler farm for be enough to get into
stuff to work on it and then we just got
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some bolts on top here don't need to
undo sorry about that
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schoolboy error so we just undo these
screws out of here if you have all to
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come there oh my there's one up back
there and just one there as well so I'll
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just undo them now and then I'll take
this off the top so I've removed the
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screws now and then that's your Emma so
you burn now you've got your gas and
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your air mixture goes onto there and
then that heat then goes down them the
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heat exchanger down there
and then you put your water that's
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inside that heat exchanger you've when
you floor with turn pipes so you've got
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a little pipe on one side and one pipe
on the other so that's the the water
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that goes around it so while we're
looking at this heat exchanger I might
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as well show you the Sun so I've just
removed the gas valve off the front
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there and then we've got the Sun here so
if you don't ever need to change this
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sump you've got some clips on there and
then Evol flip from clips on the back so
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the reason this is a bit hard to get off
is this there so if you ever did need to
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change the stump then if you won't do
these screws a little bit you can get
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this sump off a bit easier but then
you've got some clips on there you just
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pull them clips down and
simple come off on this I can show you
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inside so that's your sump and then you
should pass a sale like a rubber seal
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there as well but that's what's inside
these boilers and then just to show you
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inside
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so the next boiler or the next heat
exchanger we've got these out of of
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easement by Allah so this is a stainless
steel heat exchanger and this heat
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exchanger has one continuous coil so
you've got a connection on there on this
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particular boiler it were a rubber hose
then you've got a still a steel coil
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around the inside and then it's got
rubber whores at the back so with this
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we've just got some screws here to
remove and then that will come out so
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again with this we've got the gas valve
and the fan so on this one it should
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connect it together but it works more or
less the same as the ideologic and it
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goes into there and it goes into the
burner and then insane so what I look
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inside this now so that's here these
Minh burner look on there there's a bear
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standing on there so I would suggest
that this hasn't been serviced very well
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and it's blocked up and bucked up in
past so I live look inside heat
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exchanger now I'll show you inside so we
can clearly see inside and it's not
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being serviced very well this
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so I'm like in there so with this one
you have your burner in in the middle
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here so where's the burner so you burn
another and it fires all the way around
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so you heat exchanger all the heat goes
round
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well Oh in here and then these pipes
here these are still are still and these
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are all squash together inside so you've
got one continuous coil all the way
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through the heat exchanger if you do
have a problem with the system being
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closed up then they say two exchanger
because it's one single pipe you can
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almost always claim these then good
feelings well about this there's no sump
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so you're not gonna get sump that's
gonna crack they are out of kissing this
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stainless steel as well that's just
that's for your flow so that's where
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your flue gases would come out of I'm
not see really that's your these Minh
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heat exchanger so next we've got a
cement ER heat exchanger so this heat
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exchanger is in quite a lot of
manufacturers boilers so your ideal
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vogue has one that's very similar to
this yeah valence they have a very
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similar heat exchanger to this on their
higher quality boilers your buck sees
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men's and patents
there's quite quite quite a large number
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of manufacturers use it so multipaths
heat exchanger which means a stainless
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steel but it's got as the pipes go in it
as it splits so it goes round in
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different different parts of the coil
the only issue you could possibly have
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with that is if you pull it on if you
put it on to a dirty system and it's
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closed up then there may be an issue
have been able to flush it out after I'd
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never experienced that if I'm honest
we're
00:10:51.700 --> 00:10:55.810
I have been to quite a few valence that
have been closed up and I've always
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managed to clean them out after so but
yeah people say that that's that can
00:11:02.080 --> 00:11:07.350
happen so if they say it can happen it
can happen mmm so I'm looking this again
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we've got as gas valve would be on pump
and then we would have us fun here and
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this is all built in again and then we
just got some nuts on here so just don't
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do these under these four nuts and then
inside this again this has been out
00:11:35.820 --> 00:11:40.990
already
Oh insulation panels my stuff on this
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one so unless you've got a seal down
there so if you're gonna service these
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obviously check them seals but that
works in a similar way to the last
00:11:51.730 --> 00:11:59.770
boiler these men want so flames come out
all the way around and then I'll just
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show you inside now
so this one's been just thrown about and
00:12:04.570 --> 00:12:10.630
smashed to bits to be honest sir but
again this works in the same way as the
00:12:10.630 --> 00:12:18.010
basement really but as I said these
coils these are multi paths
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so it's not one continuous pipe like the
visible mums but as I say if it's on a
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clean system then that wouldn't matter
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I'm gonna try and speed up a little bit
now cuz this video is taking a bit
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longer than what I expected
so this is your worcester heat exchanger
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so this is your CD a range of heat
exchangers this has been quite a
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reliable heat exchanger to be honest I
have seen a few of the years that are a
00:12:51.040 --> 00:12:58.300
problem splited I'm not a lover of
aluminium heat exchangers as a rule this
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is probably one of the best of humidity
exchanges
00:13:02.050 --> 00:13:09.970
on the market so I always work says
downward-facing so top comes off which
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is a little bit awkward to service
you've got a tip top of the boiler off
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to get into it so it's a bit it's a bit
more tricky then the other ones that
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we've seen so yeah and then inside that
we've got the burner girls and then on
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this again we've got a sump bottom of it
which you can clip off if it's it by
00:13:41.769 --> 00:13:46.560
Allah they can be a bit bit awkward to
go after the favour
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you're not stuck heat exchanger so
that's the sump on the worcester bosch
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boiler and again sometimes they slick as
well they're plastic stumps the plastic
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so sometimes the we're now over time so
if you're going to service this you you
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clean it from top also you tip this
panel off on here so you've got some no
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bolts on there and you just don't do
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and I'll just show you inside in that so
you can get a cleaning tool from
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Worcester to clean these out so that's
the inside if we've got this viewing
00:15:19.090 --> 00:15:26.200
glass here then it's a good idea to
change that what my doctor they said
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that you have to but sometimes these can
set on fire so it is a good tap is a
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good idea just to swap that if you count
so that's you what's the boss for CDA
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heat exchanger
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so now we've got the what's the Bosch
heat exchanger so this is in your
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juniors and and the cheaper boilers if
you like and I call this kebab a lot of
00:15:59.350 --> 00:16:05.080
people call it the kebab exchanger as
you can see there it's it's gone all
00:16:05.080 --> 00:16:12.070
ripped on there so how this works is as
a gas valve which is connected by a
00:16:12.070 --> 00:16:16.420
plastic pipe sometimes in plastic pipes
can split so just be very careful with
00:16:16.420 --> 00:16:22.990
them it goes up into here again and then
it's fired down into the heat exchanger
00:16:22.990 --> 00:16:28.920
in there I don't think that this is a
very good design in my personal opinion
00:16:28.920 --> 00:16:35.610
it's quite awkward to service um
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sometimes they've got puffles inside
here and sometimes they sometimes it's
00:16:41.410 --> 00:16:44.350
hard to get them out so what I'm going
to do is I'm going to take this off and
00:16:44.350 --> 00:16:49.450
we'll strip it down and I'll show you
inside this as well also this has got
00:16:49.450 --> 00:16:58.060
another plastic sump on the bomb on this
so let's have a look at this one now so
00:16:58.060 --> 00:17:06.339
this has just got a 13 mil bolt that you
come and do now this is a little bit
00:17:06.339 --> 00:17:13.199
more tricky when it's inside the boiler
but it's easier to show you on a video
00:17:13.199 --> 00:17:44.610
check it out so we match the clicks out
so that comes out one complete unit then
00:17:44.610 --> 00:17:51.550
and then you can take the top off let's
play it out for you we need to take
00:17:51.550 --> 00:17:56.400
these off so I'll do that now
00:18:04.340 --> 00:18:10.230
so if you put this if you put Neal seal
in these sometimes this player can be a
00:18:10.230 --> 00:18:16.350
bit awkward to squeeze back in
afterwards if you're going to take all
00:18:16.350 --> 00:18:24.840
this off I would always replace the seal
and replace the electrodes as well we
00:18:24.840 --> 00:18:27.529
just see on there
00:18:44.539 --> 00:18:49.460
inside again
00:19:34.940 --> 00:19:44.880
so this heat exchanger
I've actually been leaking you see and
00:19:44.880 --> 00:19:49.460
then you just see down there so
obviously if this is inside the boiler
00:19:49.460 --> 00:19:55.320
getting down into that he's a lot more
difficult than some of their boilers
00:19:55.320 --> 00:20:02.549
like this where you can just get
straight into the burner so like I say
00:20:02.549 --> 00:20:10.200
in my opinion these are not really good
designed so next we've got a plate heat
00:20:10.200 --> 00:20:16.049
exchanger so this is a water water heat
exchanger and this are one of these
00:20:16.049 --> 00:20:20.610
something like this were being almost
all these boilers that we've seen most
00:20:20.610 --> 00:20:29.190
combi boilers whatever plate heat
exchanger so what that does is it it
00:20:29.190 --> 00:20:36.090
transfers the heat from the main floor
returned to the central heating water so
00:20:36.090 --> 00:20:40.710
one of these and be cold water going in
from your cold mins and then it would
00:20:40.710 --> 00:20:45.140
come out as hot water and then one of
them would be floor
00:20:45.140 --> 00:20:50.480
and one of them would be returned round
your heating circuit around your boiler
00:20:50.480 --> 00:20:55.610
if you like and then what that does is
there's loads of plates in there and it
00:20:55.610 --> 00:21:01.610
transfers the heat from one body of wire
to the other body of water and then you
00:21:01.610 --> 00:21:07.000
can get hot water coming out your top so
if you have problems with a boiler
00:21:07.000 --> 00:21:11.780
sometimes where the hot waters not very
good then it could be that the plate
00:21:11.780 --> 00:21:15.740
heat exchanger is blocked up
so it might need system might need
00:21:15.740 --> 00:21:20.030
flushing you might need a new heat
exchanger then it could also be all
00:21:20.030 --> 00:21:22.460
things as well
but that's that's one of the common
00:21:22.460 --> 00:21:31.310
causes if like so as I said this is this
one's out of a villain that's a plate
00:21:31.310 --> 00:21:37.250
heat exchanger so now it goes so this is
the last last one that we've got in
00:21:37.250 --> 00:21:44.570
today's video so this is for this is an
aluminium heat exchanger again this is a
00:21:44.570 --> 00:21:49.400
downward facing burner this burner is
connected directly on to the heat
00:21:49.400 --> 00:21:54.260
exchanger that actually makes that
despite a very very quiet so when this
00:21:54.260 --> 00:21:59.300
is running this boiler you can hardly
hear it running so that's one good
00:21:59.300 --> 00:22:05.750
benefit with this boiler the downside to
that is it's a little bit awkward to to
00:22:05.750 --> 00:22:11.270
service you've got all these screws on
here so what I'll do is I'll take I took
00:22:11.270 --> 00:22:15.440
this screw that top will strip it down
and then we'll have a look inside it
00:22:15.440 --> 00:22:21.710
this this one also has got some hot
bottom and it's a plastic sump again so
00:22:21.710 --> 00:22:26.630
as we've seen what the others plus it's
sumps do you know the the out what they
00:22:26.630 --> 00:22:32.720
are really I'm not a lover of any boiler
that's got pluses sump I'd rather have a
00:22:32.720 --> 00:22:42.070
stainless steel heat exchanger if
possible so that's the Sun from this one
00:22:43.340 --> 00:22:46.399
and then it's just got pipe that comes
off bottom there
00:22:46.399 --> 00:22:56.929
fuck comment set to come over sometimes
these crack fucker there as well so to
00:22:56.929 --> 00:23:04.669
take the fun out on this heat exchanger
thus far squeals just tip these screws
00:23:04.669 --> 00:23:13.149
out and then you can do them just goes
00:23:26.200 --> 00:23:31.850
and then we'll just undo these on top
and then we can have a look inside it's
00:23:31.850 --> 00:23:46.210
a burner so I'm guessing this one
opening service since it goes down
00:23:52.549 --> 00:24:04.919
so that's the burner if you look inside
the heat exchanger and clearly see
00:24:04.919 --> 00:24:19.850
that's not being serviced thank you for
taking the time to watch my video

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