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How Condensing Boilers Work - Plumbing Tips
WEBVTT Kind: captions Language: en
00:00:00.030 hello and welcome to this week's poorer 00:00:02.06000:00:02.070 parts doctor at UK video today I'm going 00:00:04.61000:00:04.620 to tell you all about condensing boilers 00:00:06.61900:00:06.629 for the purposes of today's video we're 00:00:09.02000:00:09.030 going to use the Grant vortex combi 00:00:11.12000:00:11.130 condensing boiler this is the outdoor 00:00:13.10000:00:13.110 model as well all I'm going to show you 00:00:15.32000:00:15.330 in this video is the burner at the 00:00:17.72000:00:17.730 bottom the primary heat exchanger and 00:00:20.59900:00:20.609 the secondary condensing heat exchanger 00:00:23.42000:00:23.430 the first thing you should know when 00:00:24.71000:00:24.720 comparing a condensing boiler to a 00:00:26.48000:00:26.490 standard conventional boiler is that the 00:00:28.82000:00:28.830 heat input is very much the same at the 00:00:31.07000:00:31.080 bottom roughly 250 to 350 degrees C this 00:00:35.81000:00:35.820 is the burner that we're just going to 00:00:37.13000:00:37.140 pop out at the bottom now this part here 00:00:40.09000:00:40.100 is what inputs the heat at the start of 00:00:42.88900:00:42.899 the heating process this burner here is 00:00:45.56000:00:45.570 likely to be fitted with a small nozzle 00:00:47.60000:00:47.610 that atomizes the oil much like putting 00:00:49.49000:00:49.500 your finger over the end of a hose has 00:00:51.50000:00:51.510 two electrons that like that oil and 00:00:53.38900:00:53.399 that's what inputs the heat into the 00:00:55.91000:00:55.920 combustion chamber and the heat 00:00:57.65000:00:57.660 exchanger for transferring heat into the 00:01:00.17000:01:00.180 water now I've got the burner out we can 00:01:02.15000:01:02.160 have a look at the primary heat 00:01:03.43900:01:03.449 exchanger to do this we move this front 00:01:05.50900:01:05.519 panel just so first we have the primary 00:01:12.53000:01:12.540 ez exchanger which is set up with a 00:01:16.58000:01:16.590 group of baffles all slide out and they 00:01:20.21000:01:20.220 need to be cleaned the burner flame is 00:01:22.13000:01:22.140 down in here so hot air which is heated 00:01:24.05000:01:24.060 up on the burner at the bottom goes 00:01:25.67000:01:25.680 through these convective fins and tries 00:01:28.94000:01:28.950 to keep the heat in this area for as 00:01:30.28900:01:30.299 long as possible to allow the hot water 00:01:31.91000:01:31.920 to take heat away and off to the 00:01:34.64000:01:34.650 radiators let's take a closer look at 00:01:36.98000:01:36.990 the primary heat exchanging baffles of 00:01:38.99000:01:39.000 this boiler right so here we have the 00:01:41.45000:01:41.460 primary baffle area just here they 00:01:43.60900:01:43.619 remember most spoilers especially quite 00:01:45.71000:01:45.720 old ones the baffles are really just a 00:01:47.99000:01:48.000 metal plate usually just about three of 00:01:50.14900:01:50.159 them they're a sigh angle one two three 00:01:52.73000:01:52.740 and then that flue gas goes off out to 00:01:55.42900:01:55.439 atmosphere never to be gotten back again 00:01:57.08000:01:57.090 often about 250 degrees flue temperature 00:01:59.92900:01:59.939 having a look at these here this is only 00:02:01.60900:02:01.619 the start of the heat exchanging 00:02:02.81000:02:02.820 possibilities so firstly the hot gases 00:02:04.76000:02:04.770 come up through here round here up 00:02:08.24000:02:08.250 through this small hole here 00:02:10.56000:02:10.570 like so goes round around this part here 00:02:15.24000:02:15.250 up there and is again forced around 00:02:20.82000:02:20.830 another area and here on the back here 00:02:26.02000:02:26.030 up here around here and then finally out 00:02:30.67000:02:30.680 the front right then goes up to the 00:02:32.98000:02:32.990 condensing chamber you have two columns 00:02:35.53000:02:35.540 like this so straight away without there 00:02:37.51000:02:37.520 even being a condensing part the actual 00:02:39.46000:02:39.470 standard primary heat exchanger is 00:02:41.80000:02:41.810 already my was more efficient because it 00:02:44.08000:02:44.090 keeps the heat in there for as long as 00:02:45.31000:02:45.320 possible to allow the water a chance to 00:02:47.50000:02:47.510 collect heat from that and take it off 00:02:49.44900:02:49.459 to the radiators so he cut us out of our 00:02:51.97000:02:51.980 two little holes at the top goes round 00:02:53.89000:02:53.900 through this condensing area each one of 00:02:56.35000:02:56.360 these tubes points downwards and has a 00:02:59.32000:02:59.330 small spiral fin that goes down the 00:03:01.66000:03:01.670 middle as it condenses it goes down 00:03:03.94000:03:03.950 causes condensed droplets the contents 00:03:06.40000:03:06.410 itself is taken away in there in a drain 00:03:09.46000:03:09.470 and disposed off safely so that's the 00:03:12.10000:03:12.110 first major difference between the 00:03:13.30000:03:13.310 conventional boiler and condensing 00:03:14.68000:03:14.690 boiler most condensing boilers are going 00:03:16.81000:03:16.820 to be more modern and they primary heat 00:03:18.58000:03:18.590 exchanging area at the bottom is gonna 00:03:20.38000:03:20.390 be better designed and have much better 00:03:22.81000:03:22.820 capability of taking heat away into the 00:03:25.57000:03:25.580 water and off to your radiators secondly 00:03:27.49000:03:27.500 you have obviously the top part that is 00:03:29.97900:03:29.989 the condensing chamber how they work 00:03:31.99000:03:32.000 that's different 00:03:32.83000:03:32.840 most conventional boilers have a fly 00:03:36.13000:03:36.140 that comes out the top of the burner and 00:03:37.63000:03:37.640 a return that comes in at the bottom 00:03:39.28000:03:39.290 because generally the bottom is colder 00:03:40.96000:03:40.970 so cold water comes back from the 00:03:43.00000:03:43.010 heating system in the return is heated 00:03:45.46000:03:45.470 up through the chamber and then goes out 00:03:47.31900:03:47.329 through the float back off to the rads 00:03:48.85000:03:48.860 that doesn't happen with a condensing 00:03:50.77000:03:50.780 boiler the return goes into the 00:03:52.84000:03:52.850 condensing chamber first pick out latent 00:03:55.39000:03:55.400 heat from the flue gasses then it goes 00:03:57.67000:03:57.680 in at the bottom of the primary heat 00:03:58.96000:03:58.970 exchanger and out so effectively you 00:04:00.81900:04:00.829 have to the exchangers instead of one 00:04:02.47000:04:02.480 right let's just slow down for a sec 00:04:04.09000:04:04.100 okay well have a quick look firstly a 00:04:06.10000:04:06.110 conventional boiler so we have our heat 00:04:08.17000:04:08.180 input of 300 degrees at the bottom our 00:04:11.22900:04:11.239 standard baffles we have our return 00:04:13.44900:04:13.459 coming back from the heating system that 00:04:15.19000:04:15.200 water picks up that heat and goes out 00:04:18.13000:04:18.140 through the flow three degrees starts 00:04:19.90000:04:19.910 off around here and we lose about 200 00:04:23.64000:04:23.650 50 off the atmosphere out through the 00:04:26.12900:04:26.139 flue a condensing boiler as the same 00:04:28.56000:04:28.570 heat input of the bomb has more modern 00:04:31.14000:04:31.150 battles and condensing chamber on top 00:04:34.62000:04:34.630 this time the return comes back from the 00:04:37.52900:04:37.539 system into the connecting chamber first 00:04:39.74900:04:39.759 and picks up latent heat now the reason 00:04:42.93000:04:42.940 it condenses is if you imagine you 00:04:45.39000:04:45.400 breathing on a window on a cold day it 00:04:47.55000:04:47.560 will condense onto that window so as 00:04:50.31000:04:50.320 cold water comes back into this really 00:04:52.65000:04:52.660 hot area it will condense through here 00:04:54.54000:04:54.550 and a little condensed rain I'll take 00:04:56.12900:04:56.139 that off and safely dispose of it after 00:04:58.62000:04:58.630 going through this condensing chamber 00:04:59.96900:04:59.979 return flows down into the bottom of our 00:05:02.49000:05:02.500 primary chamber takes up this heat here 00:05:04.43900:05:04.449 and then goes off back to the system now 00:05:06.62900:05:06.639 this time our flue temperature will be 00:05:08.73000:05:08.740 about 55 degrees sin so that shows there 00:05:12.00000:05:12.010 you have the same heat input at the 00:05:13.29000:05:13.300 bottom as a conventional boiler but you 00:05:15.02900:05:15.039 save all this energy because so much 00:05:17.27900:05:17.289 extra heat is being extracted and put 00:05:19.46900:05:19.479 into the water that goes off to your 00:05:20.70000:05:20.710 radiators remember there are too much 00:05:22.86000:05:22.870 more efficient heat exchangers here even 00:05:24.99000:05:25.000 when the borders not condensing because 00:05:26.24900:05:26.259 sometimes when the return temperature is 00:05:27.87000:05:27.880 warm it won't condense it will always be 00:05:29.70000:05:29.710 a lot more efficient I hope you found 00:05:31.37900:05:31.389 today's video interesting and helpful if 00:05:33.99000:05:34.000 you think we haven't covered anything or 00:05:35.61000:05:35.620 you think we should have done something 00:05:36.93000:05:36.940 slightly better please do contact us on 00:05:39.02900:05:39.039 our YouTube and as ever don't forget to 00:05:41.33900:05:41.349 subscribe see you soon everyone have a 00:05:43.32000:05:43.330 great time why plumber parts code at UK 00:05:46.64900:05:46.659 honest reviews and advice
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