Wetenschap en technologie

Forced-air Furnaces: The What, Why, and How

Let's not get too heated, this is after an inflammable subject. Frankly it's exhausting, but we gotta do it. We gotta explain how furnaces work! And soon, we'll talk about what will replace them. I'll try to remember to put a link here when that time comes!
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  1. Technology Connections

    Technology Connections

    21 dag geleden

    ***A fascinating correction about the flame sensor!*** It turns out that fire, as in literal actual flames, acts something like a diode. This means that the furnace is able to detect flames by putting an AC voltage on the flame sensor and monitoring for a voltage drop. The fire will actually conduct some current to the chassis ground of the furnace! This also allows it to detect if a flame has gone out mid-run. Pretty neat!

    • osmacar


      4 dagen geleden

      well fire is plasma, and plasma is conductive, in some way shape or form, and ngl, i'd love to go through tech things with you, well, for AFV's (armoured fighting vehichles... tanks, it's pretty much tanks and armoured vehicles)

    • Rango Konk

      Rango Konk

      6 dagen geleden

      Dude!! You need to talk about the A.C live wire detecting toys

    • Evan G. Srinath Das

      Evan G. Srinath Das

      7 dagen geleden

      In your closed captioning video, you mentioned TELLE TEXT. I would like to learn more about that. Could you please bring forth a video addressing this?

    • Scudmaster11


      7 dagen geleden

      love your videos

    • Cyber Corpse

      Cyber Corpse

      9 dagen geleden

      Why the hell don't you respond to my tweets. Do I not exist or anything?

  2. Trashkov


    6 uur geleden

    Sparky things went out of fashion because they are a point of failure. Your spark plugs in your car don't last forever, right?

  3. Richard Golden-DeWitt

    Richard Golden-DeWitt

    8 uur geleden

    I heat my entire home with electric 2000 Kw heat coils

  4. Danko


    11 uur geleden

    Is it my eyes, or is the image back focused? I can clearly see the background...

  5. William Griffey

    William Griffey

    19 uur geleden

    Matt Risinger could be a decent person for you to talk with about this series. He's a home builder youtuber does a lot of home air management stuff.

  6. Wesley Mays

    Wesley Mays

    22 uur geleden

    2:29 Technology Corrections

  7. Armand CooKerCat

    Armand CooKerCat

    Dag geleden

    The french part of the warning sign is a mess XD Thank's again for your work ;)

  8. Graham Sutherland

    Graham Sutherland

    Dag geleden

    I just wish they'd put a MOX gas sensor in boilers to detect CO and hydrocarbon buildup. They're so cheap these days that it seems like madness not to have one as a safety lockout. Atmospheric CO concentration above a safe level? Gas turns off. Atmospheric hydrocarbon concentrations above a safe level? No ignition.

  9. Caçador Curioso

    Caçador Curioso

    Dag geleden

    We dont have that Here in brazil ;-;

  10. Kurnma377


    2 dagen geleden

    1:35 Yo nice gaming PC, but cable management is a bit off.

  11. Tobias Letak

    Tobias Letak

    2 dagen geleden

    Alec! Thinking about energy efficiency, you should do a video (or series?) on earthships! They use tire and soil walls as a thermal mass and to provide cool air in hotter environments. They have a greenhouse area to grow food and provide heat during colder days. They catch rainwater and use it multiple times in different ways. They use solar panels to provide electricity. In terms of technology, I think they are fairly simple, but the combined effect of all these things is a very energy-efficient/zero-energy home. (They're designed to be "off-the-grid.") I am amazed by the ingenuity of the system, but I admittedly don't know a lot about how it all works. Hence, I'd be interested in having you do all the hard work of research so I can just watch an entertaining 25-minute video (or videos) about it. :)

  12. CountDuckula07


    2 dagen geleden

    TIL pioneer is owned by pepsi.

  13. Matthew Gribben

    Matthew Gribben

    2 dagen geleden

    Why is it American homes use furnaces where as European use central heating boilers?

  14. Carl Peters

    Carl Peters

    2 dagen geleden

    Next video: The main use for a comb :D (but seriously, I appreciate your videos)

  15. Shawn Bliss

    Shawn Bliss

    3 dagen geleden

    Pls never stop making videos

  16. Derek Zhu

    Derek Zhu

    3 dagen geleden

    I feel like this guy is also Captain Disillusion

  17. Daniel Houck

    Daniel Houck

    3 dagen geleden

    I donʼt know if this is what *you* mean by this, but I hear all of your promises to get to things this heating season as “and now Iʼve said that publicly, so Iʼll have to actually *follow through* on that”, and itʼs more for your benefit to make sure you do it than ours.

  18. GamingNinjaSheep


    3 dagen geleden

    How often does the thermostat call for heat in your house? As in, how often does the furnace start per time period?

  19. Ana Evangelista

    Ana Evangelista

    3 dagen geleden

    I just like his shirt

  20. vaikkajoku


    4 dagen geleden

    series of tubes. hello 2006

  21. Tributary House Ltd.

    Tributary House Ltd.

    4 dagen geleden

    Hey brother, I've found a strange correlate regarding your previous work on HPS lighting, I thought you might be interested: nlcameras.info/wiki/emqvgp2JuIq1roo/video&ab_channel=ShortCutsTv

  22. Farlig66


    4 dagen geleden

    Looking forward to the vid on heat pumps - living in Norway, a cold climate generally, the govt banned the use of liquid fossil fuel burning for domestic heating this year so we installed a ground source heat pump last year. We have a well drilled to 260m deep as the source. Last winter was not very cold so we didn´t get to thoroughly test it out...

  23. Robbie Steel

    Robbie Steel

    4 dagen geleden

    Ah yes, The Turbo-Charged Air Funaces! jk

  24. QuadCoreToothbrush


    4 dagen geleden

    Me: There's never anything good on yt anymore Technology Connections: What _are_ a furnace? Me: finally some good fucking content

  25. wisico640


    4 dagen geleden

    Where I live in NA we use mostly electric heating as far as I know (source of electricity is all hydroelectric)

  26. Devin Meehan

    Devin Meehan

    4 dagen geleden

    Living in florida i have no use for this information, im still gonna watch it though

  27. Gonzalo abel lecuna

    Gonzalo abel lecuna

    4 dagen geleden

    When I was a child I had a wind-up alarm clock. It was not very exact in the alarm time, minutes more, minutes less. and with that he woke up to go to school. The first days it was the heart beating from the noise, the whole house woke up. They are very interesting rock around the clock 🎼🎧

  28. Ass Hole

    Ass Hole

    4 dagen geleden

    I still use a Dearborn gas heater 24 hours a day in one room, with a slightly opened window in another for fresh air. Nothing like a warm backside after coming back in from the cold. CO detector next to heater.

  29. Noah Eldridge

    Noah Eldridge

    4 dagen geleden

    Absolutely CO monitors are necessary and inspecting the heat exchanger for cracks is important, but another safety feature is the static pressure of the blower fan must exceed the static pressure of the draft inducer, so that in the event of a heat exchanger failure, ventilation air actually blows into the combustion chamber and in a proper installation like yours, back outside.

  30. Christopher Parent

    Christopher Parent

    4 dagen geleden

    My central air system is older and uses a pilot light to ignite the gas.

  31. Alexandre Valiquette

    Alexandre Valiquette

    5 dagen geleden

    8:42 Why french translation sucks? "INSTRUCTION D'ÉCLAIRAGE PEUVENT ÊTRE SITUÉES DERRIÈRE LE PANNEAU D'ACCÈS CHALEUR" I mean... How can a multi million dollar compagnie cannot respect theirs customers enough to make sure the labels are ok???

  32. Malidictus


    5 dagen geleden

    I'm still surprised to learn of yet another way American homes still burn gas. The last gas-burning thing I owned was a propane stove that blew up in my face (well, formed a propane pocked that flashed in my face), which was replaced by an electric stove. That's not intended as criticism, so much as culture shock.

  33. Luka -

    Luka -

    5 dagen geleden

    "frark" is killing me

  34. Greg Akinson

    Greg Akinson

    5 dagen geleden

    You always have great and informative videos with a splash of humor........thank you so much!

  35. Jay Thomas

    Jay Thomas

    5 dagen geleden

    My parents have had a heat pump since their house was built 40 years ago. I didn't realize it was such a novel thing elsewhere.

  36. Kevin Yancey

    Kevin Yancey

    6 dagen geleden

    Heat pumps often require a supplemental heat source, either within itself or by means of a backup system, for the coldest days. Most systems cannot extract enough heat from the outside air to generate enough heat to overcome the heat loss inside the home. That only accounts for temp near or below 0°F, which may account for less than two weeks out of a year, in the upper midwest and great lakes region. They've gotten better, over the last decade or so, but they still recommend additional heat.

  37. ricardo kowalski

    ricardo kowalski

    6 dagen geleden

    Good stuff. If you can, do the clock alarm/radios and the WWVB stations. Cheers en.wikipedia.org/wiki/WWVB

  38. Kevin Yancey

    Kevin Yancey

    6 dagen geleden

    Electric heat is 99% efficient, as not all the electricity is used for heating. There are electronics and a blower, that also consume electricity. An oil filled electric radiator would be the closest to 100% efficient.

  39. Kevin Yancey

    Kevin Yancey

    6 dagen geleden

    I still have customers with standing pilots, vertical heat exchangers, and open flues, than are 70% efficient. Those with intermittent pilots are 78%. Add a damper to the flue, so the treated air doesn't go up the chimney in between heart cycles, and now you're up to 80%. Then came draft induced, horizontally fired heat exchangers, either with intermittent pilots, HSI, or spark ignition, still 80% efficient, but smaller physical size. And then came a secondary heat exchanger, that changes the direction the flue gases travel, from bottom fired to top fired, so that the cool air goes through the cooler flue gases first, then the primary last, extracting 90 plus percent of the heat, and allowing moisture to fall out of the gases, becoming a condensing furnace. From there, 2 state, multistage furnaces slowly increased efficiency, but in small increments, and mostly to the larger capacity ones. My 1994 90% Rheem 60K BTU single stage HSI furnace was rated at 93.3%, while the 90K BTU of the same was rated at 92.8%. Those same designs, today, are rated at 95.1%, and otherwise unchanged. If you must replace you furnace, and you live in the coldest regions, then buy a furnace rated at 95%. That means that 95 cents off every dollar in gas that goes into the furnace, becomes heat in your home. The rest goes outside the home, in exhaust through plastic pipes.

  40. captain young studios

    captain young studios

    6 dagen geleden

    hay do you do salt outs

  41. Steven Spencer

    Steven Spencer

    6 dagen geleden

    With all of the safety features of the furnace, why don't they include carbon monoxide detectors in the heat exchanger to ensure they aren't blowing the toxic gas into the living area? I.e. why is it left to the consumer to purchase a separate sensor?

  42. Outside the Target Demographic

    Outside the Target Demographic

    6 dagen geleden

    Inform us WHERE the Co2 alarms should be (high/low in a room). Most don't know.

  43. Sebastian Schneider

    Sebastian Schneider

    6 dagen geleden

    You could make a video on the history of auto-fokus. I think you'll find it interesting

  44. Sean A806

    Sean A806

    6 dagen geleden

    Interesting thing is electric heat was quite popular in Southern California in the 1950’s and 1960’s but everyone started switching over to natural gas heat since it’s way cheaper than electric here.

  45. Alex1911


    6 dagen geleden

    I have a gas water heater start dumping CO into the house. CO detector went off and I disabled it thinking it’s broken. Turned out next day when I mentioned it to someone they freaked out and called a repair co who found the plastic exhaust pipe cracked. Kinda freaky since it the time it just seems like an alarm malfunction when it’s for CO instead of smoke.

  46. Hein-Pieter van Braam-Stewart

    Hein-Pieter van Braam-Stewart

    6 dagen geleden

    Because of this video I finally purchased two CO monitors. So thanks Alec for talking about something that proooobably everyone should know about, but I didn't. For whatever reason.

  47. Chaz Madge

    Chaz Madge

    6 dagen geleden

    new gas condensing combi boilers will come with an efficiency rating of up to 98 per cent

  48. eye776


    7 dagen geleden

    Natural gas is only just taking off in **many** less developed countries, and the cost of this new infrastructure is likely to keep gas burning in place for decades to come.

  49. Uncle Duncan's Shack

    Uncle Duncan's Shack

    7 dagen geleden

    I wondered what this condensing furnace story was all about. Now I know, it's fitted with the additional heat exchanger to recover more energy. Furnaces with economizers of course heat the combustion air with what energy is left in the flue gasses and that makes for near complete energy recovery of the combustion process. What comes out the exhaust is cold. A furnace is a great bit of kit, a must have for cold climates. Thanks for the video.

  50. Tristan Andersen

    Tristan Andersen

    7 dagen geleden

    I am but one comment on this currently-most-recent video. But I’m using it to ask you to please cover the little “charging up” sound that old disposable cameras made on flash mode. I feel like it’s unintentionally become a subconscious inspiration for MANY “charging up” sounds for various “big machines” in media

  51. Evan G. Srinath Das

    Evan G. Srinath Das

    7 dagen geleden

    In your closed captioning video, you mentioned TELLE TEXT. I would like to learn more about that. Could you please bring forth a video addressing this?

  52. Samuel Creel

    Samuel Creel

    8 dagen geleden

    you know, I normally don't like sport/suit jackets with t shirts, but with you as I watch your videos, I cant imagine you wearing anything but that.

  53. rushthezeppelin


    8 dagen geleden

    One last thing, make sure your CO monitor is near the floor. Those combo alarms on a ceiling will only go off once CO levels at your head (or worse yet your pillow) is already quite high.

  54. rushthezeppelin


    8 dagen geleden

    12:40 this is why code mandates some kind of forced ventilation on all new homes.

  55. rushthezeppelin


    8 dagen geleden

    Is that a ML195UH070XP36B? I inspect new homes for energy efficiency so I see these things all day.

  56. ElMirc


    8 dagen geleden

    Are you sure the flame sensor is a thermocouple? I have no experience in home furnaces, so no idea about that, but marine boilers which have an electrode like that normaly work on a current sensor. Basicaly the burning flame is plasma, and it's conductive, so the electrode is placed directly in the flame and if it conducs a current betwen probe and nozzle, or another probe, it means flame is there. I've also seen with silicon diodes for IR and also photoelectric effect sensors for UV, but I guess that's a little more advanced. Also, very nice well structured video. Anybody can understand now how these little guys work.

  57. Zebrails


    8 dagen geleden

    I like your videos... not this one. Ignorant AND stupid people watch these videos. "Ignorant" people do not know. "Stupid" people do know but don't care for adverse consequences. That said, smart and knowledgeable people also watch these videos... but some of them are Facepalming as I am/have. "...gasses can be explosive..." Can be harmfull. This is why people do wrong things... "Literal" is not to be interchangable with "Figurative" ! 15:11 You said "Thermal Coupler... which is a Flame Sensor" without explaining what it is or ... that's Not a Thermal Coupler. NO! A Thermal Coupler IS NOT a Flame sensor. It is sensitive to Temperatures and has it's own purpose, NOT what you have explained. "This is easy to do..." Easy to say, and in this verbage is disgraceful. And you said "...it sees/looks for..." of which it cannot, "senses" is correct. You spoke of "BTU's" interchangably with "Kilowatts" without explaining power conversion. "Kilowatts" can be converted into "HorsePower" and vice-versa too... Another point to make is: If your metal exhaust pipe (80's furnace) is hotter, so too is wasted heat going the same direction "up". Please Correct these discrepancies when explaining furnaces that draw air from also inside the living areas from the "Intake Vents" which increases "that airflow" you speak of. Perhaps that was omitted. And mentioned Nothing about the Air Filter seen in the beginning of YOUR video. Why the Air Filter? Yeah, that's for drawing air FROM the living areas... All dust, and dander (skin cells [weigh your mattress when it's new, and five years later] ) plus pets such as cats, dogs, and other hairy/feathery animals... that air is sucked into those "Intake Vents,"and air conduits (HVAC) and drawn through those "Filters" before entering the flame area so it's "clean" and contains no other burnable particulates. "Please..." means that one does not have to, but it's common courtesy. "You Need" means take no alternative effort. Mentioning "North American furnaces..." is quite vague. North America, from the southern tip of Mexico to the northern tip of Canada contains 23 Countries. It's like saying that every house has or is void of a basement or attic. It's unfair/incorrect to make generalizations. Should I be sorry for what you're saying incorrectly? No. What is "Perfect"? Can be a matter of opinion, but this video has false facts. I "Would" say sorry because it has to do with "will" power. I "Could" say sorry because it has to do with "ability." I "May" say sorry because it has to do with "Choice" of care.

  58. Robert Noble

    Robert Noble

    8 dagen geleden

    Carbon monoxide detectors are reasonably cheap. Is there a reason they aren’t a part of the furnace?

  59. darkconsole


    8 dagen geleden

    in high winter winds the pilot would sometimes get blown out and relighting it was always my biggest fear, even more so than just the scary basement.

  60. Gabe R.

    Gabe R.

    8 dagen geleden

    is the video you referenced at 4:23 going to be about refrigeration? (yes, i have been waiting)

  61. Neville


    8 dagen geleden

    I much prefer the "old days" when nothing had an onboard computer and you could fix things with a screwdriver and pliers.

  62. tyler roberts

    tyler roberts

    8 dagen geleden

    "aich vee ahh see comapny" it's "aich vac"

  63. Oak_meadow


    9 dagen geleden

    I find it distressing that NLcameras deleted your channel from my favorites with out asking me first. That was wrong!

  64. shadowXXe


    9 dagen geleden

    I live in Scotland and usually (this is true for most of the UK too) we'll have a boiler and radiator system, and since our boiler is downstairs the exhaust pipe is located on the side of my house in the back garden this means that not only does it get a little steamy back there, but it also smells like used gunpowder, of course, that's only if the boiler is running full blast, the insulation is quite good so it only runs when the ambient air temp drops below a certain threshold



    9 dagen geleden

    LOL the Heat Nazi "NO HEAT FOR YOU!!!" Arrg! Heat Pump.. Sure, why just have an electric bill of a $100 or more in the summer, when you can enjoy one year round! YIPPIE!

  66. Kesek Ld

    Kesek Ld

    9 dagen geleden

    Looks like very dangerous device that depends too much on modern electronics.

  67. Adam Pena

    Adam Pena

    9 dagen geleden

    Quoting 1 point off the AFUE rating. This video is unwatchable.

  68. LTVoyager


    9 dagen geleden

    Having negative pressure to pull in cold outside air is not nearly as desirable as using an HRV or ERV.

  69. Elena Simon

    Elena Simon

    9 dagen geleden

    I enjoy your approach to technology. I am totally inept but you make it fun to learn. I’ll never use what you teach, probably, but maybe you can help an old lady. We have a Sony Bravo 60” TV we bought over 10 years ago. At 68 my hearing is not so good. I’ve never been able to get the earphone port to work. Can you suggest how I might be able to fix it OR some way make it possible to use Bluetooth ear buds? Thank you and keep up the videos.

  70. الكتريك ميكس

    الكتريك ميكس

    9 dagen geleden


  71. tauaru


    9 dagen geleden

    Are there differences of the fuel is oil vs natural gas?

  72. Cyber Corpse

    Cyber Corpse

    9 dagen geleden

    Why do you ignore me on Twitter? Do I not matter to you?

  73. Jared Falgout

    Jared Falgout

    9 dagen geleden

    My old furnace that was built in the 80s still has a gas pilot light that you have to light to fire the main burners. And it has a pretty interesting limit switch, it spins! It's basically a giant heat sensitive probe stuck in the exhaust chute, when the main burners are lit, the heat from them extends a big ol thermal bimetallic strip and causes it to extend to a certain point. When it extends all the way, it kills contact to the blower motor.

  74. ragana and broo

    ragana and broo

    9 dagen geleden

    My seven year old son and I LOVE your videos!!!!!!

  75. DeakBrenan


    9 dagen geleden

    Forced air heating is very rare in the UK. I understand it was popular in tower blocks in the 60's that had community heating but fell out of favour as the insulation was asbestos and they had to be sealed up. Most UK homes have natural (North Sea) gas based circulated hot water and convection based "radiators". New homes sadly are mostly electric heating because it is cheaper to install and a lot more expensive to run, "but that is the problem for another guy." All new gas boilers are condensing and the flue gas is cold and runs out inside the incoming air pipe so any breach is still enclosed.

  76. Arch Stanton

    Arch Stanton

    9 dagen geleden

    I've never seen so many bar / QR codes on a single object.

  77. GuruEvi


    10 dagen geleden

    Quick correction on your electric heating in areas with cold winters and large heat demands. In some areas, we actually do. In many areas, we actually may use electric heat as the wholesale cost of energy in the US produced by many nuclear plants in the North-East of the US and hydro from eg. Niagara Falls (invented by Nikola Tesla and funded by Westinghouse) is insanely cheap, cheaper than natural gas. Some communities there have communal or non-profit electric suppliers (yours truly included) where electric is 2-4c/kWh (or less for businesses and schools) whereas natural gas is ~6-8c/kWh. Our areas that do not have this service, for-profit electric supplies are in the same range of 6-8c/kWh. Therefore, many people now opt for electric as it is easier to install and costs about the same to run and allows you to cut your gas supplier completely (and associated monthly fees and taxes). Yes, I pay 2c/kWh, hence I will never use gas, even though my electric supplier promotes it to reduce the load on the net, which is a problem California is dealing with already. Yes, I do have a heat pump system as well, but those don't work a few degrees Kelvin below the freezing point of water.

  78. kenneth Jorgensen

    kenneth Jorgensen

    10 dagen geleden

    Your puns are....exhausting lol. jk, I come here specifically for the puns

  79. Tim M

    Tim M

    10 dagen geleden

    You are my new favorite...

  80. Dustin Buckingham

    Dustin Buckingham

    10 dagen geleden

    Forgot "roll out sensors" and would have been cool to show what really happens with a bad heat exchanger. The flame will be blown outside the furnace in extreme failures. Great video!

  81. TheMicro4


    10 dagen geleden

    Now I'm curious about the geothermal heating solutions. Not so sure it will work where I live but hey I'm still interested

  82. dacasman


    10 dagen geleden

    Hearing the draft inducer kick on while you're laying in bed on a cold winter night is one of the most comforting sounds in the world man.

  83. Swelch


    10 dagen geleden

    My furnace hasnt been working in a month and I was having trouble saving money for a tech to come out. After watching this something clicked when you were explaining how the furnace worked and I was able to go down and repair it. It was a problem with the pressure sensor. Thanks for saving me 500+ bucks!!!



      9 dagen geleden

      oh, RIGHT ON! :)

  84. Cowmanik


    10 dagen geleden

    Oh I thought this was like a furnace for an airplane. Thanks for clearing it up.

  85. Ace Strife

    Ace Strife

    10 dagen geleden

    I thought I was going to learn about my furnace, but instead I learned about furnaces in houses that aren't as ancient as mine. Might still be cheaper than using that mini-split we installed as a heater though, because god the price for electricity is insane. ..plus it smells toxic on heating mode.

  86. Douggernaut84


    10 dagen geleden

    Woo hot water baseboard crew represent!

  87. Jose Junior

    Jose Junior

    11 dagen geleden

    All this or for the heaters for the future are already on the past. To heat your house you just need a gamer pc with AMD GPU

  88. robert hamilton

    robert hamilton

    11 dagen geleden

    Those tiny sparky things used to break a lot and we're expensive. So my guess is you need A-C for the fan so might as well put a resistance there instead.

  89. kris754a


    11 dagen geleden


  90. Amy Dentata

    Amy Dentata

    11 dagen geleden

    Carbon monoxide detectors are still a good idea even if you don't have fuel-burning heat. Where I live, we inherited faulty wiring which broke the electrical heaters, which in turn produced heaps of surprise carbon monoxide, which in turn nearly killed me! But then the alarm went off, waking me up and alerting me to the problem. Fun times.

  91. D.S Tice

    D.S Tice

    11 dagen geleden

    You should do a video on near-infrared goggles and how our eyes are sensitive to the near infrared range, it's just drowned out by visible light. The goggles can be made to block visible light and thus turn your vision into a trippy acidscape of super vibrant blues, reds, purples, and how some colours in the visible light range completely change colour when seen in near IR (ex. Green foliage turns into such a vibrant, beautiful red colour, and the texture of leafs looks like velvet, also the sky turns a purple/blue) Super cool and very unique project.

  92. Hilltop Gaming

    Hilltop Gaming

    11 dagen geleden

    ~~efficiently smooth jazz~~

  93. anticat900


    11 dagen geleden

    I didn't know American furnaces were actually different to boilers, I thought they were just naming differences. Warm air heaters I've seen in operation in caravans and a ideal home exhibition in the 80's, they seem to work ok. What is the advantage / disadvantage of warm air to water radiators?

  94. it's 6884

    it's 6884

    11 dagen geleden

    this time I can't stop looking at your hair

  95. over00lord Unknown

    over00lord Unknown

    11 dagen geleden

    This video isn’t like candy for your channel! All the separate components working together to ensure safe and constant operation really works perfectly for the purpose of this channel (how technology connects together).

  96. Luis Serrano

    Luis Serrano

    11 dagen geleden

    I have a lot of friends who smoke carbon monoxide. Can't see how it's so dangerous.

  97. yoksel99


    11 dagen geleden

    Still not explained where the condensing going on in condensing furnaces, and where the acidic condensate is coming from and why is it acidic.

  98. Bob Koss

    Bob Koss

    11 dagen geleden

    A diagram showing how it works might have been useful in addition to pictures of the actual hardware.

  99. AJ


    11 dagen geleden

    You have to correct yourself a lot. So when will you stop waving your dictorial hand on legislation issues?

  100. Mr.O


    11 dagen geleden

    Looking forward to more heating videos. :). Hint hint your own clock is running. Thanks :)