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#1
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Humidifier - Hot vs Cold Water Experiment
replying to Peter, Mike K wrote:
Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm |
#2
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Humidifier - Hot vs Cold Water Experiment
On Thursday, February 21, 2019 at 1:14:12 PM UTC-5, Mike K wrote:
replying to Peter, Mike K wrote: Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm If you have a gas water heater set to 130F, the chances of legionaires being a problem is extremely remote. The bacteria can't multiply at that temperature and at slightly higher temps are dead within hours. I've seen quite a few stories in the news of people catching legionaires disease, but it's never been from a residential water heater. NYC had a bunch of cases last few years, all from AC cooling towers on roofs that sent droplets of warm water into the air. I'd be perfectly fine living with 120F, but 130 is better for clean dishes. |
#3
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Humidifier - Hot vs Cold Water Experiment
On 2/21/2019 6:36 PM, trader_4 wrote:
On Thursday, February 21, 2019 at 1:14:12 PM UTC-5, Mike K wrote: replying to Peter, Mike K wrote: Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm If you have a gas water heater set to 130F, the chances of legionaires being a problem is extremely remote. The bacteria can't multiply at that temperature and at slightly higher temps are dead within hours. I've seen quite a few stories in the news of people catching legionaires disease, but it's never been from a residential water heater. NYC had a bunch of cases last few years, all from AC cooling towers on roofs that sent droplets of warm water into the air. I'd be perfectly fine living with 120F, but 130 is better for clean dishes. 130F is both an energy waster and a scalding hazard. Depending upon the efficiency and insulation of a hot water heating and distribution system, you might even end up spending more $ on energy costs heating your hot water source to 130F than you save in electricity by running the humidifier less due to greater evaporation by using a hot water source for that humidifier. Most modern dishwashers have some sort of pre-heat or temperature boost feature that compensates for a supply temperature that's lower than 130F. That way, you only spend energy to heat the dishwashing machine water, not all your other hot water which needs to be cooled with cold water for safe hand dish washing and bathing (to avoid scalding). |
#4
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Humidifier - Hot vs Cold Water Experiment
On 2/22/2019 8:57 AM, trader_4 wrote:
On Friday, February 22, 2019 at 7:47:45 AM UTC-5, Peter wrote: On 2/21/2019 6:36 PM, trader_4 wrote: On Thursday, February 21, 2019 at 1:14:12 PM UTC-5, Mike K wrote: replying to Peter, Mike K wrote: Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm If you have a gas water heater set to 130F, the chances of legionaires being a problem is extremely remote. The bacteria can't multiply at that temperature and at slightly higher temps are dead within hours. I've seen quite a few stories in the news of people catching legionaires disease, but it's never been from a residential water heater. NYC had a bunch of cases last few years, all from AC cooling towers on roofs that sent droplets of warm water into the air. I'd be perfectly fine living with 120F, but 130 is better for clean dishes. 130F is both an energy waster and a scalding hazard. Depending upon the efficiency and insulation of a hot water heating and distribution system, you might even end up spending more $ on energy costs heating your hot water source to 130F than you save in electricity by running the humidifier less due to greater evaporation by using a hot water source for that humidifier. Most modern dishwashers have some sort of pre-heat or temperature boost feature that compensates for a supply temperature that's lower than 130F. That way, you only spend energy to heat the dishwashing machine water, not all your other hot water which needs to be cooled with cold water for safe hand dish washing and bathing (to avoid scalding). I'm sure you'll be hearing from the folks that will tell you that lower than 130F will kill you from Legionnaires. The Legionnaire's risk is not limited to when it's used for a humidifier. I suppose if 130F is so dangerous, they should stop selling water heaters that can be set to not only that, but a lot higher. Put a low limit on it like they did with hot tubs, now people come here complaining they can't get a hot tub/spa hot like they enjoy it. Like I said, I'm happy with 120F myself. Pick your risk. And I never suggested anything about needing to set the water heater to any particular temperature for use to feed a humidifier. 120, 130F are all way above 40F incoming cold water, if you need to maximize evaporation, 120F is above the temperature that Legionnaires bacteria can multiply. Since you're worried about Legionnaires from water heaters, perhaps you can show us all the cases where that's actually happened, where people contracted it, from residential water heaters? I've yet to hear of an actual case and there are how many hundreds of millions of water heaters out there? That's the second time you've distorted what I've written. I never said that you can get Legionnaire's from a water heater's water. What I said was that a hot water supply to a humidifier increases the risk of Legionnaires from the humidifier. The bacteria most likely enter the humidifier from the air (carried with dust, mold spores, etc.). The risk is from the temperature of the water on the humidifier's evaporative medium, which is much more conducive to the growth of bacteria when the humidifier is supplied with hot water than when it is supplied with cold water. It is highly unlikely that the temperature of the water on the surface of the evaporative medium is out of the range of about 68F-113F (the growing temperature of the bacterium that causes Legionnaire's) by the time hot water travels through the uninsulated thin copper pipe that supplies most furnace humidifiers and has been blown by the humidifier's fan. I never said that the bacteria grow in typical hot water heaters. I'm on your side; I set my hot water water heater to 120 as well. |
#5
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Humidifier - Hot vs Cold Water Experiment
On Friday, February 22, 2019 at 10:37:12 AM UTC-5, Retirednoguilt wrote:
On 2/22/2019 8:57 AM, trader_4 wrote: On Friday, February 22, 2019 at 7:47:45 AM UTC-5, Peter wrote: On 2/21/2019 6:36 PM, trader_4 wrote: On Thursday, February 21, 2019 at 1:14:12 PM UTC-5, Mike K wrote: replying to Peter, Mike K wrote: Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm If you have a gas water heater set to 130F, the chances of legionaires being a problem is extremely remote. The bacteria can't multiply at that temperature and at slightly higher temps are dead within hours. I've seen quite a few stories in the news of people catching legionaires disease, but it's never been from a residential water heater. NYC had a bunch of cases last few years, all from AC cooling towers on roofs that sent droplets of warm water into the air. I'd be perfectly fine living with 120F, but 130 is better for clean dishes. 130F is both an energy waster and a scalding hazard. Depending upon the efficiency and insulation of a hot water heating and distribution system, you might even end up spending more $ on energy costs heating your hot water source to 130F than you save in electricity by running the humidifier less due to greater evaporation by using a hot water source for that humidifier. Most modern dishwashers have some sort of pre-heat or temperature boost feature that compensates for a supply temperature that's lower than 130F. That way, you only spend energy to heat the dishwashing machine water, not all your other hot water which needs to be cooled with cold water for safe hand dish washing and bathing (to avoid scalding). I'm sure you'll be hearing from the folks that will tell you that lower than 130F will kill you from Legionnaires. The Legionnaire's risk is not limited to when it's used for a humidifier. I suppose if 130F is so dangerous, they should stop selling water heaters that can be set to not only that, but a lot higher. Put a low limit on it like they did with hot tubs, now people come here complaining they can't get a hot tub/spa hot like they enjoy it. Like I said, I'm happy with 120F myself. Pick your risk. And I never suggested anything about needing to set the water heater to any particular temperature for use to feed a humidifier. 120, 130F are all way above 40F incoming cold water, if you need to maximize evaporation, 120F is above the temperature that Legionnaires bacteria can multiply. Since you're worried about Legionnaires from water heaters, perhaps you can show us all the cases where that's actually happened, where people contracted it, from residential water heaters? I've yet to hear of an actual case and there are how many hundreds of millions of water heaters out there? That's the second time you've distorted what I've written. I haven't distorted anything. I never said that you can get Legionnaire's from a water heater's water. What I said was that a hot water supply to a humidifier increases the risk of Legionnaires from the humidifier. The bacteria most likely enter the humidifier from the air (carried with dust, mold spores, etc.). The risk is from the temperature of the water on the humidifier's evaporative medium, which is much more conducive to the growth of bacteria when the humidifier is supplied with hot water than when it is supplied with cold water. A totally unproven anf false assertion. If anything, hot water at 130F could reduce the chances of Legionnaires, by raising the temperature on the upper parts of the media. This is a total nit. The media is exposed to hot air at an ideal temperature to grow legionnaires whether using hot or cold. The water exiting the humidifier is essentially the same whether using hot water or cold water. The media quickly drains and dries out in the typical modern design, Legionnaire's can't grow on a dry media that quickly cools to room temperature or lower. If you're using some old crap humidifier that has standing water in it, which no one uses because it can grow all kinds of bacteris, that tepid water will be at the ideal temperature to grow legionnaires, regardless of whether it's fed with hot or cold water. But if it were fed with 130F water, it would tend to kill Legionnaires, not promote it. It is highly unlikely that the temperature of the water on the surface of the evaporative medium is out of the range of about 68F-113F (the growing temperature of the bacterium that causes Legionnaire's) by the time hot water travels through the uninsulated thin copper pipe that supplies most furnace humidifiers and has been blown by the humidifier's fan. Per the above and the results of my actual experiment, the temperature of the water rapidly declines as it travels from the top of the media, to the bottom. The exit temp is about the same whether using hot water or cold water. It's all a nit, because the water is only there briefly and then the media dries out. There is ZERO evidence this has ever been an issue with Legionnaires disese. I never said that the bacteria grow in typical hot water heaters. I'm on your side; I set my hot water water heater to 120 as well. I have mine at 130F. |
#6
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Humidifier - Hot vs Cold Water Experiment
On 2/21/19 6:36 PM, trader_4 wrote:
I'd be perfectly fine living with 120F, but 130 is better for clean dishes. Yup, when the environmental pond-huggers took the phosphates out of dishwasher detergent I had to crank the water heater temp up to 145F |
#7
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Humidifier - Hot vs Cold Water Experiment
"Peter" wrote in message ... On 2/21/2019 6:36 PM, trader_4 wrote: On Thursday, February 21, 2019 at 1:14:12 PM UTC-5, Mike K wrote: replying to Peter, Mike K wrote: Good point unless you are using a tankless hot water system (like me -- for full context, visit https://www.homeownershub.com/mainte...nt-358875-.htm If you have a gas water heater set to 130F, the chances of legionaires being a problem is extremely remote. The bacteria can't multiply at that temperature and at slightly higher temps are dead within hours. I've seen quite a few stories in the news of people catching legionaires disease, but it's never been from a residential water heater. NYC had a bunch of cases last few years, all from AC cooling towers on roofs that sent droplets of warm water into the air. I'd be perfectly fine living with 120F, but 130 is better for clean dishes. 130F is both an energy waster and a scalding hazard. Depending upon the efficiency and insulation of a hot water heating and distribution system, you might even end up spending more $ on energy costs heating your hot water source to 130F than you save in electricity by running the humidifier less due to greater evaporation by using a hot water source for that humidifier. Most modern dishwashers have some sort of pre-heat or temperature boost feature that compensates for a supply temperature that's lower than 130F. Most of ours only have a cold water feed, washing machines too. But then we have a 240V system so it doesn’t take long to heat the minimal amount of water in a dishwasher from cold even in winter. That way, you only spend energy to heat the dishwashing machine water, not all your other hot water which needs to be cooled with cold water for safe hand dish washing and bathing (to avoid scalding). But doing it that way uses less of the hot water. |
#8
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Lonely Psychotic Senile Ozzie Troll Alert! LOL
On Sat, 23 Feb 2019 06:12:49 +1100, cantankerous trolling senile geezer Rot
Speed blabbered, again: Most of ours only have a cold water feed, washing machines too. Nobody here is talking about Australia, senile Ozzietard! -- Bod addressing abnormal senile quarreller Rot: "Do you practice arguing with yourself in an empty room?" MID: |
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