Energy Guide Labels, What's up with those? скачать в хорошем качестве

Energy Guide Labels, What's up with those?

Let's find out how water heater Energy Guide data is calculated and see how my data compares to the labels. In a previous video, I discussed natural gas consumption data for my old 40 gal. tank and new tankless water heater. I figured it would be interesting to compare the actual to predicted consumption data and see if any conclusions can be drawn from that. Conclusions: 1. EnergyGuide data is only useful for comparing similar devices; one tank vs. another tank. Its useless for comparing a tank to a tankless heater (see details below) 2. The more deviations you have from the DOE test conditions the less the EnergyGuide data will be applicable. Probably best to plug your own usage information into the on-line calculator if you want to get better data. 3. The high hot water consumption and high temperature rise/set point over emphasize the burner efficiency and diminish the standby losses. If you use significantly less hot water, the standby losses will dominate your cost, but that won't be apparent in the label data. Using my own gas consumption with a 40 gal. tank and the tankless heater, Energy Guide was about $200 or 175 therms/yr. on the tank and $176 or 154 therms/yr. on the tankless. That says my gas bill/consumption should be about 15% less with the tankless. Real world data: Tank: 54 therms/yr. Tankless: 9 therms/yr. That's an 83% reduction over the tank and 6% of the rated gas consumption, full details in the video below:    • Tankless Water Heater - 12 Month Update - ...   I'm using the same amount of hot water, running similar dish washer/clothes washer cycles, same number of showers, etc. So this savings is mainly from eliminating standing losses by not having a huge tank of hot water losing heat 24/7. As a point of reference, in the winter months, when the outside sprinkler system is off, my house averages about 45 gal (170L)/day for water consumption (it's between 1 and 2 HCF). The Energy Guide hot water consumption number is 64 gal (242L)/day! Even if I ran all the house water through the heater, I would still come up short on that total. It's difficult to determine how much hot water your house will use. Most US water meters read in HCF (hundred cubic feet) about 754 gallons. Using 64 gal/day equates to about 2.6 HCF of water/month: https://www.unitsconverters.com/en/Ga... If you assume 50:50 hot:cold ratio, you're baseline water use would need to exceed 5 HCF/mo. and at a 2:1 ratio, more like 8 HCF and this without any outdoor landscape watering. Unless your hot water consumption is around this 64 gal/day range, it's not possible to use Energy Guide ratings to compare the operating cost of say a tank vs. a tankless heater. Why? At 64 gal/day, the bulk of the energy is going into heating all that water and only a small amount of standby losses. But if you use 1/5 the amount of water, then the bulk of the energy is going into standby losses on a tank and that's zero on a tankless. Also note, that a common suggestion of putting an electric tank heater on a timer to reduce energy consumption will not have much affect. Why? Again, standby losses. A tank full of hot water will lose heat to the surroundings. Sure, as that tank cools from say 120F to 110F - 100F, the rate of heat loss will drop somewhat, but when you turn the power back on, all that lost heat still has to be made up by the heating element. So instead of cycling on a few minutes each hour around the clock, it may instead need to be on for an hour or two straight to reheat the entire tank: https://inspectapedia.com/plumbing/Ho... FTC Energy Guide info: https://www.consumer.ftc.gov/articles... Energy Guide - US: https://en.wikipedia.org/wiki/EnergyG... Energy Star: https://en.wikipedia.org/wiki/Energy_... EnerGuide - Canada: https://en.wikipedia.org/wiki/EnerGuide Energy Rating Label - Aus/NZ: https://en.wikipedia.org/wiki/Energy_... Energy Label - EU: https://en.wikipedia.org/wiki/Europea... Water heater energy calculator. https://www.energy.gov/eere/femp/ener... DOE web page: https://www.energy.gov/energysaver/es... Mr. Electricity water heater information page: http://michaelbluejay.com/electricity... Energy Guide label information from the Home Depot web site: https://www.homedepot.com/b/Search/N-... Some details on the 64 gal/day hot water consumption figure: https://www.usgbc.org/articles/optimi... Subscribe for more content like this Feel free to rate, comment and share And as always, thanks for watching Intro: Louisiana Fairytale by Austin Rogers https://web.archive.org/web/201704022...