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I don't follow. My hot water is heated up about 60cm before the tap, as it runs through. Is that a regional thing? Are you saying that you're keeping a large qu
by kleiba 3y ago
I don't follow. My hot water is heated up about 60cm before the tap, as it runs through. Is that a regional thing? Are you saying that you're keeping a large quantity of water at temperature at all times just in case someone might need it later? Wouldn't that be super inefficient energy-wise?
- I_Am_Nous 3y agoThis is the standard North American approach, we have large insulated tanks that hold water at generally 38-48 degrees Celsius. My home uses a 40 gallon "water heater" using natural gas with an always burning pilot light. It's possible to "run out of hot water" as a result.
- argiopetech 3y agoThe common statistics I've heard is 30% of household energy usage goes to keeping the hot water heater at temp. How much of your power usage is water heating?
- woobar 3y agoLooked at my natural gas usage. In the summer it only used for water heating/keeping it hot at 10 therms/month. Total annual gas usage is 700+ therms. 12*10/700 = 17%. And this includes both heating and keeping it hot. This site [1] quotes 0.0113 therms to heat a gallon of water. 120 therms / 0.0113 / 365 = 29 gals of hot water per day. This place [2] estimates 41 gallons of hot water per day used during peak demand. My estimate is that we use more for showers, less for washers/dishwashers, same for faucets. Looks like I would spend all of my BTUs on heating these 29 gals of water every day. Most likely close to single digits %% for keeping it hot. [1]https://webbsupplycompany.com/scalesafe/what-does-it-cost-to-heat-your-water/ https://webbsupplycompany.com/scalesafe/what-does-it-cost-to... [2]https://michaelandson.com/blog/what-size-water-heater-do-i-need#:~:text=Using%20our%20list%20of%20appliances,Kitchen%20faucet%20%3D%204%20gallons https://michaelandson.com/blog/what-size-water-heater-do-i-n...