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Apparently tankless water heaters draw something crazy like thirty kilowatts, which is more than the rest of your appliances combined and probably requires a la
by erik_seaberg 7y ago
Apparently tankless water heaters draw something crazy like thirty kilowatts, which is more than the rest of your appliances combined and probably requires a landlord to agree to rewiring. Maybe if you have a natural gas supply it's more practical.
This is also why it's rare to fast charge an EV at home—that can top fifty kilowatts.
- magicalhippo 7y agoIf you need 10 liters/min of hot water, got an intake temperature of 10C and want to heat it to 40C (hot shower, my gf loves them), it takes about 21kW[1]. If you use a water-saving shower head that only uses 5 liters/min that cuts in half, but still quite a lot of peak energy. Now you might argue that you only use it for a wee bit while you shower. And that is true. However here in Norway they will soon introduce a peak demand pricing element on the electricity bill, which means you'd likely end up paying a lot for that instant heating. In contrast, showers are typically taken in the morning, so the water heater tank could get nice and hot during the night when electricity prices are low, and then kept off during the day. [1]: https://bloglocation.com/art/water-heating-calculator-for-time-energy-power https://bloglocation.com/art/water-heating-calculator-for-ti... (Water Heating Power Calculator)
- kevstev 7y agoNatural gas tankless exists: https://www.homedepot.com/b/Plumbing-Water-Heaters-Tankless-Water-Heaters-Tankless-Gas-Water-Heaters/N-5yc1vZc1u0 https://www.homedepot.com/b/Plumbing-Water-Heaters-Tankless-... I have this in my house.