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The stolen heat! (infosec.pub)

submitted 4 weeks ago by NichEherVielleicht@feddit.org to c/comicstrips@lemmy.world

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[–] Krelis_@sh.itjust.works 2 points 3 weeks ago* (last edited 3 weeks ago) (1 children)

The 3.5 kW heater will have a tank reservoir that will have time to heat up the water when it's not being used. Tankless means it has to be heated instantly.

It takes ~ 4 kJ to heat 1 kg of water for each 1°C. If you want to do that in 1 second, you need 4 kW of heating power.

So if a shower uses, say, 9 litres per minute, i.e. 0.15 litres per second, heating that water from 10°C (typical cold water temperature) to 40°C (comfortable shower temperature) is:

4 • 0.15 • 30 = 18 kW

Anything less heats less water per second, or to a lower temperature.

Like this 5.1 l/min unit at 9.5 kW will be able to heat that flowrate ~28°C above its inlet temperature.

[–] meekah@discuss.tchncs.de 2 points 3 weeks ago (1 children)

Oops, my bad, I really thought it used a regular 240v plug. Turns out its hooked into my kitchen's high voltage (400v) circuit and uses 21kW.

Thanks for explaining why physically my assumption could not be possible.

[–] thetrekkersparky@startrek.website 1 points 3 weeks ago

400V in residential sounds exciting. That's one way to cut down on wire cost I guess.