this post was submitted on 21 Nov 2025
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[–] lime@feddit.nu 8 points 4 days ago (2 children)

doing the math, tankless heaters use insane amounts of electricity. we were gonna use one for a detached guest house so we could skip the insulated pipe, but holy shit the cabling we'd have to install

[–] DerisionConsulting@lemmy.ca 4 points 4 days ago (2 children)

Depending where you live, the tankless heater might run on gas.

Which is sometimes better for the environment than the electricity, if the grid is coal powered.

[–] LemmyKnowsBest@lemmy.world 4 points 4 days ago

I have a tankless water heater and a designated propane tank for it.

[–] lime@feddit.nu 1 points 4 days ago* (last edited 4 days ago) (1 children)

i don't think those are approved for installation in buildings here. and i wouldn't want gas in my house anyway.

[–] DerisionConsulting@lemmy.ca 1 points 4 days ago (1 children)

I agree that natural gas in homes sucks, I'm glad that Sweden has mostly phased it out.

[–] lime@feddit.nu 1 points 4 days ago

yeah only place i know that still has gas ranges is turn-of-century buildings in stockholm. one almost set fire to my aunt.

[–] HugeNerd@lemmy.ca 2 points 4 days ago (1 children)

Heating the same amount of water to the same temperature requires the same amount of energy.

[–] lime@feddit.nu 1 points 4 days ago (1 children)

yes, but not the same amount of electricity. without a tank there's no heat storage to take energy from.

[–] HugeNerd@lemmy.ca -1 points 4 days ago (1 children)

And this energy, it came from... you rubbing your hands together? The tank will take more as the hot water sitting there is constantly cooling. It will take a system that can supply more instantaneous current, sure, like my humble cardboard shack doesn't have the electrical to really work well with a tankless heater.

[–] lime@feddit.nu 1 points 4 days ago (1 children)

you should probably read up on water heaters.

[–] HugeNerd@lemmy.ca 1 points 3 days ago

Oh pray tell, what should I read oh Richard Feynman of water heaters?