People who own hot tubs love to complain about how much it costs to heat their hot tub, as if the discussion about cost is an integral part of the hot tub experience.
But what if you could heat up your hot tub without spending a dime on electricity?
Lauri Vuohensilta and Anni Vuohensilta of the Beyond the Press channel think they've found a way to do just that, only their method for heating hot tubs seems a bit dangerous- since it involves using a 50-lb. cylinder of red hot steel.
-Via Laughing Squid
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Looks like electricity is involved. And propane.
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But it is fun to calculate! 5 cubic meters (5000 kg) of water at 20C, 20kg of steel at 1,400C. The specific heat of water is about 8x that of steel. (5000*8*20+20*1400)/(5000*8+20) = 20.7C, if it were evenly mixed. Also, that's a wood-powered hot tub, so they already aren't spending a dime (or a Euro) on electricity.
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