You know how you can take a little paper Dixie cup, fill it full of water, and set that sucker right over a campfire — and the water'll boil but the paper won't even catch fire?
Well, that's 'cause the water's doin' all the work. It's soakin' up all that heat like a sponge.
Now, you might be a redneck if you hear that and go, "Well hell, why can't we just do that BIGGER?"
And you'd be right!
It's all just entropy, y'all. That's a fancy word for "heat's gotta go somewhere."
You just gotta figure out how much water you need to soak up all that fire-heat and spread it around, so the water stays nice and bath-tub warm for us regular folks instead of boilin' your butt off.
Same trick as the paper cup. Just... a whole lot more water, and a whole lot bigger fire.
If your hot tub is heated by a campfire and your thermostat is a garden hose, you might be a redneck.
Just like you can boil water over a fire, in a paper cup, without the paper burning. You can scale it up. It’s all entropy. You just need to figure out how much water will absorb and dissipate the heat, enough to keep the water at a comfortable temperature for humans.