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Great! i always wanted one. You should add an action pic of you using it!
I like the creativity!Only risk with your design is that the hot water or one of you moving around in there could damage the water pump or wire, then 220v/110v shocks all of you. Maybe to death. This is why aquarium or pond pumps put in their instructions that you must unplug the pump before touching the water.What I did for a new years party is I used an inflatable pool, a 12v "camping shower" pump that was powered by a car battery and a gas powered camping water heater. worked well!