Submersible vs. external hot tub stove

June 18, 2021

A common brand of external heater is the Chofu, and other examples of home made heaters are common. External wood burners usually rely on a principle called “thermal siphoning”. Thermal siphoning is achieved by having the stove lower than the tub. Hot water rises, creating the circulation of the hot water.

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Why wood as a fuel?

June 18, 2021

Wood is essentially stored up solar energy. Trees use solar energy, CO2, water and soil minerals to produce wood. This stored up solar energy can be released through burning. Wood burning does not release more CO2 than when it rots so can therefore be called carbon neutral.

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