The Tub. I chose a Rubbermaid 100-gallon stock tank for a few reasons.. First, it’s deeper than the metal tanks I saw. Second, the plastic itself is a more comfortable temperature in hot or cold ...

[HowToLou] got back to basics instead, with his simple wood-fired water heater design. The design is straightforward, featuring 100ft of quarter-inch copper tubing wrapped directly around a steel ...

Some wood burning sauna heaters have extra water tanks. These can also be purchased separately and plumbed into the heater. These mean the sauna heater can also be used to heat large amounts of water.

Chofu offers gas and wood-fired heaters. Both types of stoves use convection to move the water, so no pumps are required, and they both can heat 100 gallons of water in about an hour and a half.

Wood Burning Heaters: Price Range. It is possible to buy a relatively cheap furnace or boiler for less than $2,000 but, remember, you get what you pay for.