Jason and Angie Bechtel Bringing Hope to Unreached People Groups 
In jungle camp, most of the wood-fired oven/stoves also have a 5 gallon pail built into the side of the fire box to hold and heat water by convection. This year, myself and two other classmates built new stoves, and changed the plans in a number of ways, one being the hot water system.
Instead of a 5 gallon mail sitting next to the firebox, we installed a hot water coil and adjacent water barrel. I placed my water barrel a couple of feet above my stove. The barrel had two 1/2 inch pipe fittings that I installed; one near the bottom and one near the top. Once the water barrel was filled, the cooler water would leave the bottom of the barrel and flow through a hose into the aluminum water coil in the stove, entering in the bottom of the stove. As the fire heated the water in the coil, it would rise and return to the water barrel above. The water temperature different (resulting in a difference in density) would force the water to circulate without the need of a water pump. The cold water falls and the hot water rises, circulating through the heating coil and water barrel, heating the water barrel in the process.
From the barrel I had the hot water plumbed over to the kitchen sink and the shower (along with cold water too).
