In this place we have a large amount of biomass resulting from the forest cleaning, the pruning of the olive trees, etc. For this reason we think of using it as a source of energy to create a circuit of hot water or to heat the house. Thus, we developed a water heating system based on a rocket stove and a thermo-accumulator obsolete that we recovered.

The system is based on a main water circuit that feeds the 50 liter thermo-accumulator and serves water for a home network and a washing machine. The main circuit water comes from the same source as the rest of the piped water that we use on the farm, which is pumped by a SHURflo pump of only 80 watts into a tank that is located in a higher area. From such a tank, the water enters the thermo accumulator with some pressure by setting the pressure level of the system.

We modified the thermo-accumulator so that it had one inlet and one exit more and thus, with the same water, to simplify without heat exchanger, establish a secondary circuit that connects the thermo-accumulator to the rocket stove.


The rocket stove is handcrafted from a can of dog food. Inside it has a clay chamber and expanded clay inside which, we installed a 12mm copper pipe coil where the water of the secondary circuit passes to warm up. Then it goes through convection to the thermo-accumulator where it mixes with the existing water by heating it too. The thermo-accumulator is then used to keep the water warm.



The rocket stove also allows us to cook as soon as it is on and could even be installed a secondary radiator to warm the environment. This system will be extended by placing a solar collector that, in sunny days, allows to heat the water instead of using biomass. Feeding the washing machine with hot water is also an important point. The washing machine was recovered from the clean point and we unplugged the electrical resistance that heats the water, which spends an enormous amount of energy incompatible with who produces its own electricity like us.

With all this multi-functionality and cycle closure, this system is fully integrated into the principles of permaculture.