The main greenhouse had a gas fired water heating system that had been condemned. So after much toing and froing and the application of a reciprocating saw it has been pulled out.
Gas is something we just can’t afford to use at this time and we can’t generate enough of our own on site (more details to come) so we hit open the idea of using a rocket stove based water heater.
For those that have never heard of them, rocket stoves are essentially hyper efficient and well insulated burn chambers that convert the fuel into useable heat leaving nothing but ash. The whole process is called pyrolysis and occurs in a j shaped tube that allows air to mix freely with the site of combustion. We will be building a kitchen version into the outdoor cooking space.
Originally we were going to use the output to heat water but after reviewing the pluming arrangements we have decided to go with a rocket mass heater system. In this type of design the output heat is run through a large thermal mass which absorbs the heat and releases it back slowly.
Should be an interesting little project.