Quick Answer
Yes, you can make your own batch heater from scratch, using a combination of materials like steel, insulation, and a wood stove or rocket mass heater.
Designing the Heater
To make a batch heater from scratch, start by designing the basic structure. Use a steel drum or a custom-built tank as the vessel, and add insulation around it to minimize heat loss. A 55-gallon steel drum is a good starting point, and you can add insulation like foam board or refractory insulation to keep the heat in.
Building the Heater Core
The core of the batch heater is where the magic happens. You’ll need to create a heat exchanger to transfer heat from the wood stove or rocket mass heater to the water. Use a steel plate or a heat exchanger coil to create the core. A 1/4 inch thick steel plate is a good choice, and you can attach it to the side of the drum using bolts or welding.
Connecting the Wood Stove or Rocket Mass Heater
Once you’ve built the heater core, it’s time to connect the wood stove or rocket mass heater. Use a flue or a chimney to connect the stove to the heater core, making sure to include a heat transfer pipe to carry the heat from the stove to the core. A 6-inch diameter flue is a good choice, and you can use a insulated pipe to carry the heat to the heater core.
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