Quick Answer
For a tiny house, a 10-20 gallon wood-fired water heater is a suitable size, allowing for efficient heating with moderate energy input.
Choosing the Right Size
When selecting a wood-fired water heater for a tiny house, it’s essential to consider the space available and the energy requirements. A 10-20 gallon (38-76 liter) tank is a good starting point, as it provides ample hot water for a small household. This size also allows for more efficient heat transfer, as the water is heated more quickly.
Thermosiphon vs Batch Heaters
Thermosiphon systems, which rely on the natural circulation of water and heat, are a popular choice for wood-fired water heaters. These systems typically use a larger tank, around 20-30 gallons (76-114 liters), and are more suitable for larger households. Batch heaters, on the other hand, use a smaller tank and heat water in batches, making them more suitable for tiny houses. Batch heaters often use stove coils or a heat exchanger to transfer heat from the stove to the water.
DIY Hot Water Options
For a DIY approach, consider using a 10-20 gallon (38-76 liter) tank and a stove coil or heat exchanger to heat the water. This setup can be more cost-effective and customizable to your specific needs. When designing your system, ensure proper insulation, a well-sealed tank, and efficient heat transfer to minimize energy loss and maximize hot water production.
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