Quick Answer
A gravity-fed hot water supply can be created by installing a thermosiphon system, which uses the principle of convection to circulate hot water from a wood-fired water heater or stove coils to a storage tank, providing a continuous flow of hot water.
Choosing the Right Components
To create a gravity-fed hot water supply, you’ll need a reliable source of heat, such as a wood-fired water heater or stove coils. The water heater should be capable of producing temperatures between 150°F to 200°F (65°C to 90°C) to ensure efficient thermosiphoning. A tank with a minimum capacity of 30 gallons (114 liters) is recommended for a small household. A pressure relief valve and temperature and pressure relief valve are essential safety features to consider.
Installing the Thermosiphon System
The thermosiphon system should be installed at an elevation higher than the storage tank to facilitate gravity-fed flow. The system consists of a hot water supply line, a return line, and a vent pipe. The hot water supply line should be insulated to prevent heat loss. The return line should be sized to match the flow rate of the hot water supply line. A vent pipe is necessary to allow air to escape and prevent vacuum formation.
Tips and Considerations
A batch heater can be used as an alternative to a thermosiphon system, but it requires more manual intervention and is less efficient. Consider using a stainless steel or food-grade plastic tank to prevent contamination of the hot water. Regular maintenance and inspections are crucial to ensure the system operates safely and efficiently. A well-designed and installed thermosiphon system can provide a reliable and cost-effective hot water supply for years to come.
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