Is it possible to run a water heater off a wood cookstove?

Wood Stove Water Heater Basics

To use a wood stove as a water heater, you’ll need a specialized water heater, also known as a “hydronic” or “thermal mass” water heater. These units are designed to absorb and store heat from the wood stove, which is then transferred to a separate water tank for bathing and cleaning. Look for a unit with a minimum storage capacity of 50 gallons and a heat exchanger rated for at least 30,000 BTUs.

Installation Considerations

Proper installation of a wood stove water heater requires careful planning and execution. The water heater should be placed within 6 feet of the wood stove, ideally on a concrete slab or insulated platform to minimize heat loss. Ensure that the water heater is sized correctly for your household’s hot water needs, with a minimum of 4 gallons per minute flow rate. A pressure relief valve and temperature and pressure relief valve are also essential safety features.

Safety and Efficiency Tips

To maximize efficiency and safety, maintain your wood stove and water heater regularly, ensuring proper airflow and clean burning conditions. Use a thermometer to monitor water temperature and adjust the water heater’s thermostat accordingly. A well-insulated water storage tank and proper piping will also help reduce heat loss and ensure consistent hot water supply. Consider adding a backup heating source, such as an electric water heater, to provide supplemental heat during extended periods of cold weather.