Quick Answer
A portable propane heater can be modified to provide hot water, but it's not a direct solution. Typically, a dedicated propane tankless water heater is a better option for this purpose. However, some portable heaters can be repurposed with additional components for hot water generation.
Sizing a Portable Heater for Hot Water
When repurposing a portable propane heater for hot water, it’s essential to size the heater correctly to avoid inadequate performance or overheating. A general rule of thumb is to select a heater with a power output of at least 30,000 to 40,000 BTUs (8.9-11.7 kW) to heat 20 gallons of water by 20°F (11°C). For example, a 35,000 BTU (10.3 kW) heater would be sufficient for a small household with moderate hot water demands.
Venting and Safety Considerations
Proper venting is crucial when repurposing a portable heater for hot water, as it can produce significant exhaust gases. Ensure the heater is installed with a direct vent pipe that extends at least 6 feet (1.8 meters) above the roof or a safe distance from any windows or doors. Additionally, install a dedicated shut-off valve for the propane supply line to facilitate easy heater maintenance and winterization.
Freeze Protection and Demand Management
To prevent damage from freezing temperatures, consider installing a freeze protection system, such as a thermostatic mixing valve or a frost-proof spigot, to regulate the water temperature. To manage hot water demand, consider installing a separate timer or thermostat to regulate the heater’s operation. This can help prevent overheating and ensure a consistent supply of hot water during peak demand periods.
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