Quick Answer
Yes, installing a backup system for your propane tankless heater is a good idea, especially if you live off-grid and rely on the heater for water heating. A backup system can provide an alternate source of heat in case the primary propane supply is interrupted. This can ensure a continuous water supply, even during periods of extreme cold or propane shortages.
Sizing and Demand Considerations
When sizing a backup system for your propane tankless heater, consider the minimum flow rate required to meet your household demands. A general rule of thumb is to calculate your minimum flow rate based on the number of people in your household and their simultaneous water usage. For example, a household of four people may require a minimum flow rate of 8-10 gallons per minute (GPM). You’ll also need to consider the temperature difference between the cold water supply and the desired hot water temperature. A 20-25 degree Fahrenheit temperature difference is a good starting point.
Freeze Protection and Venting
Freeze protection is crucial for propane tankless heaters, especially in cold climates. A backup system can provide an alternate heat source to prevent the tankless heater from freezing and shutting down. Proper venting is also essential to ensure the safe operation of the tankless heater. A minimum of 6 inches of clearance is required between the heater’s vent termination point and any combustible materials. You should also ensure that the venting system is sized correctly to handle the maximum exhaust gas flow rate, which is typically 3-5 CFM per 10,000 BTU of heater capacity.
Backup System Options
A backup system can be powered by a variety of sources, including a secondary propane tank, a diesel generator, or even a solar-powered thermoelectric generator. Consider the reliability, maintenance requirements, and cost of ownership when selecting a backup system. A secondary propane tank can provide a reliable backup source, but it may require additional storage space and piping. A diesel generator can provide a high-capacity backup source, but it may require regular maintenance and fuel storage. A solar-powered thermoelectric generator can provide a quiet, low-maintenance backup source, but it may require additional space and a large solar array.
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