Is a Propane Tankless Water Heater Worth It for Off-Grid Living?

Sizing and Installation Requirements

When selecting a propane tankless water heater for off-grid living, it’s essential to choose a unit that matches the household’s water demand. A general rule of thumb is to select a unit with a minimum flow rate of 4-6 gallons per minute (GPM) for a single-family home. For example, a family of four might require a 7-9 GPM unit. Proper installation, including proper venting and gas line sizing, is also critical to ensure safe and efficient operation.

Venting and Freeze Protection

Propane tankless water heaters require proper venting to remove combustion byproducts and prevent carbon monoxide buildup. This typically involves a vertical venting system, which can add significant installation costs. To mitigate the risk of freezing, consider installing a freeze protection kit, which can help maintain a minimal flow of water through the unit during extremely cold temperatures. This can be particularly important in areas where temperatures frequently drop below 20°F (-7°C). Some popular freeze protection options include using a recirculating pump or installing a dedicated freeze protection valve.

Demand and Cost Considerations

While propane tankless water heaters offer energy efficiency benefits, they can be more expensive to purchase upfront compared to traditional tank-style water heaters. However, their energy savings over time can be substantial. To calculate the potential cost savings, consider the unit’s energy efficiency rating and the household’s water usage patterns. For example, if a household uses 80 gallons of hot water per day and the unit is 90% efficient, the cost savings compared to a traditional 50% efficient tank-style water heater could be significant over time.