Can You Use a Propane Tankless Heater for Hydronic Heating?

Sizing Considerations

When using a propane tankless water heater for hydronic heating, it’s essential to size the unit correctly to match the heating demand. A general rule of thumb is to size the heater for 30-50% of the total heat loss of the space. For example, if a 1,500 sqft space has a heat loss of 40,000 BTU/h, a 12-20 kW propane tankless heater would be a suitable choice. Consult with a professional to determine the specific sizing requirements for your application.

Venting and Safety

Propane tankless heaters require proper venting to ensure safe operation and prevent carbon monoxide buildup. A direct vent or power vent setup is recommended to provide a secure and efficient path for exhaust gases. Additionally, ensure the heater is installed in a well-ventilated area, and follow local building codes and regulations for propane heater installation. Proper venting can also help to prevent damage to the heater and adjacent structures.

Freeze Protection and Demand

To prevent damage from freezing temperatures, consider installing a freeze protection device or a secondary heat source, such as a backup electric or oil-fired heater, to maintain a minimum temperature of 40°F (4°C) in the heat exchanger. This will help to prevent damage to the heater and ensure continuous operation during cold snaps. In terms of demand, a propane tankless heater can provide a high level of temperature control and responsiveness, making it an excellent choice for applications where precise temperature control is required, such as in commercial or industrial settings.