Quick Answer
A wood-fired water heater not heating may be due to a faulty thermosiphon system, malfunctioning stove coils, or an issue with the batch heater. Check for proper airflow and ensure the water heater is properly insulated.
Inspect the Thermosiphon System
When troubleshooting a wood-fired water heater, start by inspecting the thermosiphon system. This system relies on the density difference between hot and cold water to circulate water through the heater. Check that the temperature-controlled valve is functioning correctly and that the thermosiphon tubes are clear of debris and mineral buildup. If the system is not functioning, check for airlocks by bleeding the system at the highest point.
Check Stove Coils and Batch Heater
Next, inspect the stove coils and batch heater for any signs of malfunction. The stove coils should be free of debris and properly seated on the water heater. Check the batch heater’s temperature gauge to ensure it is reaching the desired temperature. If the batch heater is not functioning, check the electrical connections and ensure the heater is properly insulated.
Troubleshoot Airflow and Insulation
Proper airflow and insulation are crucial for a wood-fired water heater to function correctly. Ensure that the water heater is properly insulated and that there is adequate clearance around the heater for airflow. Check that the flue is not blocked and that the chimney is clear of debris. If the heater is not receiving enough airflow, check the chimney draw and adjust the damper as needed.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.