If you have a tankless water heater that you suspect of overheating, it is likely caused by one of three basic problems (in order of likely occurrence):
- The thermostat is incorrectly set: you should check the setting of the thermostat and make sure it is correctly and safely set.
- The thermostat has malfunctioned: if you determine that the thermostat is correctly set but the unit is still overheating, you should call a professional to ensure that the thermostat itself is not broken and that it is sensing temperatures correctly.
- Something has gone awry with the heating element itself: again this is a job for a professional.
So if the thermostat is set correctly, our suggestion would be to call a professional as they will likely use more sophisticated knowledge and diagnostic tools than available to an average homeowner.
