WETT inspections are now typically required as a part of the home insuring process. In Canada, most insurance companies require that all wood burning appliances and fireplaces be inspected by a WETT certified inspector and cleared/approved before the home can be insured.
There are three levels of WETT inspection available. While each inspection level differs in scope, all of the levels require in-depth training and at least 80 weeks of field experience.
The first and most common level is an inspection of all the readily accessible components of any wood burning appliances in the home to make sure that they are installed correctly and are installed with compliance to building codes and regulations. The inspection should also include a visit to the roof (when possible) to examine the chimney for any potential structural or ventilation issues. This is the type of inspection offered by many home inspectors for insurance purposes.
The second and third levels are more comprehensive and invasive inspections of the wood burning units and typically also include a cleaning. These types of inspections are usually performed by chimney sweeps or other wood heat specialists.