John is fully trained and carries a Gas Safe ID Card that allows him to carry out lawfully gas repairs, installations, and compliance testing and certification.

Domestic Gas Safe
Relates to those gas appliances that are designed for use in a domestic property, as well as gas pipework up to 35mm in diameter, again in domestic property.

Note: There may be instances in larger domestic properties where non-domestic appliances and larger pipework maybe required. In these cases appropriate non-domestic work categories may be necessary.

Commercial Gas Safe
In the context of work categories and competence, this refers to the size of pipework, appliance type/gas consumption in addition to the property type. However, the property type is not the sole criteria. For example, a ‘domestic’ gas boiler installed in a church may in certain circumstances still be considered a ‘domestic’ appliance regardless of being installed in a ‘non domestic’ property.

Often appropriate competence can only be determined on a case by case basis.