Gas-, propane- and oil-fired equipment and components may only be installed in Ontario if they bear a certification mark of an approved certification body.
Certification marks for gas-, propane- and oil-fired equipment can be applied by a certification body accredited by the Standards Council of Canada (SCC) where a nationally recognized standard exists. Visit the SCC for a complete list of certification bodies, recognized listing marks and contact information.
Below are the most common certification or approval marks for gas-, propane- and oil-fired appliances in Ontario.
CSA – Canadian Standards Association
 |  |  |
“C” – when used refers to approval for Canada. “US” – when used refers to approval for United States. | ||
CGA - Canadian Gas Association (Now part of CSA)
 |  |
| * Used for gas components only. | |
ULC – Underwriters Laboratory of Canada
 |  | |
 | ||
| Note: Previous ULC marks did not have the words “Listed or Listed Homologué.” | ||
UL - Underwriters Laboratory
 |  |
Mark used for recognized components. “C” – when used refers to approval for Canada. “US” – when used refers to approval for United States. | |
Intertek Testing Services NA Inc.
 | |
 |  |
“C” – when used refers to approval for Canada. “US” – when used refers to approval for United States. * Also available without the “US.” Note: Previous Warnock Hersey marks did not have the “C” or “US” but had the words “Certified for use in Canada” or “Certified for use in Canada and United States” plus the French equivalent. Previous ETL marks may not have the word “listed”. | |
OMNI – Test Laboratories Inc.
 |
| “C” – refers to approval for Canada. |
ICC – Evaluation Service
 |
“C” – refers to approval for Canada. |
PFS Corporation
QAI Laboratories Ltd.
 |
Note: QAI's scope is limited to camping equipment and manufactured / mobile homes and trailers. “C” – when used refers to approval for Canada. “US” – when used refers to approval for United States |
Lab Test Certification Inc.
 |
“C” – when used refers to approval for Canada. “US” – when used refers to approval for United States. |