Clarification is required

I recieved this notice from the TSSA

Natural Gas and Propane Fired Boilers with an Input less than 300 000 BTUH installed in a Residential Building Intended for One or Two Families
http://www.tssa.org/CorpLibrary/ArticleFile.asp?Instance=136&ID=B0267D56915A4FEBB3CA406AF218170A

This would be an added cost to our clients if they need to replace an old boiler. I would be glad to recieve some feed back on this.

Thanks,
Graciano
www.myhomeinspection.ca