This is a continuation of a summary of the significant code changes to the 2021 Uniform Plumbing Code (UPC) which is developed and promoted by the International Association of Plumbing and Mechanical Officials. 

A continued summary of significant revisions of the Uniform Plumbing Code to be published in the 2021 edition: backflow prevention devices, water distribution piping and check valves on water heaters.

A continued summary of significant revisions of the Uniform Plumbing Code to be published in the 2021 edition: water heaters for emergency eyewash, electric tankless water heaters, water heater efficiency.