Commercial Kitchen Water Heater Overflow.

No, not entirely

This is an image of a self-priming trap. It uses the waste water from a nearby sink to constantly (whenever the sink is used, anway) trickle a little water into the seldom used trap, thus preventing the familiar unpleasant sewer odor from entering your place.

some plumbing inspectors require "trap primers" to keep the trap full. Piping the pop off to outside in cold climates can drip and freeze up tight. On new construction "day light" drains, into the French drains can be used, thus a sewer back up will not flood the floor from the floor drain tied into the sanitary sewer. Also, codes require an air gap ( 1 " ) so there can not be any cross connection between drinking water and polluted water. ( plus, you can see a pop off dripping and take care of it right away.

Also, in a 100 gal. water heater, there is allot of pounds per square inch (let's say 50), so how many sq. " are inside the tank? Thermal expansion is as strong as ice and will explode the tank, so pop offs, maintained properly are a MUST Hope this

helps,,cheers.