It works i used product in bathtub where water was running out slow water is flowing freely again! On an open-vented system, if the pilot flame is lit but you don’t have any heat or hot water, you may find the ball valve is stuck in the feed and expansion tank. As the owner, i answer the phone personally - monday thru friday… no muss no fuss!!! I have a service plan with benjamin franklin plumbing, and they also take great care of me and my home. With no.