How its Made – High Efficency Water Heaters
< iframe width="480" height="320" src="https://www.youtube.com/embed/gRLJgd1M1Y4?rel=0" frameborder="0" allowfullscreen >< img design="float: left; margin:0 5px 5px 0;" src="https://rcszaboplumbing.blog/wp-content/uploads/2022/10/KccyXU.jpg"/ > From the How its made series How High Performance Water Heaters are made
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