Built like a Bock Providing robust, innovative commercial water heaters built by people who care, Bock is the industry leader ... in water heater product innovations. Longest Warranty in the Industry Bock offers a five-year warranty: one of the longest in the industry. We utilize steel up to 40% thicker than our competitors. It’s protected with cobalt-rich C-Glass for the greatest possible resistance to corrosion. Manufactured in the USA Our products are proudly manufactured at our two Wisconsin locations. Midwest values and craftsmanship are built into everything we make! Employee Owned We are 100 percent employee owned. Every Bock team member is personally committed to supplying exceptional products — with the customer service and technical support you deserve. read more