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1. | A O Smith Boiler GB 1500 ManualSTACK-RACK SPACE SAVING GENESIS STACK-RACK Install two Genesis boilers in the footprint of one! Up to 5 Million BTU's! Install four Genesis boilers in the footprint of two! Up to 10 million BTU's! Saves valuable floor space! Get the fire power you need in those tight hard to fit boiler rooms! Sturdy - The Stack-Rack is made of heavy angle and tubular steel. It is designed to be a sturdy and stable platform for the top mounted boiler. The upper boiler is mounted using heavy clamps that lock a... Brands:A | User Manual | ENGLISH | [View] | ||||||||||