🔥 Heat Up Your Space, Not Your Worries! 🔥 Equipped with an overheat cutoff fuse for peace of mind. Sleek dimensions fit seamlessly into any indoor space. Experience the power of 199,000 BTUs for rapid heating. Enjoy a limited 12-year warranty on exchange for ultimate reliability. 4" pipe vents up to 50 feet for versatile installation. Compact 18.5" x 29.5" Size Overheat Safety Control 199,000 BTU Heat Output The AO Smith ATI-540H-N is a high-performance condensing tankless heater designed for residential and light commercial use. With a powerful heat output of 199,000 BTUs, it ensures rapid and efficient heating. Its compact design and flexible venting options make it ideal for various indoor installations, while advanced safety features provide peace of mind. Backed by a generous warranty, this heater is built to last.