Rinnai 11i Low NOx 24kW Internal Natural Gas Water Heater & Flue Kit – Hydrogen-Ready, Wall-Mounted Solution The Rinnai 11i Low NOx 24kW Internal Natural Gas Water Heater & Flue Kit is a compact, high-performance continuous flow water heating system designed to deliver hot water on demand—without the risk of running out. Engineered for energy efficiency and reliability, it’s the ideal choice for domestic and commercial properties needing hot water at variable times and volumes, such as restaurants, homes, or temporary installations. With ultra-low NOx emissions, this room-sealed, wall-mounted unit is hydrogen-ready (up to 20% blend), making it a future-proof investment. Lightweight and easy to install with a pus