The Cyclone Xi series is AO Smith's commercial-residential and light-commercial gas water heater line — high-capacity, high-BTU tanks for restaurants, multi-family residential, in-home daycares, B&Bs, and estate-class residential.
The Cyclone Xi lineup
- Cyclone Xi 50G (FCG-50) — entry commercial tier
- Cyclone Xi 60G (BTH-120) — compact commercial
- Cyclone Xi 75G (FCG-75) — atmospheric commercial 75G
- Cyclone Mxi 100G (BTH-150) — volume light-commercial pick
- Cyclone Xi 100G (BTH-199) — 199K BTU condensing
- Cyclone Xi 100G (BTH-300) — 300K BTU high-recovery
- Cyclone Xi 119G (BTH-500) — 500K BTU peak commercial
Cyclone Xi technology
The Cyclone Xi uses helical-fin tube heat exchanger technology for 95-96% thermal efficiency. Combined with intelligent ignition and modulating gas control, it's one of the most efficient commercial gas tank designs available.
Commercial warranty
3-year tank, 1-year parts — commercial duty cycle. See our warranty hub.
When commercial overkill applies
For estate-class residential at 7+ occupants, the ProLine Master 75G at 10-year residential warranty is usually correct sizing instead of Cyclone Xi. Step into Cyclone Xi only when peak demand truly exceeds 115 GPH FHD.
Bottom line
Cyclone Xi is for: small restaurants, hair salons, in-home daycares, 12-20 unit apartment buildings, B&Bs with 4+ rooms. Commercial-certified installer required.