AO Smith Cyclone Xi 75-Gallon Commercial Gas Water Heater (FCG-75)
AO Smith Cyclone Xi 75-Gallon Commercial Gas Water Heater (FCG-75) Review
The AO Smith Cyclone Xi 75-Gallon Commercial Gas (FCG-75) is a commercial-grade large-capacity gas water heater. The "FCG-75" identifies the 75-gallon variant in the Cyclone commercial line.
Specs: 75 gallons stored, 199,000 BTU input, UEF 0.97 condensing, 240-gallon FHR, 8-year tank warranty. Power-vent PVC venting. Cyclone heat exchanger uses spiral flow paths for maximum heat transfer.
The Cyclone Xi 75-gallon serves light commercial applications (small restaurants, salons, small multi-family residential) or very-large residential (6+ bath homes with overlapping demand). The UEF 0.97 is among the highest in the gas tank category.
About $4,200 unit, $6,500-$8,500 installed depending on venting work. Right buyer: small commercial application or very-large residential where parallel tankless install would otherwise be required.
- Natural gas combustion — faster recovery than electric resistance at comparable tank size
- UEF 0.85 — above federal minimum EF 0.62; solid efficiency for a non-condensing gas unit
- 75-gallon capacity — right-sized for 3–4 person households with standard usage patterns
- 185-gallon first-hour rating — handles morning-rush simultaneous demand without shortfall
- 3-year warranty — well below the 8–12 year category average; extended warranty advisable
- Atmospheric venting requires vertical B-vent — less routing flexibility than power-vent or condensing alternatives