Rheem Performance 100-Gallon Electric Water Heater
Rheem Performance 100-Gallon Electric Water Heater Review
The Rheem Performance 100-Gallon Electric is one of the largest residential electric tanks in Rheem's lineup. Sized for very large households (6+ people) or applications with extreme overlapping demand. The 100-gallon class is at the upper edge of residential electric — beyond this, gas conversion or tankless are typically the practical paths.
Specs: 100 gallons stored, two 4500W heating elements (240V), UEF 0.90, 116-gallon FHR, 6-year tank and parts warranty. Glass-lined steel tank, magnesium anode rod. About 65" tall × 30" diameter.
The 100-gallon capacity covers heavy household demand. Use cases: 6+ person households, multi-generational homes, small commercial applications (small restaurant, salon).
For households with basement install supporting heat-pump, AO Smith Voltex 100-gal heat-pump operating cost is dramatically lower — heat-pump nearly always wins for very-large-capacity electric demand.
About $1,200 unit, $1,900 installed.
- No combustion, no venting required — installs anywhere with 240V electrical access
- UEF 0.85 electric — well-insulated design minimizes standby loss compared to standard models
- 10-year warranty — solid above-average coverage for this class
- Large 100-gallon reserve — comfortably serves 5+ person households in peak-use periods
- 115-gallon first-hour rating — handles morning-rush simultaneous demand without shortfall
- Resistance electric has slower recovery than gas at comparable capacity — schedule heavy use to match tank recovery