A.O. Smith Voltex MAX 40 Gal
#17 in 40–50 GallonFull review
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
Lowe's $2,098$2,098
2.8/5
The ProTerra for a home that only has a 15 A, 240 V circuit, such as one left by a small electric tank: it avoids rewiring but gives up some efficiency and first-hour delivery.
- 40 galSize
- 3.45UEF
- 46 galFirst hour
- 240 VPower
- 37 °FRuns down to
- 10 yr tankWarranty
See it at Rheem
No store we check sells it online; the maker lists where to buy or who installs it.
Pros
- Built-in Wi-Fi: set schedules and vacation mode from the EcoNet app
- 10-year tank and parts warranty plus 1 year of labor
Cons
- Its 2,250 W backup element is half the usual size, so the tank recovers slowly when the heat pump can’t keep up
- Only 46 gallons in the first hour, so back-to-back showers can run it out
How it scores
The rating comes from 5 measured or published factors, each scored 0-100 against fixed reference points for its size. How we rank explains each one.
Specifications
| Model number | XE40T10H22U1 |
|---|---|
| Ratings (ENERGY STAR) | |
| Size (nominal) | 40 gal |
| Tank volume (measured) | 36 gal |
| Uniform Energy Factor | 3.45 |
| First-hour rating | 46 gal |
| Draw pattern | Low |
| Yearly energy use | 643 kWh |
| Heat pump cut-off (low) | 37 °F |
| Sound level | 45 dB(A) |
| ENERGY STAR ID | 3554171 |
| Installation | |
| Power | 240 V |
| Circuit | 15 A, 208/240 V |
| Backup element | 2,250 W |
| Operating air range | 37 to 145 °F |
| Minimum room size | 700 cu ft |
| Size | 62.3 in tall, 20.3 in across |
| Weight | 166 lb |
| Refrigerant | R-134a |
| Features | |
| Wi-Fi | Built in |
| App | EcoNet |
| Demand response port (CTA-2045) | Yes |
| Leak detection | No |
| Modes | Energy Saver, Heat Pump, High Demand, Electric, Vacation |
| Warranty and models | |
| Warranty | 10 yr tank, 10 yr parts, 1 yr labor |
| Also sold as | Friedrich PROH40 T2 FD400-15, Rheem PROPH40 T2 RH375-15, Rheem PROPH40 T2 RH400-15, Richmond 10E40-HP5U15, Ruud PROUH40 T2 RU375-15, Ruud PROUH40 T2 RU400-15 |
| Released | 2020-04 |
Alternatives in this size
GE Profile 50 Gal 120V
#18 in 40–50 GallonFull review
The most efficient 120 V plug-in here, and the quietest, for replacing a gas tank without new wiring. It can be rewired for 240 V later if the household outgrows it.
GE Appliances PC Richard $2,639.97$2,639.97
GE Profile 40 Gal 120V
#20 in 40–50 GallonFull review
The most efficient 120 V plug-in here, and the quietest, for replacing a gas tank without new wiring. It can be rewired for 240 V later if the household outgrows it.
GE Appliances PC Richard $2,529.97$2,529.97
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