A.O. Smith Voltex MAX 66 Gal
#3 in 65 GallonFull review
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
Lowe's $2,579$2,579
The A.O. Smith Voltex MAX 66 Gal is the better heat pump water heater overall, rated 3.8 to 3.7. The A.O. Smith Voltex MAX 66 Gal leads on efficiency. The A.O. Smith Voltex MAX 66 Gal costs $19 less ($2,579 vs $2,598).
A.O. Smith Voltex AL 66 Gal
#9 in 65 GallonFull review
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
Lowe's $2,598$2,598
Prices were last checked October 21, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the A.O. Smith Voltex MAX 66 Gal for efficiency (3.84 UEF vs 3.70 UEF).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 65 gallon heat pump water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | A.O. Smith Voltex MAX 66 Gal | A.O. Smith Voltex AL 66 Gal |
|---|---|---|
| Overall rating | 3.8/5 | 3.7/5 |
| Efficiency 35% | 60 3.84 UEF | 50 3.70 UEF |
| Hot water 20% | 92 83 gallons in the first hour | 88 82 gallons in the first hour |
| Warranty 20% | 75 10-year tank, 10-year parts, 1-year labor | 75 10-year tank, 10-year parts, 1-year labor |
| Cold rooms 15% | 32 heat pump runs down to 37 °F room air | 32 heat pump runs down to 37 °F room air |
| Noise 10% | 69 45 dB(A) | 69 45 dB(A) |
Specifications
| A.O. Smith Voltex MAX 66 Gal | A.O. Smith Voltex AL 66 Gal | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 66 gal | 66 gal |
| Tank volume (measured) | 68 gal | 67 gal |
| Uniform Energy Factor | 3.84 | 3.70 |
| First-hour rating | 83 gal | 82 gal |
| Draw pattern | High | High |
| Yearly energy use | 1,292 kWh | 1,233 kWh |
| Heat pump cut-off (low) | 37 °F | 37 °F |
| Sound level | 45 dB(A) | 45 dB(A) |
| ENERGY STAR ID | 3417561 | 2408852 |
| Installation | ||
| Power | 240 V | 240 V |
| Circuit | 30 A, 208/240 V | 30 A, 208/240 V |
| Backup element | 4,500 W | 4,500 W |
| Operating air range | 37 to 120 °F | 37 to 120 °F |
| Minimum room size | 450 cu ft | 450 cu ft |
| Size | 61 in tall, 23 in across | 61 in tall, 23 in across |
| Weight | 284 lb | 284 lb |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | Built in |
| App | A. O. Smith (iCOMM) | A. O. Smith (iCOMM) |
| Demand response port (CTA-2045) | Yes | Yes |
| Leak detection | Yes | Yes |
| Modes | Hybrid, Heat Pump, Hot Water+ (3 levels), Guest, Electric, Vacation | Hybrid, Heat Pump, Electric, Vacation |
| Warranty and models | ||
| Warranty | 10 yr tank, 10 yr parts, 1 yr labor | 10 yr tank, 10 yr parts, 1 yr labor |
| Also sold as | American HPA10266H045DV, Lochinvar HPPA065KD, Reliance 10-66-DHPTA, State HPAX-66-DHPT | American HPS10266H045DV, Lochinvar HPSA065KD, Reliance 10-66-DHPTS, State HPSX-66-DHPT |
| Released | 2024-03 | 2022-06 |