The Midea-built design with Bosch’s name and warranty, sold at Lowe’s.
Lowe's $3,550
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
- 66 galSize
- 3.70UEF
- 82 galFirst hour
- 240 VPower
- 37 °FRuns down to
- 10 yr tankWarranty
Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.
- Comes with a leak sensor and automatic shut-off valve
- Delivers 82 gallons of hot water in the first hour, a lot for its size
- Built-in Wi-Fi: set schedules and vacation mode from the A. O. Smith (iCOMM) app
- Switches to the backup element when the room drops below 37 °F, so it saves little in a freezing garage
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 | HPTS-66 |
|---|---|
| Ratings (ENERGY STAR) | |
| Size (nominal) | 66 gal |
| Tank volume (measured) | 67 gal |
| Uniform Energy Factor | 3.70 |
| First-hour rating | 82 gal |
| Draw pattern | High |
| Yearly energy use | 1,233 kWh |
| Heat pump cut-off (low) | 37 °F |
| Sound level | 45 dB(A) |
| ENERGY STAR ID | 2408852 |
| Installation | |
| Power | 240 V |
| Circuit | 30 A, 208/240 V |
| Backup element | 4,500 W |
| Operating air range | 37 to 120 °F |
| Minimum room size | 450 cu ft |
| Size | 61 in tall, 23 in across |
| Weight | 284 lb |
| Refrigerant | R-134a |
| Features | |
| Wi-Fi | Built in |
| App | A. O. Smith (iCOMM) |
| Demand response port (CTA-2045) | Yes |
| Leak detection | Yes |
| Modes | Hybrid, Heat Pump, Electric, Vacation |
| Warranty and models | |
| Warranty | 10 yr tank, 10 yr parts, 1 yr labor |
| Also sold as | American HPS10266H045DV, Lochinvar HPSA065KD, Reliance 10-66-DHPTS, State HPSX-66-DHPT |
| Released | 2022-06 |
Alternatives in this size
A Midea-built heater with Rinnai’s support network and one of the few listings on Amazon. Check the seller is a Rinnai-authorized dealer before buying.
Amazon $1,657.02The Midea original behind several heaters here, sold through HVAC contractors. Buy whichever version is easiest to get with the warranty you want.
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