A.O. Smith Voltex AL 66 Gal

Last updated: October 21, 2026

A.O. Smith Voltex AL 66 Gal

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
Check price at Lowe's$2,598

Price checked October 21, 2026. As an Amazon Associate we earn from qualifying purchases.

Pros
  • 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
Cons
  • 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 numberHPTS-66
Ratings (ENERGY STAR)
Size (nominal)66 gal
Tank volume (measured)67 gal
Uniform Energy Factor3.70
First-hour rating82 gal
Draw patternHigh
Yearly energy use1,233 kWh
Heat pump cut-off (low)37 °F
Sound level45 dB(A)
ENERGY STAR ID2408852
Installation
Power240 V
Circuit30 A, 208/240 V
Backup element4,500 W
Operating air range37 to 120 °F
Minimum room size450 cu ft
Size61 in tall, 23 in across
Weight284 lb
RefrigerantR-134a
Features
Wi-FiBuilt in
AppA. O. Smith (iCOMM)
Demand response port (CTA-2045)Yes
Leak detectionYes
ModesHybrid, Heat Pump, Electric, Vacation
Warranty and models
Warranty10 yr tank, 10 yr parts, 1 yr labor
Also sold asAmerican HPS10266H045DV, Lochinvar HPSA065KD, Reliance 10-66-DHPTS, State HPSX-66-DHPT
Released2022-06

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