A.O. Smith Signature 900 66-Gallon Tall 10-year Warranty 240-volt Smart Hybrid Grid Capable Heat Pump Water Heater with Leak Detection, Automatic Shut-off and Hot Water Plus
Item #5374506 |
Model #HPA10-66H45DV
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Innovative Digital Smart Valve - Use Guest Mode or Hot Water Plus mode to get up to 40% more hot water when you need it.
4X Advanced Energy Savings -Saving you up to $607 per year on your energy bills
Eligible for $2,000 Federal Tax Credit, additional rebates may apply (see Lowe's rebate center for details)
Ideal hot water delivery for 5 to 6 person households, when sized appropriately
iCOMM™ smart connectivity allows you to get notifications and manage your hybrid electric heat pump water heater from your smartphone
Leak Watch® smart technology provides instant leak alerts for added peace of mind
Leak Shield® shut-off valve automatically shuts off the water supply when a leak is detected (accessory included)
Grid-Capable design reduces energy costs and operates quietly at 45 dB
Two back-up 4,500-watt copper heating elements provide a first hour delivery of 65 gallons
General | |||
|---|---|---|---|
Color/Finish Family | Gray | Grade | Residential |
Series Name | Signature 900 Series | Use Location | Indoor |
Type | Tank | Display Type | Digital |
Power Source | Electric | ||
Dimensions | |||
|---|---|---|---|
Depth (Inches) | 26.5 | Nominal Capacity (Gallons) | 66 |
Diameter (Inches) | 26.5 | Water Connection Size | 3/4-in |
Family Size | 6 | Weight (lbs.) | 262 |
Height (Inches) | 61.5 | Width (Inches) | 26.5 |
Insulation Thickness (Inches) | 2.5 | ||
Features | |||
|---|---|---|---|
Annual Fuel Utilization Efficiency % (Percentage) | 0 | Scale Prevention | No |
Decibel Rating | 45 | Super High Efficiency | Yes |
Foam Insulation | Yes | Temperature and Pressure Relief Valve | Yes |
Grid Capable | Yes | Uniform Energy Factor | 3.84 |
High Efficiency | Yes | Voice Controlled | No |
Hybrid Heat Pump Technology | Yes | Voltage (Volts) | 240 |
Leak Detection | Yes | Water Connection Location | Top/Side |
Overheat Shut-Off | Yes | Water Heater Style | Tall |
Point of Use | No | Wattage (Watts) | 4500 |
Compatibility | |||
|---|---|---|---|
Bluetooth Compatibility | Yes | Works with iOS | Yes |
Smart Compatible | Yes | Works with SmartThings | No |
Wi-Fi Compatibility | Yes | Works with the Google Assistant | No |
Works with Amazon Alexa | No | For Use with Mobile Homes | Yes |
Works with Android | Yes | For Use with RVs | No |
Works with Apple HomeKit | No | ||
Warranty | |||
|---|---|---|---|
Warranty | 10-year limited | ||
Certifications | |||
|---|---|---|---|
CA Residents: Prop 65 Warning(s) | Safety Listing | UL safety listing | |
ENERGY STAR Certified | Yes | AHRI Certified | Yes |
Miscellaneous | |||
|---|---|---|---|
UNSPSC | 40101800 | ||
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Ratings may include incentivized customer reviews.
What Customers Are Saying
Customers report overwhelming dissatisfaction, with most experiencing repeated unit failures within months or a few years despite premium pricing. Common issues include heat pump breakdowns, coolant leaks from defective welds, and ECC fault codes. The companion app is non-functional for nearly all users—failing to connect, recognize serial numbers, or retain login credentials. Warranty coverage excludes labor costs, forcing customers to pay hundreds out-of-pocket for replacements. Support representatives offer contradictory advice and no real solutions. A few report initial success, but subsequent failures dominate. Most describe the product as unreliable and overpriced, with promised energy savings negated by constant breakdowns.
Customer review summary generated by AI, including incentivized reviews.I've have this for 2 years
well today makes 6 months on the 4th replacement of this hot garbage
Compressor stopped working after 2 years!
Replacement labor cost estimated at 3,000$, and Lowe's does not guarantee replacement, so I need to pay for a new water heater out of pocket and pray for a refund! (A.O Smith already approved the replacement, but Lowe's does not accept it). Worst device! worst Customer support!
We're sorry to hear of your experience.
We want to ensure you receive the warranty coverage included with your purchase.
Pl...
Two AO 900's in 15 Months!
Purchased the first AO Smith 900 from Lowes in November 2024. It had to be replaced in December 2025 (until replaced $1200 installation fee). Now only 3 months later the new unit is leaking and needs to be replaced AGAIN! AO Smith customer service will not do anything about installation and if they do it's $200 within the first year and that's all! This unit needs to be recalled and we all need to be made whole. Are they any class action attorney's out there that want to take this one? ...
DO NOT PURCHASE!!
Worse experience buying this unit after two months it wouldn’t heat properly, kept tripping breaker, and started leaking through front access panel. Called for replacement under 90 days had to get someone to haul away old and deliver new as AO would only offer $200 for assistance bought a different model of course as they weren’t even willing to cover having a new one installed couldn’t buy again and trust this unit with another $1200-$1800 installation charge coming never again trust me do not ...
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Please send your phone number to [email protected]...
Replacement has failed after a year
the first AO Smith hybrid failed after 18 months -- Was replaced under warranty --- Since the new replacement unit was installed we needed to change out the circult board after about 1 year --- Now 6 months after replacing the circult board -- the hot water heater runs continuosly in a basement that is approx 69 degrees yea.r round This product is not worth the trouble or the cost
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It doesn't work in the winter.
This is a total scam. I bought a unit less than a week ago, and it's already malfunctioning and not heating because the heater needs to be in an environment above 40 degrees, And AO Smith customer service told me: "Sir, you have to buy an electric heater for the AO Smith heater to work." What?! This is a complete rip-off, and they won't refund my money.
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Please send your phone number to [email protected]...
poor
heat pump went out after 2 years
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Please send your phone number to [email protected]...
Bad quality, app doesn't work
This tank hasn't been working from minute one. Mixing valve was defective, but AO Smith wouldn't replace it. Had to do it myself. App doesn't work, even today 6 months after installation. AO Smith is unable to fix it
Defective factory mixing valve, app not working
I installed this heater in September and as soon as I turned the water on, it started leaking. It turned out it was a mixing valve sitting in the top portion of the tank. Tech support offered me to disconnect the heater and bring it back to Lowes for replacement and then install the new one again. All at my expense. They would not send someone over to fix it. I ended up replacing the valve myself. I removed the top grill and figured out what's going on. Tech support mailed a new valve to me and...
From Signature 900 66-Gallon Tall 10-year Warranty 240-volt Smart Hybrid Grid Capable Heat Pump Water Heater with Leak Detection, Automatic Shut-off and Hot Water Plus Verified PurchaserVerified Pro
Takes hours to heat up, customer support is lousy
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Please send your phone number to [email protected]...
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How much does water temp. Need to drop before heat pump activates to recover
ron on April 1, 20250
Answers

This tool is not an exact fit, but does work on most heating elements. If the water heater has not
been maintained, a 1-1/2 inch socket with a ...