Ariston NUOS Side-Connect 65 Gal
#11 in 65 GallonFull review
A non-Midea design with a leak sensor built in and a 10-year tank and parts warranty, sold through plumbing dealers. It is louder than most here.
The Ariston NUOS Side-Connect 65 Gal rates 3.6 among 65 gallon heat pump water heaters; the Ariston NUOS Side-Connect 50 Gal rates 3.5 among 40–50 gallon ones.
Ariston NUOS Side-Connect 50 Gal
#8 in 40–50 GallonFull review
A non-Midea design with a leak sensor built in and a 10-year tank and parts warranty, sold through plumbing dealers. It is louder than most here.
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.
Scores side by side
These two sit in different size classes (65 gallon and 40–50 gallon), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Ariston NUOS Side-Connect 65 Gal | Ariston NUOS Side-Connect 50 Gal |
|---|---|---|
| Overall rating | 3.6/5 | 3.5/5 |
| Efficiency 35% | 61 3.85 UEF | 54 3.75 UEF |
| Hot water 20% | 72 78 gallons in the first hour | 72 68 gallons in the first hour |
| Warranty 20% | 70 10-year tank, 10-year parts | 70 10-year tank, 10-year parts |
| Cold rooms 15% | 40 heat pump runs down to 35 °F room air | 40 heat pump runs down to 35 °F room air |
| Noise 10% | 43 49.1 dB(A) | 43 49.1 dB(A) |
Specifications
| Ariston NUOS Side-Connect 65 Gal | Ariston NUOS Side-Connect 50 Gal | |
|---|---|---|
| Ratings (ENERGY STAR) | ||
| Size (nominal) | 65 gal | 50 gal |
| Tank volume (measured) | 62 gal | 45 gal |
| Uniform Energy Factor | 3.85 | 3.75 |
| First-hour rating | 78 gal | 68 gal |
| Draw pattern | High | Medium |
| Yearly energy use | 1,289 kWh | 867 kWh |
| Heat pump cut-off (low) | 35 °F | 35 °F |
| Sound level | 49.1 dB(A) | 49.1 dB(A) |
| ENERGY STAR ID | 3942614 | 3942616 |
| 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 | 36 to 120 °F | 36 to 120 °F |
| Minimum room size | 700 cu ft | 700 cu ft |
| Size | 50 in tall, 20.2 in across | 45.8 in tall, 18.2 in across |
| Refrigerant | R-134a | R-134a |
| Features | ||
| Wi-Fi | Built in | Built in |
| App | Ariston NET | Ariston NET |
| Demand response port (CTA-2045) | Yes | Yes |
| Leak detection | Yes | Yes |
| Modes | Comfort, Green, Fast, Electric, Vacation | Comfort, Green, Fast, Electric, Vacation |
| Warranty and models | ||
| Warranty | 10 yr tank, 10 yr parts | 10 yr tank, 10 yr parts |
| Also sold as | American Standard ASHPWH-65*****, Lennox WHHP065T45MD240S**** | American Standard ASHPWH-50*****, Lennox WHHP050T45MD240S**** |
| Released | 2024-12 | 2024-12 |