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.
3.5/5
The Midea original behind several heaters here, sold through HVAC contractors. Buy whichever version is easiest to get with the warranty you want.
- 50 galSize
- 3.75UEF
- 69 galFirst hour
- 240 VPower
- 37.4 °FRuns down to
- 10 yr tankWarranty
See it at Midea
No store we check sells it online; the maker lists where to buy or who installs it.
Pros
- The original design behind the Rinnai, Bosch, Senville and ACiQ heaters here
- Built-in Wi-Fi: set schedules and vacation mode from the Midea SmartHome app
Cons
- Parts are covered 5 years unless registered (then 10)
- Louder than most at 49 dB(A); best kept away from bedrooms
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 | MAHW-50VN3A |
|---|---|
| Ratings (ENERGY STAR) | |
| Size (nominal) | 50 gal |
| Tank volume (measured) | 47 gal |
| Uniform Energy Factor | 3.75 |
| First-hour rating | 69 gal |
| Draw pattern | Medium |
| Yearly energy use | 855 kWh |
| Heat pump cut-off (low) | 37.4 °F |
| Sound level | 49 dB(A) |
| ENERGY STAR ID | 3543523 |
| Installation | |
| Power | 240 V |
| Circuit | 30 A, 208/240 V |
| Backup element | 4,500 W |
| Operating air range | 37 to 109 °F |
| Size | 47.9 in tall, 18.3 in across |
| Weight | 218 lb |
| Refrigerant | R-134a |
| Features | |
| Wi-Fi | Built in |
| App | Midea SmartHome |
| Demand response port (CTA-2045) | Yes |
| Leak detection | No |
| Modes | Economy, Heat Pump, Hybrid, E-Heater, Vacation |
| Warranty and models | |
| Warranty | 10 yr tank, 10 yr parts |
| Also sold as | Kepler AZMCHW-50VN3A, Eco-Logical ECO-50HPM1A, Alsetria HPWH-50G, ECO-AIR HPWH-50G, NOVAIR TCL-50GL-R134A, Custom Comfort CCOHPWH50A |
| Released | 2023-11 |
Alternatives in this size
ACiQ 50 Gal Hybrid
#9 in 40–50 GallonFull review
The Midea-built design, sold direct by an online HVAC store, for a buyer installing it themselves who doesn’t need labor cover.
Amazon $1,799.99 ACiQ$1,799.99
A.O. Smith Voltex MAX 50 Gal
#11 in 40–50 GallonFull review
A solid 240 V heater with leak protection included, sold at Lowe’s as the Signature 900 line.
Lowe's $2,229$2,229
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