Ariston Andris RS 4 Gallon
A 4 gallon plug-in tank at a 2.5 gallon price, with a six-year tank warranty. A strong pick for a kitchen sink.
Amazon $169.99$169.99
4 gal1,440 WPlug-in
4.0/5
An inexpensive 4 gallon plug-in tank for a kitchen or utility sink. Its warranty is a year shorter than the best small tanks.
- 4 galTank
- 1,440 WElement
- Plug-inPower
- 5 yearsTank warranty
Check price at Amazon$165.92
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Lowest price for a 4 gallon tank here
- Plugs into a shared 120 V outlet
- Relief valve and wall bracket included
Cons
- Five-year leak warranty, a year shorter than Rheem and Ariston
- Actual tank volume is 3.8 gallons
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 | ECO MINI 4 |
|---|---|
| Heating | |
| Tank capacity | 4 gal |
| Element | 1,440 W |
| Voltage | 120 V |
| Current | 12 A |
| Electrical connection | Plug-in |
| Recovery (maker figure) | 24 min max |
| Thermostat range | 50 to 140 °F |
| Price per gallon | $41.48 |
| Installation | |
| Dimensions (H x W x D) | 18.2 x 12.3 x 12.7 in |
| Weight | 21 lb |
| Water connections | 1/2" NPT |
| Relief valve included | Yes |
| Wall bracket included | Yes |
| Warranty | |
| Tank | 5 years |
| Parts | 2 years |
Alternatives in this size
Camplux ME40 4 Gallon
A narrow 4 gallon plug-in tank that fits where wider tanks don’t. Its tank warranty is shorter than the major brands.
Amazon $209.99$209.99
4 gal1,440 WPlug-in
Stiebel Eltron SHC 4
A 4 gallon plug-in tank for a kitchen sink or as a booster on a long pipe run, with a six-year tank warranty. Cheaper 4 gallon tanks match its warranty and heat faster.
Amazon $239$239
4 gal1,300 WPlug-in
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