EcoSmart ECO MINI 4
An inexpensive 4 gallon plug-in tank for a kitchen or utility sink. Its warranty is a year shorter than the best small tanks.
Amazon $165.92$165.92
4 gal1,440 WPlug-in
4.0/5
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.
- 4 galTank
- 1,440 WElement
- Plug-inPower
- 6 yearsTank warranty
Check price at Amazon$169.99
Price checked November 9, 2026. As an Amazon Associate we earn from qualifying purchases.
Pros
- Four gallons for about the price of most 2.5 gallon tanks
- Plugs in, with the relief valve already fitted
- Six-year tank and two-year parts warranty
Cons
- 14.25 in wide, so measure the cabinet first
The Ariston Andris RS family
Every Ariston Andris RS model we rank, smallest first. Ratings compare each against its own size.
| Model | Tank | Rating | Price |
|---|---|---|---|
| Ariston Andris RS 2.5 Gallon | 2.5 gal | 3.2/5 | $159.99 |
| Ariston Andris RS 4 Gallon (this one) | 4 gal | 4.0/5 | $169.99 |
| Ariston Andris RS 8 Gallon | 8 gal | 3.4/5 | $209.99 |
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 | ANDRIS RS 4U 1.4KW |
|---|---|
| Heating | |
| Tank capacity | 4 gal |
| Element | 1,440 W |
| Voltage | 120 V |
| Current | 12 A |
| Electrical connection | Plug-in |
| Recovery (maker figure) | 6.8 gal/hr at 90 °F rise |
| Thermostat range | 65 to 161 °F |
| Price per gallon | $42.50 |
| Installation | |
| Dimensions (H x W x D) | 14.2 x 14.2 x 12.8 in |
| Weight | 17.6 lb |
| Water connections | 1/2" NPT |
| Relief valve included | Yes |
| Wall bracket included | Yes |
| Warranty | |
| Tank | 6 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
Compare
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