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
The Ariston Andris RS 4 Gallon and the EcoSmart ECO MINI 4 are evenly matched, rated 4.0 and 4.0. The Ariston Andris RS 4 Gallon leads on warranty. The EcoSmart ECO MINI 4 costs $4.07 less ($165.92 vs $169.99).
Prices were last checked November 9, 2026. Product prices and availability are accurate as of that date and are subject to change; the price and availability shown on Amazon or the retailer's site at the time of purchase apply. As an Amazon Associate we earn from qualifying purchases.
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
Which should you buy?
- Choose the Ariston Andris RS 4 Gallon for warranty (6-year tank, 2-year parts vs 5-year tank, 2-year parts).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 2.5 to 4 gallon mini tank water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Ariston Andris RS 4 Gallon | EcoSmart ECO MINI 4 |
|---|---|---|
| Overall rating | 4.0/5 | 4.0/5 |
| Value 30% | 93 $42.50 per gallon ($169.99, 4 gal) | 96 $41.48 per gallon ($165.92, 4 gal) |
| Warranty 30% | 56 6-year tank, 2-year parts | 48 5-year tank, 2-year parts |
| Heating power 15% | 20 1,440 W element | 20 1,440 W element |
| Features 15% | 100 plugs into an outlet, relief valve included, wall bracket included | 100 plugs into an outlet, relief valve included, wall bracket included |
| Tank size 10% | 100 4 gal tank | 100 4 gal tank |
Specifications
| Ariston Andris RS 4 Gallon | EcoSmart ECO MINI 4 | |
|---|---|---|
| Heating | ||
| Tank capacity | 4 gal | 4 gal |
| Element | 1,440 W | 1,440 W |
| Voltage | 120 V | 120 V |
| Current | 12 A | 12 A |
| Electrical connection | Plug-in | Plug-in |
| Recovery (maker figure) | 6.8 gal/hr at 90 °F rise | 24 min max |
| Thermostat range | 65 to 161 °F | 50 to 140 °F |
| Price per gallon | $42.50 | $41.48 |
| Installation | ||
| Dimensions (H x W x D) | 14.2 x 14.2 x 12.8 in | 18.2 x 12.3 x 12.7 in |
| Weight | 17.6 lb | 21 lb |
| Water connections | 1/2" NPT | 1/2" NPT |
| Relief valve included | Yes | Yes |
| Wall bracket included | Yes | Yes |
| Warranty | ||
| Tank | 6 years | 5 years |
| Parts | 2 years | 2 years |