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 is the better mini tank water heater overall, rated 4.0 to 3.5. The Ariston Andris RS 4 Gallon leads on value and warranty. The Ariston Andris RS 4 Gallon costs $40 less ($169.99 vs $209.99).
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.
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
Which should you buy?
- Choose the Ariston Andris RS 4 Gallon for value ($42.50 per gallon ($169.99, 4 gal) vs $52.50 per gallon ($209.99, 4 gal)) and warranty (6-year tank, 2-year parts vs 3-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 | Camplux ME40 4 Gallon |
|---|---|---|
| Overall rating | 4.0/5 | 3.5/5 |
| Value 30% | 93 $42.50 per gallon ($169.99, 4 gal) | 66 $52.50 per gallon ($209.99, 4 gal) |
| Warranty 30% | 56 6-year tank, 2-year parts | 30 3-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 | Camplux ME40 4 Gallon | |
|---|---|---|
| Heating | ||
| Tank capacity | 4 gal | 4 gal |
| Element | 1,440 W | 1,440 W |
| Voltage | 120 V | 120 V |
| Current | 12 A | - |
| Electrical connection | Plug-in | Plug-in |
| Recovery (maker figure) | 6.8 gal/hr at 90 °F rise | - |
| Thermostat range | 65 to 161 °F | 50 to 149 °F |
| Price per gallon | $42.50 | $52.50 |
| Installation | ||
| Dimensions (H x W x D) | 14.2 x 14.2 x 12.8 in | 19.2 x 11.8 x 10.4 in |
| Weight | 17.6 lb | 18.2 lb |
| Water connections | 1/2" NPT | 1/2" NPT |
| Relief valve included | Yes | Yes |
| Wall bracket included | Yes | Yes |
| Warranty | ||
| Tank | 6 years | 3 years |
| Parts | 2 years | 2 years |