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 rates 4.0 among 2.5 to 4 gallon mini tank water heaters; the Ariston POU 6 Gallon rates 2.8 among 6 to 10 gallon ones. The Ariston Andris RS 4 Gallon costs $113.88 less ($169.99 vs $283.87).
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.
Ariston POU 6 Gallon
A 6 gallon tank with six years on parts and tank, for a sink or booster you want to forget about. It costs more than plug-in rivals.
Amazon $283.87$283.87
Scores side by side
These two sit in different size classes (2.5 to 4 gallon and 6 to 10 gallon), and each is scored against the reference points for its own class, so a rating says how well each does among its own size peers. How we rank explains each factor.
| Factor weight | Ariston Andris RS 4 Gallon | Ariston POU 6 Gallon |
|---|---|---|
| Overall rating | 4.0/5 | 2.8/5 |
| Value 30% | 93 $42.50 per gallon ($169.99, 4 gal) | 6 $47.31 per gallon ($283.87, 6 gal) |
| Warranty 30% | 56 6-year tank, 2-year parts | 83 6-year tank, 6-year parts |
| Heating power 15% | 20 1,440 W element | 29 1,500 W element |
| Features 15% | 100 plugs into an outlet, relief valve included, wall bracket included | 35 relief valve included |
| Tank size 10% | 100 4 gal tank | 0 6 gal tank |
Specifications
| Ariston Andris RS 4 Gallon | Ariston POU 6 Gallon | |
|---|---|---|
| Heating | ||
| Tank capacity | 4 gal | 6 gal |
| Element | 1,440 W | 1,500 W |
| Voltage | 120 V | 120 V |
| Current | 12 A | 12.5 A |
| Electrical connection | Plug-in | - |
| Recovery (maker figure) | 6.8 gal/hr at 90 °F rise | 7 gal/hr at 90 °F rise |
| Thermostat range | 65 to 161 °F | 90 to 160 °F |
| Price per gallon | $42.50 | $47.31 |
| Installation | ||
| Dimensions (H x W x D) | 14.2 x 14.2 x 12.8 in | 15.8 x 13.8 x 13.8 in |
| Weight | 17.6 lb | - |
| Water connections | 1/2" NPT | 3/4" NPT |
| Relief valve included | Yes | Yes |
| Wall bracket included | Yes | No |
| Warranty | ||
| Tank | 6 years | 6 years |
| Parts | 2 years | 6 years |