Ariston Andris RS 8 Gallon
An 8 gallon tank for a kitchen or utility sink at a low price, with a six-year tank warranty. Plan on hardwiring it.
Amazon $209.99$209.99
The Ariston Andris RS 8 Gallon is the better mini tank water heater overall, rated 3.4 to 2.6. The Ariston Andris RS 8 Gallon leads on value and tank size. The ThermoMate ES700 6.5 Gallon wins on features. The Ariston Andris RS 8 Gallon costs $30 less ($209.99 vs $239.99).
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.
ThermoMate ES700 6.5 Gallon
A 6.5 gallon plug-in tank with a freeze setting for cabins and garages. GE sells a 6 gallon tank with a much longer warranty for about the same price.
Amazon $239.99$239.99
Which should you buy?
- Choose the Ariston Andris RS 8 Gallon for value ($26.25 per gallon ($209.99, 8 gal) vs $36.92 per gallon ($239.99, 6.5 gal)) and tank size (8 gal tank vs 6.5 gal tank).
- Choose the ThermoMate ES700 6.5 Gallon for features (plugs into an outlet, relief valve included vs relief valve included, wall bracket included).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 6 to 10 gallon mini tank water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Ariston Andris RS 8 Gallon | ThermoMate ES700 6.5 Gallon |
|---|---|---|
| Overall rating | 3.4/5 | 2.6/5 |
| Value 30% | 70 $26.25 per gallon ($209.99, 8 gal) | 33 $36.92 per gallon ($239.99, 6.5 gal) |
| Warranty 30% | 56 6-year tank, 2-year parts | 17 3-year tank, parts warranty not published |
| Heating power 15% | 20 1,440 W element | 20 1,440 W element |
| Features 15% | 60 relief valve included, wall bracket included | 75 plugs into an outlet, relief valve included |
| Tank size 10% | 50 8 gal tank | 12 6.5 gal tank |
Specifications
| Ariston Andris RS 8 Gallon | ThermoMate ES700 6.5 Gallon | |
|---|---|---|
| Heating | ||
| Tank capacity | 8 gal | 6.5 gal |
| Element | 1,440 W | 1,440 W |
| Voltage | 120 V | 120 V |
| Current | 12 A | 12 A |
| Electrical connection | Hardwired | Plug-in |
| Recovery (maker figure) | 6.8 gal/hr at 90 °F rise | - |
| Thermostat range | 65 to 167 °F | 50 to 149 °F |
| Price per gallon | $26.25 | $36.92 |
| Installation | ||
| Dimensions (H x W x D) | 17.5 x 17.5 x 15.2 in | 17.7 x 17.7 x 14.6 in |
| Weight | 29.5 lb | 26.5 lb |
| Water connections | 3/4" NPT (adaptor included) | 1/2" NPT |
| Relief valve included | Yes | Yes |
| Wall bracket included | Yes | - |
| Warranty | ||
| Tank | 6 years | 3 years |
| Parts | 2 years | - |