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
The Ariston POU 6 Gallon is the better mini tank water heater overall, rated 2.8 to 2.6. The Ariston POU 6 Gallon leads on heating power. The ThermoMate ES700 6.5 Gallon wins on value, features and tank size. The ThermoMate ES700 6.5 Gallon costs $43.88 less ($239.99 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.
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 POU 6 Gallon for heating power (1,500 W element vs 1,440 W element).
- Choose the ThermoMate ES700 6.5 Gallon for value ($36.92 per gallon ($239.99, 6.5 gal) vs $47.31 per gallon ($283.87, 6 gal)), features (plugs into an outlet, relief valve included vs relief valve included) and tank size (6.5 gal tank vs 6 gal tank).
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 POU 6 Gallon | ThermoMate ES700 6.5 Gallon |
|---|---|---|
| Overall rating | 2.8/5 | 2.6/5 |
| Value 30% | 6 $47.31 per gallon ($283.87, 6 gal) | 33 $36.92 per gallon ($239.99, 6.5 gal) |
| Warranty 30% | 83 6-year tank, 6-year parts | 17 3-year tank, parts warranty not published |
| Heating power 15% | 29 1,500 W element | 20 1,440 W element |
| Features 15% | 35 relief valve included | 75 plugs into an outlet, relief valve included |
| Tank size 10% | 0 6 gal tank | 12 6.5 gal tank |
Specifications
| Ariston POU 6 Gallon | ThermoMate ES700 6.5 Gallon | |
|---|---|---|
| Heating | ||
| Tank capacity | 6 gal | 6.5 gal |
| Element | 1,500 W | 1,440 W |
| Voltage | 120 V | 120 V |
| Current | 12.5 A | 12 A |
| Electrical connection | - | Plug-in |
| Recovery (maker figure) | 7 gal/hr at 90 °F rise | - |
| Thermostat range | 90 to 160 °F | 50 to 149 °F |
| Price per gallon | $47.31 | $36.92 |
| Installation | ||
| Dimensions (H x W x D) | 15.8 x 13.8 x 13.8 in | 17.7 x 17.7 x 14.6 in |
| Weight | - | 26.5 lb |
| Water connections | 3/4" NPT | 1/2" NPT |
| Relief valve included | Yes | Yes |
| Wall bracket included | No | - |
| Warranty | ||
| Tank | 6 years | 3 years |
| Parts | 6 years | - |