Ariston POU 20 Gallon
A 20 gallon, 120 V tank that fits under a counter, for a small apartment, cabin or in-law suite, with six years on parts and tank.
Amazon $351.50$351.50
The Ariston POU 20 Gallon is the better mini tank water heater overall, rated 3.7 to 3.0. The Ariston POU 20 Gallon leads on tank size. The VEVOR 18 Gallon Tank Water Heater wins on value and heating power. The VEVOR 18 Gallon Tank Water Heater costs $131.60 less ($219.90 vs $351.50).
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.
VEVOR 18 Gallon Tank Water Heater
A cheap 18 gallon tank for a shop, barn or utility room. With no published warranty, the GE 18 gallon is the safer buy for a home.
Amazon $219.90$219.90
Which should you buy?
- Choose the Ariston POU 20 Gallon for tank size (20 gal tank vs 18 gal tank).
- Choose the VEVOR 18 Gallon Tank Water Heater for value ($12.22 per gallon ($219.90, 18 gal) vs $17.57 per gallon ($351.50, 20 gal)) and heating power (1,600 W element vs 1,500 W element).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every 12 to 20 gallon mini tank water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Ariston POU 20 Gallon | VEVOR 18 Gallon Tank Water Heater |
|---|---|---|
| Overall rating | 3.7/5 | 3.0/5 |
| Value 30% | 58 $17.57 per gallon ($351.50, 20 gal) | 98 $12.22 per gallon ($219.90, 18 gal) |
| Warranty 30% | 83 6-year tank, 6-year parts | 0 warranty not published, scored as none |
| Heating power 15% | 29 1,500 W element | 43 1,600 W element |
| Features 15% | 35 relief valve included | 0 features not published, scored as none |
| Tank size 10% | 100 20 gal tank | 75 18 gal tank |
Specifications
| Ariston POU 20 Gallon | VEVOR 18 Gallon Tank Water Heater | |
|---|---|---|
| Heating | ||
| Tank capacity | 20 gal | 18 gal |
| Element | 1,500 W | 1,600 W |
| Voltage | 120 V | 120 V |
| Current | 12.5 A | - |
| Recovery (maker figure) | 7 gal/hr at 90 °F rise | - |
| Thermostat range | 90 to 160 °F | 86 to 167 °F |
| Price per gallon | $17.57 | $12.22 |
| Installation | ||
| Dimensions (H x W x D) | 25.5 x 18.2 x 18.2 in | 30.7 x 16.1 x 16.1 in |
| Weight | - | 53 lb |
| Water connections | 3/4" NPT | - |
| Relief valve included | Yes | - |
| Wall bracket included | No | - |
| Warranty | ||
| Tank | 6 years | - |
| Parts | 6 years | - |