Ariston PV50SLN*-65*

It holds 47 gallons in the test, 3 gallons less than its 50-gallon sold size. Over one hour from a full tank, it gave 110 gallons in the test (its first-hour rating). That is 63 gallons more than its tank holds, since it reheats during the hour. Of 763 gas storage models, 71 give more hot water in the first hour. The median gas storage model gives 78 gallons in the first hour of the test.

It was not listed as ENERGY STAR certified on Oct 26, 2026. In tests, 69% of the energy went to hot water, so its UEF is 0.69. In the test, daily hot water use was set to high (its draw pattern). Of 434 gas storage models with the same draw pattern, 151 have a higher UEF. A UEF of 0.66 is the median for its type and draw pattern. When it reheats water in the test, 82% of the energy it uses ends up in the water.

Its test figures match those of one other basic model. That one carries the AMERICAN STANDARD WATER HEATERS brand name. You can find the whole group on the page for the AMERICAN STANDARD WATER HEATERS PV50SLN*-65*.

It may qualify for 2 rebate programs.