AO Smith Promax 30 Gallon Review


If you want to enjoy the luxury of a good hot bath, the AO Smith Promax 30 Gallon electric water heater is one of the most reliable in the market today. Having choices of varied shower time, you can enjoy a hot bath from 4 up to 30 minutes depending on the duration of your choice:

AO Smith Promax 30 Gallon features

Benefits and Pros of the AO Smith Promax

  • Shorter shower time of 4 to 6 minutes (if you are in a hurry).
  • Longer shower time of 10 to 20 minutes (enough to clean and relax you the whole day).
  • Luxurious shower time 20 to 30 minutes (to enjoy the full benefit of hot/therapeutic shower).
  • Price $640 from Amazon

To enjoy these benefits, the Smith 30 Gallon Pro Max electric water heater is equipped with the following features and options;

AO Smith Promax 30 Gallon features

  • 30 gallon tank.
  • Delivery of 40 gallons at energy factor of 0.93
  • Coregard aluminum anode (corrosion protection)
  • 6 years limited warranty

Not to be left behind is the AO Smith Promax 30 Gallon gas water heater which functions almost the same, but with a little difference in some features we have listed them below so you can compare the difference.

  • 35,000 BTU gas burners
  • 35,000 BTU gas burners
  • 67 gallons per hour delivery
  • Standard vents XVR-3
  • Energy factor of 0.62
  • Electronic gas control
  • Brass drain valve
  • 10 years limited warranty

AO Smith Promax 30 Gallon specs

Negatives of the AO Smith

Below I have also listed the major disappointments of this water heater I have based this on the most common reasons why someone would return the heater or make a formal complaint against them on their site or on amazon shopping site.

AO Smith Promax 30 Gallon

How the AO Smith Promax 30 Gallon Works

Cold water enters the internal “dip tube’ of the water heater; this forces the cold water to the bottom of the connection, then pushes hot water through the outlet. In providing most of the hot water for a given size of the tank, the typical residential water heater is equipped with two thermostats the bottom thermostat controls the lower heating elements and the top thermostat controls the upper heating element.

Only one element in the AO Smith Promax is active at a time, as the lower element sees the cold water first and it does most of the work. The upper heating element is used when the entire water in the tank is cold. Glass line is installed inside the tank to prevent water from corroding the steel tank. When the internal pressure of the tank exceeds its limits, a temperature and pressure relief safety device is triggered to open it, avoiding any damages.

Even for the larger households with a bigger demand for hot water, the 30 Gallon ProMax electric or gas water heater can provide enough hot water even during cold temperatures.

AO Smith Promax 30 Gallon Disassembly and Repair Help Video

Other AO Smith Promax water heater models

  • AO Smith Pro Max 50 Gallon
  • AO Smith 40 Gallon Water Heater
  • Full range of AO Smith Promax


Do I recommend the 30 gallon gas water heater? Currently on the market many people are experiencing some problems so this puts this water heater at a risk to purchase. It’s not a cheap heater and the damage that it can cause is not worth the risk to your home.

Owning either the AO Smith Promax electric or gas water heater is a matter of preference on what may be more convenient to you and your needs.

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