AO Smith 75 Gallon Water Heater Reviews: 4 Great Choices

Big families, big houses, and home spas all need this big AO Smith 75 gallon water heater.

Never again worry about running out of hot water. Even with multiple showers and the dishwasher running at the same time.

Need to fill the Jacuzzi? No problem! Just pick the best one for you out of the four choices.

A.O.Smith 75 gallon water heater. AllWaterProducts.com

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AO Smith 75 Gallon Water Heater Introduction

A.O. Smith has been inventing innovative water heater products for millions of business owners, consumers, engineers and property managers globally. More than 80 years of success means you can rely on their water heaters.

AO Smith’s wide range of commercial and residential storage tanks, boilers and water heaters is unrivaled for diversity and quality, and are sold exclusively via plumbing contractors and plumbing wholesalers.

A.O. Smith provides energy-efficient solutions with maximum value anywhere hot water is required and it will last for many years after installation.

A.O. Smith supports its customers and products with excellent service, by merging competent people who take pride and strive to be the very best with advanced technology.    

AO Smith 75 Gallon Water Heater PCG75 (Natural Gas)

The model PCG75 ProMax High Recovery Residential Water Heater has a capacity of 74 gallons and is 61″ high. It is powered by natural gas and has a 10 year warranty.

The A.O. Smith 75 gallon water heaters in the ProMax series are high recovery residential gas water heaters, making them ideally suitable high-demand applications and big families.

Features

  • The patented Green Choice gas burner is Eco-Friendly and has been designed to reduce NOx emissions by as much as 33%. This complies with the requirements for NOx emissions to be less than 40 ng/j.
  • The exclusive Dynaclean diffuser dip tube maximizes hot water output by helping to reduce sediment and lime buildup. As it is manufactured from PEX cross-linked polymer, it is extremely long lasting.
A.O.Smith 75 Gallon Water Heater PCG75 AllWaterProducts.com

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  • Lighting the pilot light is easy and fast, and is achieved via a push-button piezo ignitor providing push-button spark ignition with one hand.
  • The Coregard magnesium anode provides superior tank corrosion protection.
  • Efficiency is improved via thick CFC-free foam insulation.
  • The brass drain valve is damage-resistant and durable.
  • The top-mounted temperature and pressure relief valve is ASME rated and CSA certified.
  • The steel tank is protected from rust with a Permaglas glass coating.

Specifications

  • Intended Household: More than 5 People
  • Fuel Type: Natural Gas
  • Capacity: 74 Gallons
  • BTU Input: 75,100
  • Diameter: 26.5″
  • Height: 61″
  • Weight: 275 lbs.
  • Vent Size: 4″
  • Water Connection: 1″
  • Gas Connection: 0.5″
  • Recovery 90°F Rise: 81 GPH
  • R-Value: 16
  • Warranty: 6 year Limited Parts / 10 year Limited Tank

Customer Reviews

Many of the customer reviews available speak more to the services of the plumbing contractors or plumbing wholesaler the unit was bought from rather than the actual product itself.

The fact that these reviews are all very positive however speaks to the fact that A.O. Smith will only sell these products through reputable resellers with the same commitment to quality and service as they do.

Ease of purchase, excellent shipping options and problem free installations are common themes of the reviews.

There are a few reviews that mention problems with the units delivered but it is interesting to note that all of those problems were resolved speedily without any problems and to the customer’s satisfaction.

Another noteworthy point is that there seems to be a fairly big price difference between various suppliers. It will therefore be well worth your while to compare prices and special deals between suppliers.

Customers report that the A.O. Smith 75 gallon water heater is suitable for use in apartment buildings, as well as homes with 3 1/2 baths, some of which include a jetted tub, and 5 or 6 people living there.

The majority of customers buy this water heater as a replacement for a previous A.O. Smith water heater that lasted anything between 12 and 20 years.

Another common trend in the reviews is that these water heaters heat the water much faster and to a higher temperature than their predecessors do. Customers report that they quickly have to set the heaters to the ‘A’ setting – the lowest temperature and therefore also the most economical.

A number of reviews mention that the inlet water connection uses a ‘nonstandard’ 1” fitting, so a typical 0.75” adapter is required. One customer’s recommendation is to use dielectric unions during installation to prevent corrosion issues at outlet and inlet stubs.

FAQ

What is the maximum altitude at which the A.O. Smith 75 gallon water heater can be installed?

This water heater is approved for use at 7,700 ft. above sea level.

Does this heater use 110 V or 220 V?

This heater uses natural gas as an energy source and not electricity.  As it has an atmospheric (chimney) vent, it also does not require electricity for venting.

What type of vent does this heater use?

This heater uses a standard chimney atmospheric vent, i.e. not a power vent.

What is the energy factor rating and is it eligible for energy tax rebates?

As this unit’s is BTU input is greater than 75,000 it is not Energy Star-rated and therefore does not qualify for energy tax rebates.

What is the unit’s recovery time?

The recovery time is 81 gallons per hour at a raise of 90°F.

AO Smith 75 Gallon Water Heater FCG75, Natural Gas

This 300 series ProMax plus high recovery residential gas water heater is 61″ high and features a 74 gallon capacity as well as a 75,100 BTU input.

It is compliant with the requirements of releasing less than 40 ng/j for NOx emissions by virtue of its patented green choice gas burner that reduces NOx emissions by as much as 33%.

Features

  • The Dynaclean diffuser dip tube, manufactured from PEX cross-linked polymer that helps it last longer and helps maximize hot water output by reducing buildup of sediment and lime.
A.O. Smith ProMax Plus 75 Gallon Natural Gas Water Heater FCG75 AllWaterProducts.com

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  • The combination of input and capacity up to 75,100 BTUs and 98 gallons allows deliverable hot water of up to 150 gallons and a recovery of up to 81 gallons per hour.
  • The exclusive Coregard anode rod from A. O. Smith is made from aluminum anode with a stainless steel core. Resulting in longer tank protection against corrosion when compared to ordinary anodes.
  • The tamper-resistant drain valve is manufactured from brass making it extremely durable.
  • The push-button piezo ignitor means the lighting pilot with one-hand is fast and easy.
  • Improved efficiency due to thick, non-cfc foam insulation that is environmentally-friendly.
  • Top-mounted temperature and pressure relief valve is ASME rated and CSA certified and optionally available on FVIR compliant models.
  • 6-year limited parts and tank and warranty

Specifications

  • Fuel Type: Natural Gas
  • Capacity: 74 gallons
  • Diameter: 26.5″
  • Height: 61”
  • BTU Input: 75,100
  • Recovery:  81 gallons per hour at 90°F temperature rise
  • R Value: 16
  • Weight: 290.00 lbs.

Customer Reviews

One does not often find negative reviews for A.O. Smith water heaters. There was however one for this model where the customer complains about the unit being very noisy and requiring a few repairs during its 5 years of life. The customer also states that this model was used in their community and many had been replaced.

Other reviews mention replacing A.O. Smith water heater after between 6 and 37 years.

Installation is simple and tends to go smoothly. There are some comments about the inlet water connection being 1” rather than the standard ¾” found in most houses. This is however easily solved by using adaptors.

The biggest challenges with installation is the physical size and weight of the unit that make it tricky to maneuver into position for installation. Need help installing a water heater? Click Here

Customers also report that this heater supplies enough hot water for high demand applications. Such as filling a 120 gallon tub, producing enough hot water for a Jacuzzi tub, washing machine, and shower to be used at the same time. Or filling a jetted tub, running the dish washer and washing machine at the same time.

FAQ

Can the unit be used with LP gas?

No, this unit uses natural gas. There are however other models designed specifically for LP gas.

What is C3 Technology? Is it the same as FVIR?

Some AO Smith products use “Corderite Combustion Containment,” also known as C3 Technology. It is a patented system that accomplishes the same results as any other FVIR system. A.O. Smith would claim that their system is better than other FVIR systems.

Both C3 Technology and other FVIR technology uses a flame arrestor component and a sealed combustion chamber. Which is a safety feature that prevents potential gas explosions.

FVIR refers to “Flammable Vapor Ignition Resistant”. It is designed to prevent flammable gases that are outside of the water heater from causing an explosion. This was mandated to be installed on all gas water heaters in 2003.

That’s because there had been explosions caused by homeowners having spilled gasoline near the water heater. The fumes from the gasoline were able to reach the water heater which caused the fumes to explode.

So, C3 Technology does the same thing as FVIR, but in a slightly different way and in a (possibly) better way.

What does BTU mean?

One BTU is how much heat is needed to increase the temperature of one pound of water by one degree Fahrenheit. More BTUs equates to more heating power.

Is the FCG-75 rated for high altitude?

This water heater is rated for up to 7700 feet. If you use it at a higher altitude, it will not achieve the highest efficiency rating with thinner air, but will work fine.

What is FHR?

FHR stands for First Hour Rating. Water heaters with BTU ratings of more than 75,000 do not have an FHR or energy factors assigned.

What is the difference between the 6 year warranty for the FCG-75 and the 10 year warranty for the PCG-75?

One pessimistic answer to this question states that there is no difference between these units. That the extra expense of the PCG-75 is to cover the cost of the longer warranty. I have to disagree with that customer.

Longer warranties are given to water heaters that have thicker glass coatings that will make the tank last longer. Typically, longer warranties also include longer lasting anode rods, and brass parts instead of plastic parts.

Another answer however points out that the PCG-75 has a magnesium anode that will last longer than the FCG-75’s aluminum anode.

What is the efficiency rating for the FCG-75?

Due to the high BTU input rating, the FCG-75 does not have a thermal efficiency rating or energy factor.

The 75 gallon models are typically 80%.

At what temperatures are the A, B, and C temperature setting set?

  • A = 130°F
  • B = 140°F
  • C = 150°F

AO Smith 75 Gallon Water Heater GPVX-75L-LP, 72,000 BTU, Power Vented, Liquid Propane

The ProMax water heaters use power vents and have been designed with greater energy factors (EF) to maximize efficiency.

Features

  • Energy Star Rated
  • Meets the Energy Star EF requirement from September 2010 and may qualify for local rebate and utility programs.
  • More reliable and robust than a standing pilot, the hot-surface ignitor also reduces energy consumption.
  • Sediment accumulation on the bottom of the tank is reduced by the self-cleaning action of the Dynaclean II dip tube. It also optimizes the inlet water pressure to reduce cold water regions in the tank.
A.O. Smith 75 Gallon Power Vented Liquid Propane Water Heater GPVX-75-LP AllWaterProducts.com

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  • Overall energy efficiency is increased and the amount of heat loss reduced by 2” thick foam insulation that is environmentally friendly.
  • Heat lost through piping is reduced via built-in heat traps on the water outlet and inlet.
  • Flexibility is added via the unique 3-position rotatable fan blower outlet.
  • Protected sensors detect the presence of flammable vapors and disables the burner automatically to prevent explosions.
  • Combined vertical and horizontal vent runs up to 180 ft. with 4″ diameter (PVC, ABS, polypropylene and CPVC.)
  • Reduced NOx emissions comply with California South Coast AQMD regulations for air quality management.
  • For safety, flammable vapors outside of the water heater are prevented from entering the sealed combustion chamber by an air intake snorkel elevating the inlet location of combustion air.
  • LED control lights provide easy access to diagnostics information and operation status.
  • Precise temperature control is provided by state-of-the-art electronic gas control.
  • Temperature and Pressure relief valve and a damage-resistant, durable brass drain valve are positioned for easy access when servicing.
  • Side Connections
  • 6 year limited parts and tank warranty.

Specifications

  • Width: 26″
  • Height: 70.625″
  • Weight: 300 lbs.
  • Fuel Type: Liquid Propane
  • Capacity: 75 Gallons
  • Flowrate: 1-3 Gallons Per Minute
  • Energy Star: Yes
  • Usage Residential for Households of 5+ people
  • BTU Input: 72,000
  • Vent Type Power
  • Vent Size: 3″ & 4″
  • Water Connection: 3/4″
  • Gas Connection: 1/2″
  • Energy Factor: 0.68
  • 1st Hour Delivery: 155 Gallons
  • Recovery: 80.4 GPH @ 90°F Rise

Customer Reviews

There are only 3 customer reviews available for this model and they are all positive, without really providing much detail.

AO Smith 75 Gallon Water Heater GPVX-75L, 72,000 BTU, Power Vented, Natural Gas

This model is virtually identical to the previous one reviewed, with the only difference being that this one uses natural gas rather than Liquid Propane. All other specifications and the customer reviews are identical.

The ProMax water heaters use power vents and have been designed with greater energy factors (EF) to maximize efficiency.

Features

  • Energy Star Rated
  • Meets the Energy Star EF requirement from September 2010 and may qualify for local rebate and utility programs.
  • More reliable and robust than an old style standing pilot, the hot-surface igniter also reduces energy consumption.
A.O. Smith 75 Gallon Power Vented Natural Gas Water Heater GPVX-75L AllWaterProducts.com

Fill up that Jacuzzi and jump in. Click Here

  • Sediment accumulation on the bottom of the tank is reduced by the self-cleaning action of the Dynaclean II dip tube. It also optimizes the inlet water pressure to reduce cold water regions in the tank.
  • Overall energy efficiency is increased and the amount of heat loss reduced by 2” thick foam insulation that is environmentally friendly.
  • Heat lost through piping is reduced via built-in heat traps on the water outlet and inlet.
  • Flexibility is added via the exclusive (to A.O. Smith) 3-position adjustable blower outlet.
  • Protected sensors detect the presence of flammable vapors and disables the burner automatically to prevent fires outside of the water heater.
  • Combined vertical and horizontal vent runs up to 180 ft. with 4″ diameter (PVC, ABS, polypropylene and CPVC.)
  • Reduced NOx emissions comply with California South Coast AQMD regulations for air quality management.
  • Flammable vapors from outside of the water heater are prevented from entering the sealed combustion chamber by an air intake snorkel. The snorkel raises the inlet location of the combustion air as a safety feature.
  • LED control lights provide easy access to diagnostics information and operation status.
  • Precise temperature control is provided by state-of-the-art electronic gas control.
  • Temperature and Pressure relief valve and a (threads) damage resistant, durable brass drain valve are positioned for easy access when servicing.
  • Side Connections
  • 6 year limited parts and tank warranty.

Specifications

  • Width: 26″
  • Height: 70.625″
  • Weight: 300 lbs.
  • Fuel Type: Natural gas
  • Capacity: 75 Gallons
  • Flowrate: 1-3 Gallons Per Minute
  • Energy Star: Yes
  • Usage Residential for Households of 5+ people
  • BTU Input: 72,000
  • Vent Type Power
  • Vent Size: 3″ & 4″
  • Water Connection: 3/4″
  • Gas Connection: 1/2″
  • Energy Factor: 0.68
  • 1st Hour Delivery: 155 Gallons
  • Recovery: 80.4 GPH @ 90°F Rise

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AO Smith 75 Gallon Water Heater Reviews: 4 Great Choices
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AO Smith 75 Gallon Water Heater Reviews: 4 Great Choices
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Use the Jacuzzi tub, washing machine, and shower all at the same time with an A.O. Smith 75 gallon water heater. Family of 6? No problem!
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All Water Products
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