Best 100 Gallon Gas Water Heaters

Top 3 Best 100-Gallon Gas Water Heaters (2020 Review)🥇

Last Updated: 21 October 2020

 

In this article, we’re going to be talking about the best 100-gallon gas water heaters that are available on the market.

 

✅Why use a 100-gallon capacity gas water heater?

In this current day, large capacity gas water heaters have gotten far more energy-efficient than then used to be, and because of this, it’s often more preferable to choose a larger unit.

100-Gallon gas hot water heaters can be used for both residential and commercial usage, and provide enough heated water for you and your premises, without overburdening the water heater itself.

We’ve included some top considerations to take into account below, before purchasing a 100-gallon water heater for your home or commercial property.

 

💧Top Considerations Before Purchasing

  • Technical Specs – We’ve done our very best to outline each heater’s technical specs, including UEF (Energy Efficiency), FHR (First Hour Rate), and Recovery Rate, so you have all of this information available when making any comparisons between models.
  • General Specs – We’ve also included information regarding the units physical dimensions and weight
    • Price – Price information has also been specified, with $ representing the lowest price and $$$$$ representing the highest. We realize that everyone has a unique budget, so this is an important consideration
    • Warranty – We’ve displayed warranty information where possible.
  • Customer Reviews/Ratings – We’ve gone about researching only the highest quality 100-gallon gas hot water heaters to include within this article, therefore you can be confident in knowing that any of these units are a great choice.

 

We’ve listed the following 100-gallon water heaters in order of cost, from the lowest price at the top ($) to the largest price ($$$$$) at the bottom:

 

 


100 Gallon Gas Water Heaters – Top 3

  • Rheem G100-200 LP 100 Gal. Propane Universal Commercial Water Heater – $$$$Skip to section
  • AO Smith BT-100 100 Gal. Tank Type Water Heater with Commercial Natural Gas – $$$$$Skip to section
  • Rheem ST120 115 Gal. Commercial Hot Water Storage Tank – $$$Skip to section [Top Recommendation]


Rheem G100-200 LP 100 Gal. Propane Universal Commercial Water Heater – $$$$

Technical Specs

  • UEF (Energy Efficiency): 0.80 EF
  • FHR (First Hour Rating): N/A
  • BTU: 199,900
  • Recovery Rate (at 100): 194GPH

General Specs

  • Price: $$$$
  • Dimensions: 73.8H x 30.25W x 30.25D inches
  • Weight: 780 lbs
  • Warranty: 3-year Warranty

Full technical specs

Features

The Rheem G100-200 LP is a 100-gallon commercial, liquid propane water heater, designed to fit into narrow spaces, and has features and the capability to deliver enough hot water for heavy-duty/commercial needs. This particular model requires a 120-Volt power source.

The tighter the commercial retrofit, the more you will appreciate how Universal’s compact size and multiple water connections simplify installations.

The unit has a thermal efficiency of 80% and a BTU of 199,900. Additionally, it has a maximum temperature setting of 180 degrees Fahrenheit.

The unit has a diagnostic system, with glowing LED lights, verifies system operation sequence by sequence, which is especially helpful to debug any issues.

It has a patented design, with proprietary steel formulation, patented multi-flue design, combined with two coats of porcelain enamel, results in a superior heat exchanger design

Pros
  • Reputable Brand
  • Ideal for Large Commerical Operation
  • 3-Year Warranty on Tank, 1-Year on Parts
Cons
  • Not as energy-efficient or eco-friendly as some electric units

 

 

 


AO Smith BT-100 100 Gal. Tank Type Water Heater with Commercial Natural Gas – $$$$$

Technical Specs

  • UEF (Energy Efficiency): Not disclosed
  • BTU: 75,100
  • Recovery Rate (at 100): 73GPH

General Specs

  • Price: $$$$$
  • Dimensions: 68.6H x 27.75W x 27.75D inches
  • Weight: 350 lbs
  • Warranty: 3-year Warranty on tank, 1-year on parts

Full technical specs

Features

The AO Smith BT-100 is a 100-gallon commercial gas water heater designed for both commercial and residential usage.

It has a glass-lined tank to help maximize tank life, alongside a heavy gauge steel jacket, finished with baked enamel over bonderized undercoat.

The unit has an accurate and dependable control system that requires no electric connections. It also includes a fixed automatic gas shutoff device for added safety.

The BT-100 is insulated with foam to help prevent heat from escaping.

It’s easy to install, given that only gas, water and vent connections need be made. All connections are located in front and top of heaters for ease of installation and service.

Finally it comes with a three-year limited warranty.

Pros
  • Reputable Brand
  • Ideal for Large Commerical Operation
  • 3-Year Warranty on Tank, 1-Year on Parts
Cons
  • Specific Energy efficiency is not disclosed by AO Smith

 

 

 


Rheem ST120 115 Gal. Commercial Hot Water Storage Tank – $$$

Top Recommendation

Technical Specs

  • UEF (Energy Efficiency): Not disclosed
  • PSI: 150 PSI
  • Tank Capacity: 115 Gallons

General Specs

  • Price: $$$
  • Dimensions: 59.25H x 24.9W x 24.9D inches
  • Weight: 300 lbs
  • Warranty: 5-year Warranty on tank

Full technical specs

Features

The Rheem ST120 is a 115 Gallon gas water heater, designed for commercial and larger-scale residential usage.

It’s quite a lot smaller in height when compared to some of the other gas water heaters, even despite the increase in gallon capability.

The tank is created with a unique steel formulation with high-temperature porcelain enamel. This helps to maximize corrosion resistance and results in superior tank design. Heavy-duty magnesium anode rods are installed for longer tank life.

All commercial storage tank models are certified to ASME boiler and pressure vessel code standards.

The unit has a 5-year limited tank warranty against tank leaks.

Pros
  • Reputable Brand
  • Ideal for Large Commerical Operation
  • 5-Year Warranty on Tank
Cons
  • Specific Energy efficiency is not disclosed by Rheem
  • Doesn’t mention a parts warranty

 

 

 


Conclusion

It’s important to highlight that we realize everyone has different needs and requirements for a 100-gallon gas hot water heater, alongside an entirely different budget. Therefore we try not to make solid recommendations, as we don’t know your unique requirements.

However, based on features, reviews, and price, we personally like the Rheem ST120 115 Gal. Given the price, gallon capacity, and positive feedback that it has gained when looking at the Amazon listing.

 

 

 


FAQ

🚰Is a 100 gallon capacity gas hot water heater enough?

The “draw efficiency” of both electric or gas water heaters is generally calculated at approximately 70% of the overall tank storage size.

This is because as a tank is being emptied of hot water, it is also being filled with cold water, so approximately 70% of it is usable hot water.

This means that a 100-gallon unit has a draw efficiency of around 70 gallons.

This is enough to simultaneously maintain six baths running or four baths with two automatic clothes washers running.

 

💧How long does it take a 100 gallon gas water heater to heat up?

There are a few different factors that come into play when talking about this, including the type of heating element inside the tank and the temperature of the water that is entering the unit.

However, hot water heaters will have two ratings that will help you determine the answer to this question, and these are:

First Hour Rating: The total amount of water in gallons that the heater can supply per hour, starting with a full tank of hot water.

Recovery Rate: The total amount of water in gallons that the heater can supply per hour, starting with an empty tank.

 

🚰100-gallon gas water heater cost

These units vary in price, ranging from around $1,500 to $10,000.

As we mentioned at the beginning of the article, we have listed the water heaters in order of cost, from the lowest price at the top ($) to the largest price ($$$$$) at the bottom.

 

Summary
Review Date
Reviewed Item
100-Gallon Gas Water Heaters
Author Rating
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Product Name
100-Gallon Gas Water Heaters

Charlie W. Palmer

Hi! I'm Charlie. If you're wondering why I started WaterSystemsGuide, it's because I previously worked as a water systems specialist/consultant for a large government initiative in California, USA. However, after leaving, I wanted to provide advice and information for others, to pass my knowledge on, so I created this site!

Charlie W. Palmer
Hi! I'm Charlie. If you're wondering why I started WaterSystemsGuide, it's because I previously worked as a water systems specialist/consultant for a large government initiative in California, USA. However, after leaving, I wanted to provide advice and information for others, to pass my knowledge on, so I created this site!
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