Effex® High Efficiency 50-Gallon Gas Water Heater

Effex® High Efficiency 50-Gallon Gas Water Heater

Model GAHH-50

Effex High Efficiency Gas Tank Water Heater GAHH-50 is rated 4.3333 out of 5 by 6.
Rated 3 out of 5 by from not sure about the capacity of the GAHH-50 I previously had a 75 gallon heater for about 14 years. With only 3 people in the house I thought I could cut the tank size and save on gas by downsizing with a smaller but more efficient unit. I'm concerned this was not such a good idea. I've had to turn the temp. up to 130 degrees just so my wife can have enough hot water to fill her Jacuzzi.
Date published: 2015-02-01
Rated 5 out of 5 by from Efficiency at its best I was in a battle with my plumber over this heater, he found it unnecessary and wanted to use a standard heater. well I won that battle this heater is incredible. when I call for hot water its there in tons, when I'm not calling for hot water I never hear run, so its temperature drop is close to none.
Date published: 2014-12-21
Rated 5 out of 5 by from Great tank!! Very efficient, lots of 120 degree water with this 50 gallon model. We can now fill our Jacuzzi bathtub and enjoy it.
Date published: 2014-09-06
Rated 5 out of 5 by from Replacement AO Smith water heater Ordered this item because old AO Smith heater finally at end of life (21 years). Installed this new unit myself, I do plumbing for work so it was relatively easy process. So far it's only been 2 weeks but the unit is working great. Ask me in 12 months and I'm hoping for nothing but a great experience!I just knew I made the right choice by purchasing an AO Smith natural gas water heater! A superior product based on info and reviews I've read and discussed with other plumbing companies.
Date published: 2014-08-14
Rated 5 out of 5 by from Great So Far I bought an AO Smith because when i bought my house there was an AO Smith here and it was 16yrs old! So i chose the Effex 50 gal model and it is awesome. I love the digital controls and no standing pilot. I had hot water an hr after install! If you have an AO Smith it will probably fit in exact spot with exact plumbing, mine sure did although i took this chance to update the plumbing of course.Som talk about the fan being loud but i gotta say it sounds like a hairdryer on really low setting, not loud at all. If you had it in a closet you would not notice.
Date published: 2014-03-04
Rated 3 out of 5 by from So far so good, but... I've only just installed this, and am looking forward to the improved efficiency, However, (a) I was surprised at how noisy the blower was, (b) I was surprised at the amount of exposed hardware around the burner controls, and (c) the exhaust hood seemed a bit flimsy... my installer kind of mangled it (I not fully satisfied there either...).
Date published: 2013-12-24
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The Effex® High Efficiency atmospheric gas water heater is an ideal choice for replacement application, delivering the highest efficiency ratings among standard gas models and helping you save as much as 25% on water heating costs.

Featuring a 50-gallon tank and a 40,000 BTU gas burner, the GAHH-50 standard vent delivers a first hour rating of 81 gallons and a recovery rate of 43 gallons per hour. With an 0.70 Energy Factor, this water heater is ENERGY STAR® qualified. It carries a 6-year limited warranty, and meets Low NOx emission requirements.

Where to Buy

Where to Buy

Woodbridge, NJ 07095

Location #1

AGs Plumbing & Heating Corp.

Elizabeth, NJ

More Info >>
Location #2

Tuga Plumbing

Union, NJ

More Info >>
Location #3

Authorized Heating

Brooklyn, NY

More Info >>
View All List My Company Here

Product Features & Options

Electronic Gas Control

Intelligent control logic provides enhanced operating parameters and tighter differentials for precise sensing and faster heating response to optimize performance.

Powered Anode Rod

Powered anodes are non-sacrificial, so they do not deplete over time. Additionally, they provide exceptional performance in all water conditions.

Brass Drain Valve

Our brass drain valve is more durable and tamper-resistant than an ordinary plastic drain valve, which contributes to improved safety and reliability.

DynaClean™ Diffuser Dip Tube

Thanks to the improved technology, the inlet tube features water jets that redirect incoming cold water into the tank, creating turbulence, which helps reduce lime build-up, therefore maintaining heater efficiency.

How it Works

The high efficiency performance of the Effex® model is possible thanks to its patented air intake system. Air is pushed into the combustion chamber creating a pressurized environment. Due to this “turbo charge” effect, tighter baffling is incorporated in the flue design to slow down the hot gas as it travels through the water heater. This results in more heat transferred to the water and less energy wasted.




limited warranty


energy factor

CSA International Low Lead Content Certification in compliance with U.S. and Canadian safety standards on gas components
ASME American Society of Mechanical Engineers
The Blue Diamond formula is enriched with a high level of zircon, producing a coating that is harder and more water-resistant than any other in the industry

Product Specifications

Tech Specs
Gallon Capacity: 50
Recovery Gallons: 43
Maximum BTUs: 40,000
Power Source: Natural Gas
Energy Factor: 0.70
Limited Tank Warranty: 6 Years
Limited Parts Warranty: 6 Years
Anode: Powered Anode
T&P Relief Valve: Yes
Ignition Type: Electronic
Water Connection Location: Side
Water Connection Size: 3/4"
Emissions: Low NOx
FVIR Certified: Yes
Digital Display: Yes
First Hour Rating: 81
Dimensions & Venting
Type: Tall
Height: 60 5/8"
Height w/Draft Hood: 60 5/8"
Diameter: 22"
Width: 22"
Depth: 22"
Shipping Weight: 171lbs/77kg
Vent Type: Standard Vent


Rebate and incentive programs provide cash-back to consumers for the purchase of appliances that meet certain energy efficiency standards. Often, these standards are tied to the ENERGY STAR® program.

Cash for Appliances is designed to encourage the purchase of energy efficient appliances. Consumers who purchase ENERGY STAR® or CEE qualified appliances can receive cash rebates. Most states are offering rebates in the $50 to $250 range.


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Need More Hot Water?

There's no reason to run out of hot water. If you're not sure that the GAHH-50 provides enough hot water for your needs, consider these:


Effex® High Efficiency 40-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 40,000 BTU

Effex® High Efficiency 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 40,000 BTU

Vertex™ 100 Power Direct Vent 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 100,000 BTU

Vertex™ Power Vent 50-Gallon Gas Water Heater

  • 6 Year Limited Warranty
  • 76,000 BTU