Electric Low Capacity

Light Duty Commercial

Electric cement lined water heater Model E
  • Light Duty
  • 6 - 120 Gallon Capacity
  • Up to 12KW - 1 Phase or 3 Phase

Ceiling Hung Horizontal

Electric horizontal ceiling hung water heater Model HE/HSE
  • Horizontal, Ceiling Hung
  • 20 or 30 Gallon Capacity
  • Up to 20 KW - 1 or 3 Phase

Heat Pump
Hybrid

Hybrid electric heat pump water heater Model PBX
  • Heat Pump Water Heater
  • 40 - 120 Gallon Capacity
  • 1 or 3 Phase

Point-Of-Use Storage

Point-of-use electric water heater Model CE110
  • Point-of-Use
  • 1 Gallon Capacity
  • 1000 or 450 Watts - 1 Phase

Point-Of-Use Tankless

Electric tankless point-of-use water heater Model R
  • Whole House / Point-of-Use
  • Availabe 3 thru 27 KW - 1 Phase

Electric
Booster

Electric booster water heater Model J
  • Booster Heater
  • Provides 180°F water
  • Up to 88 KW - 1 or 3 Phase

Tankless Electric Booster

Electric tankless booster heater Model JTX
  • Tankless Booster Heater
  • Provides 180°F water
  • 11 to 54 KW - 1 or 3 Phase

Heavy Duty Commercial

Commercial heavy duty electric storage water heater Model SE
  • Heavy Duty
  • 6-120 Gallon Capacity
  • Up to 58 KW - 3 Phase

Tankless Commercial

Electric tankless water heater Model TX
  • Tankless Commercial
  • Highly efficient tankless
  • Up to 54 KW - 1 or 3 Phase

Large ASME
Heater

Large capacity electric storage tank water heater Model SH
  • Large Capacity
  • 80-5000 Gallon Capacity
  • All KW ratings - 1 or 3 Phase
     

Commercial Gas Tankless

Gas tankless water heater Model GX
  • High Efficiency Condensing Burner
  • Integrated Pump
  • 200,000 and 250,000 BTUs

Integrated Tank with Tankless

Condensing gas storage tank water heater Model GXT
  • High Efficiency Condensing Burner
  • Hydrastone Cement
  • 200,000 to 250,000 BTUs

DI / RO Gas
Tankless

DI/RO gas fired tankless water heater Model DGX
  • DI/RO Water Heater
  • High Efficiency Condensing Burner
  • 199,950 and 250,000 BTU

Gas Tankless Booster

Condensing gas tankless booster water heater Model JBX
  • Gas Tankless Booster
  • For Commercial Kitchens
  • 250,000 BTU

Gas Storage
Heater

Condensing gas storage tank water heater Model GXT
  • Non Condensing Burner
  • Hydrastone Cement
  • 200,000 to 250,000 BTUs
   

Large ASME
Steam Heater

Steam fired water heater large capacity Model ST
  • Storage Type
  • 80-5000 Gallon Capacity
  • ASME Stamped

Packaged Semi-Instantaneous

Semi-Instantaneous Steam Fired Water Heater Model STX
  • Semi-Instantaneous
  • Space saving design
  • Provides 10,500 GPH

Point-Of-Use
Steam

Storage tank steam fired water heater Model PS
  • Light Duty
  • 80-120 Gallon Capacity
  • For low demand/recovery

High Capacity Instantaneous

Instantaneous steam fired water heater Model F
  • Instantaneous
  • 7 Sq. Ft. of floorspace
  • Up to 120 GPM
     

Semi-Instantaneous Indirect

Indirect fired semi-instantaneous water heater Hubbell Model BWX
  • Semi-Instantaneous
  • Vertical or Horizontal
  • ASME Stamped

Large ASME
Indirect

Indirect fired storage tank water heater Hubbell Model BW
  • Storage Type
  • Vertical or Horizontal
  • 80-5000 Gallon Capacity

Small Capacity Indirect

Indirect fired storage tank water heater model T Transflow
  • Indirect Fired
  • 30-120 Gallon Capacity
  • Utilizes boiler water

Solar

Solar water heater Model SLN
  • Solar Heater
  • Vertical Storage Type
  • 30-120 Gallon Capacity
       

Storage
Tanks

ASME and None ASME storage vessels Hubbell Model StorageTank
  • ASME & Non ASME designs
  • Hydrastone Cement
  • Vertical or Horizontal

Buffer
Tanks

ASME and None ASME storage vessels Hubbell Model BufferTank
  • Carbon Steel Construction
  • Long Warranty
  • ASME Section VIII, Division 1
   
       

Circulation (Instantaneous)

Electric circulation heater Hubbell Model CR
  • Circulation (Instantaneous)
  • Heavy Duty Construction
  • 25-1600 KW - 1 or 3 Phase

Explosion
Resistant

Electric hazardous location water heater Model ER
  • Hazardous Location
  • 10-120 Gallon Capacity
  • Up to 58 KW - 1 or 3 Phase

Industrial Process Heater

Electric process industrial water heater Model V
  • Process Systems & Industrial
  • ASME Stamped
  • Up to 88 KW - 1 or 3 Phase

Emergency Shower Tankless

Electric tankless safety shower water heater Model ETX
  • Tankless Emergency Tepid Water
  • NEMA 4 Standard
  • Up to 88 KW - 1 or 3 Phase

RO / DI Heater Compact

DI/RO electric hot water heater Model HD
  • RO/DI Water Heater
  • Point-of-Use Heater
  • Up to 88 KW - 1 or 3 Phase

RO / DI Heater Storage

DI/RO electric hot water heater Model D
  • RO/DI Water Heater
  • 1-120 Gallon Capacity
  • Up to 88 KW - 1 or 3 Phase

Tepid Water for Emergency Fixtures

Electric safety shower water heater Model EMV
  • Emergency Tepid Water
  • Fully packaged system
  • Integrated mixing valve

Fully Integrated Package

Model Packaged Skid
  • Customized to your specifications
  • Full featured system ready for your application

Light Duty
Electric

Electric water heater for shipboard marine use single phase power Model ME
  • Light Duty
  • 6-120 Gallon Capacity
  • Up to 6 KW - 1 Phase

Large ASME
Electric

Electric water heater for shipboard marine use large capacity Model MSH
  • Large Capacity
  • 80-5000 Gallon Capacity
  • All KW ratings - 1 or 3 Phase

Heavy Duty
Electric

Electric water heater for shipboard marine use three phase power Model MSE
  • Vertical
  • 6-120 Gallon Capacity
  • 1 or 3 Phase - Up to 58 KW

Tankless
Electric

Electric tankless water heater for shipboard marine use model MTX
  • Tankless Marine Heater
  • Provides 180°F water
  • 11 to 54 KW - 1 or 3 Phase

Naval

Naval shipboard marine electric water heater Hubbell Model 177
  • MIL Spec Navy Heaters
  • Comforms to MIL-H-965
  • Shock and EMI protection

Fully Integrated Package

Turn-key hot water system
  • Customized to your specifications
  • Full featured system ready for your application
   

Immersion Heating
Elements

Electric immersion tubular style heaters
  • Immersion Electric Heaters
  • Flanged or Screw Plugs Types
  • All KW ratings - 1 or 3 Phase

Heat Transfer
Coils

Heat exchanger and heating coil water heaters
  • Immersion Heat Transfer Coils
  • U tube type
  • Range of Materials
   
       
Electric High Capacity
Gas Fired
Steam Fired
Indirect
Storage
Special Purpose
Marine
Elements & Exchangers
Resource Center
Condensing gas storage tank water heater Model GXT
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Model GXT

Turn-Key Gas Water Heater

Available from 199 - 2500 MBH with any size tank

The Hubbell GXT is the longest lasting gas fired water heater on the market. Unique in the water heating industry for two main reasons: the 1/2" thick cement lined tank and an all 316L stainless steel free floating heating coil. The GXT series integrates the "Best of Both Worlds" combining a high efficiency high recovery gas heater with a properly sized cement lined storage tank, reducing energy consumption and stand-by heat loss. Hubbell offers many different configurations of the GXT ranging from 50 Gallon to 750 Gallon and ranging from 199 - 2500 MBH.

Consult factory. Customized product to meet your needs.


Learn More About Hydrastone Cement Lining

cETLUS Listed (Heat Exchanger) Ultra Low NOx ASME Optional
  • Features

    • 316L stainless steel floating heat exchanger design
    • Built-in Circulation Pump
    • Intuitive digital controls with Tank Loading Feature
    • Common venting using PVC, CPVC & Polypropylene
    • Top mounted plumbing/gas connections
    • Energy Star, Ultra low NOx certified on 199 MBH Burner
    • Convert to LP without changing parts
    • Temp settings to 145°F or 185°F
    • Radial down-fire burner
    • Six (6) Year Heat Exchanger warranty
    • Ten (10) Year Non Pro-Rated Tank warranty

Standard Equipment

Burner Construction
  1. All 316L unwelded free floating coil
  2. Top mounted connections
  3. Energy Star Rated (199 MBH Burners Only)
  4. SCAQMD, UltraLow Nox
Vessel Construction
  1. 1/2" thick Hydrastone cement lining, Non-ferrous solid copper-solicon threaded openings for maximum corrosion resistance
  2. Units over 120 gallons ASME construction standard
  3. Designed for 150 psi working pressure and tested at 225 psi (1 1/2 times the WP)
  4. Heavy duty 2" thick polyurethane foam insulation covers 100% of the pressure vessel or maximum operating efficiency and minimal standby heat loss
  5. Full ten (10) year Non Pro-Rated tank warranty
  6. ASME rated combination temperature and pressure safety relief valve set at the vessel working pressure and 210°F

How It Works

The Hubbell GXT is the longest lasting gas fired water heater on the market. The Hubbell GXT features a 1/2" thick hydrastone cement lined tank paired with an on-demand gas tankless system making it unique in the water heating market and providing the best of both worlds. The Hubbell GXT includes an all 316L stainless steel non-welded free floating coil giving the unit the ability to flex throughout the heating cycle providing longer service life.

GXT How It Works

Model GXT Water Heater Specifications

Specifications Burner
199 MBH 250 MBH
Type Indoor, Wall hung, Fully condensing
Fuel Preset for NG / LP convertible
Minimum / Maximum Input (Btu/h) 30,000 / 199,950 30,000 / 250,000
Combustion Efficiency 98%
Thermal Efficiency 94% 92%
Energy Factor 0.93 N/A
Gas Inlet Connection 3/4" NPT
Ignition Electronic Spark Ignition
Venting Type Direct Vent (2 pipe - intake & exhaust), Power vent (1 pipe - exhaust only)
Venting Materials Sch. 40 PVC, Sch. 40 CPVC, Polypropylene, Stainless Steel
Max 3" Vent Length - Single Pipe / Power Vent 200 ft, deduct 5 ft per 90° elbow 130 ft, deduct 5 ft per 90° elbow
Max 3" Vent Length - Two pipe / Direct Vent 100 ft, deduct 5 ft per 90° elbow 65 ft, deduct 5 ft per 90° elebow
Max 2" Vent Length - Single Pipe / Power Vent
(2" not allowed at elevations above 4,000 ft)
26 ft, deduct 5 ft per 90° elbow N/A
Max 2" Vent Length - Two Pipe / Direct Vent
(2" not allowed at elevations above 4,000 ft)
21 ft, deduct 5 ft per 90° elbow
Common Venting Yes
Safety Features Flame Rod, Thermal Fuse, Overheat Prevention Device, Fan Speed Monitor, Flue Temperature Monitor, Blocked Vent Detector, Water Leak Detector, Water Shut Off Valve, 2X10A Fuse, Dual Flame Sensing
Water Pressure Min / Max (PSI) 30 / 150
NG/LP-Minimum Static Gas Pressure 1/2" 5" (non-corrugated, black iron) 6" (non-corrugated, black iron)
NG/LP-Minimum Static Gas Pressure 3/4" 2.5" (non-corrugated, black iron)
NG/LP-Maximum Static Gas Pressure 14"
Gas Pressure for Adjustments 8" for NG, 11" for LP
Electrical 120V AC, 60 Hz
Power Consumption 500W (Max 4.2 Amps), 8W (Standby)
Certifications 199 MBH 250 MBH
Energy Star Listed Yes No
SQAQMD Certified 2012 Low Nox Yes No
ETL/cETL Listed (ANSI Z21.10.3 and CAN/CSA 4.3) Yes Yes
Performance 199 MBH 250 MBH
Hot Water Capacity (35°F Rise) 10.8 GPM 13.2 GPM
Hot Water Capacity (45°F Rise) 8.4 GPM 10.3 GPM
Hot Water Capacity (77°F Rise) 5.0 GPM 6.0 GPM
Commercial Mode Temp. Setting Range 100 - 185°F (adjustable 1° increments)
Warranty Heat Exchanger Coil - 6 years, Parts - 5 years, Tanks - 10 years Non-Prorated
Note: Energy Star and SCAQMD Certified 2012 Low Nox on 199 MBH
Continuing research results in product improvement; therefore specifications are subject to change without notice. For most updated information, consult the factory directly.

Outline Dimensions

Dimensional Data

Overall Dimensions

Base Model Storage
Capacity
(Gallons)
Tank
Orientation
Tank Code
Construction
Overall Dimensions (Inches) Inlet/Outlet
Size
(NPT)
Shipping
Weight
(Lbs.)
Maximum
Total BTU/Hr
(MBH)
Height
"A"
Depth
"B"
Width
"C"
GXT50 50 Vertical Commercial 51 36.5 22.75 1 - 1/2" 395 Up to 250
ASME 39 40 26 590
GXT65 65 Commercial 48 39.75 26 435
ASME 48 39.75 26 435
GXT80 80 Commercial 48 39.75 26 660
ASME 59 39.75 26 800
GXT100 100 Commercial 69.5 39.75 26 525
ASME 66.5 39.75 26 950
GXT120 120 Commercial 69.5 41.75 28 595
ASME 68.5 41.75 28 1000
GXT150 150 ASME 79 45 30 1200 Up to 500
GXT200 200 82 49 34 1800
GXT400 400 85 61 46 2675 Up to 750
GXTH400 400 Horizontal 52 79 (Long) 61 2800 Up to 1,000
GXTH750 750 58 107 (Long) 67 2" 4250

BTU Inputs & Recovery Ratings

Total BTU/Hr Rating (MBH) Quantity & Size of Burners Recovery Rate (GPH)
70°F Rise 90°F Rise 100°F Rise
199 (1) 199 322 251 226
250 (1) 250 394 307 276
400 (2) 200 645 501 451
500 (2) 250 789 613 552
600 (3) 200 967 752 677
750 (3) 250 1183 920 828
800 (4) 200 1289 1003 902
1,000 (4) 250 1577 1227 1104

Optional Features

Burner
  • ASME Construction
  • All 316L Stainless Steel Welded
  • NEMA 4X (Outdoor Construction)
Vessel
  • ASME Tank Construction
  • Storage Tank Construction from (304L or 316L Stainless steel)
  • Foam Insulation 3" Thick For Improved Operating Efficiency
Configurations
  • External Pump (High Recovery)
  • Rack Mount System Option
  • Skid Mount System Option
  • BMS Integration

Additional Configuration Options

Optional Configurations for GXT

Model Number Designation



Step 1
Model:
GXT = Vertical
GXTH = Horizontal

Step 2
Storage Capacity:
(Gallons)
50
65
80
100
120
150
200
400
750

Step 3
Tank Lining:
SL = Hydrastone Cement Lined Tank
SS = Solid Stainless Steel
(specify 304L or 316L)

-

Step 4
Tank Construction:
C = Commercial
A = ASME

-

Step 5
Burner Rating:
(MBH)
199
250
400
500
600
750
800
1000

Example:

GXT100SL-C-250

Base Model GXT gas fired storage water heater with a 100 gallon cement lined steel storage tank with a 250 MBH condensing gas tankless water heater.

Option Note

Any and all optional equipment for a water heater must be called out in the written specifications. A model number in and of itself does not reflect any optional equipment selected.

Configuration Guide

Base Model Storage Capacity (Gallons) Tank Orientation Tank Code Construction Maximum Total BTU/Hr (MBH)
GXT50 50 Vertical Commercial Up to 250
ASME
GXT65 65 Commercial
ASME
GXT80 80 Commercial
ASME
GXT100 100 Commercial
ASME
GXT120 120 Commercial
ASME
GXT150 150 ASME Up to 500
GXT200 200
GXT400 400 Up to 750
GXTH400 400 Horizontal Up to 1,000

Downloads

Many of our products literature is available online for download. To open these files, a PDF viewer is required. If you do not have one, Adobe provides Acrobat Reader free of charge for viewing only. Use this link to download Acrobat Reader. You may also choose to download the file to your PC for future reference or printing. On most operating systems, simply right-click on the links below, choose "Save target as..." or "Save link as...", choose a location and it will save the document to your computer for future reference.

Model GXT Specific Questions

Are any Federal, State, local or utility incentives available?

Depending upon your location and the type of water heater you select for your application, there may be financial incentives offered by local, state or federal government and/or your local utility. By visiting the following website at Incentives and clicking on your state, you may find available rebates and incentives.

What temperature should I set my water heater?

For typical domestic potable hot water service the temperature of your water heater at 125°F is sufficient. This prevents wasted energy (which means cost savings for you) and also decreases the possibility of scalding water burns. If you run out of hot water on this setting, increase the temperature by five degrees incrementally until your hot water needs are met. The goal is to have the temperature set just high enough to meet your needs but within safe operating parameters. Please note that a water heater in and of itself should not be relied upon as the ultimate temperature controlling source for the hot water delivered to your fixtures. Please consult local and state codes for installation of the proper and code approved (ASSE 1016, 1070, 1017) mixing devices to achieve the safe delivery of hot water to the fixtures. For a more complete information please download the whitepaper PDF titled "Understanding Potential Water Heater Scald Hazards" developed by ASSE at the following link ASSE Whitepaper

Is it OK to use softened water with my cement lined tank?

Yes it is OK. A water softener system will not affect the longevity or operation of a Hubbell cement lined water heater tank. A water softener is typically installed when a potable water system has hard water resulting in the need to soften the water. Unfortunately, the salt used in a water softener corrodes the anode rod and exposed steel surfaces of the water heater tank, rapidly causing a glass lined water heater to corrode and leak within a few years. This is an issue for a glass lined water heater due to its reliance on a sacrificial anode, however because a cement lined tank does not use a sacrificial anode softened water is of no concern to the Hubbell cement lined tank.

What is a sacrificial anode and does a cement lined tank need one?

All water heaters constructed using a steel tank requires a lining to protect the internal steel surfaces from corrosion. Certain linings (i.e. glass and epoxy), due to their nature, have unavoidable holes and imperfections resulting in exposure of the steel tank. As a result of this deficiency, the manufacturer will install an anode rod(s) in an attempt to delay corrosion of the steel tank. An anode rod is typically made of aluminum, magnesium or zinc, is a maintenance item that requires periodic inspection and replacement, and is often times the cause of a “rotten egg” odor to your hot water. Often referred to as a sacrificial anode rod because, over time, it slowly dissolves, sacrificing itself as it is attacked by aggressive substances in the water which would otherwise attack the steel tank through the pinholes and imperfections of the glass or epoxy lining. A cement lined steel tank on the other hand does not require an anode because of the thickness and guaranteed 100% coverage of the cement lining over all internal surfaces of the steel tank. This eliminates the need for an anode rod in a cement lined water heater, resulting in a significantly longer life compared to a glass or epoxy lined water heater. For a further discussion please click on the following link Cement Lining

What is the max water temperature setting?

The Hubbell cement lined tank is suitable for storing water up to 194°F. However, it should be noted that your water heater will likely require optional control accessories to achieve this temperature, but there is no concern regarding the ability of the lining to withstand this temperature. Additionally, there are numerous safety concerns that must be considered when storing water at elevated temperature, please consult factory.

General Questions

Where can I purchase a Hubbell water heater?

There are numerous ways to purchase a Hubbell water heater depending upon the model you desire and your geographic location. The easiest way is to contact Hubbell directly at 800-647-3165 and ask for the sales department where you will be directed to either our local representative or our order entry department for quick and easy ordering.

Where can I purchase replacement parts?

Parts are available for your Hubbell water heater direct from the factory. Please call 800-647-3165 and ask for our parts department. Please have your model and serial number handy.

I don't see the size or feature I need, what do I do?

Hubbell has more than 35 product families available in over 4,000,000 configurations. There are numerous features, configurations and ratings we provide but for practical reasons are are not listed in the sales brochure. If you have a specific requirement and you do not see it in the brochure, please contact a Hubbell Sales Engineer...chances are we have what you need.

What should I know about Legionella disease?

Legionella is the bacteria responsible for Legionnaire’s Disease, an acute bacterial infection of the lower respiratory tract. This bacterium was first identified in 1977 by the Centers for Disease Control as the cause of an outbreak of pneumonia that caused 34 deaths at a 1976 American Legion Convention in Philadelphia. Pontiac Fever is a less severe, non-pneumonia, flu-like disease that is associated with and likely caused by Legionella bacteria. Legionella is a fairly common water bacterium and has been found to exist widely in many surface water sources including lakes, rivers, streams and ponds. It can also be found in ground water sources and some soils. At the levels found in these naturally occurring sources it typically does not pose a threat to public health. When the bacterium enters a domestic water system it can find an ideal host environment of warm water temperatures (105-115°F), stagnant water areas (isolated storage tanks and dead-end piping legs) and ample food sources (sediment, scale, deposits and biofilm). Under these conditions Legionella can rapidly colonize, forming higher concentrations that can pose the public health threat of Legionnaire’s Disease. There are many methods of controlling colonization of Legionella bacteria. However, a widely accepted and preferred method is to maintain the hot water system storage temperature continually at or above 140°F. Unfortunately, the elevated temperature necessary to minimize the growth of and kill Legionella bacteria has the potential to cause serious thermal shock and scalding injuries. As such, many plumbing engineers will specify that the water heater be set to maintain water temperatures at 140°F or higher to reduce the risk of Legionella, but then specify the appropriate mixing valve to ensure safe delivery of hot water to the fixtures. For a more thorough discussion of Legionella please go to here and the following link to the US Department of Labor OSHA information regarding Legionnaires’ Disease OSHA here

My question is not found in these FAQ’s, where do I look next?

Check out the Hubbell Product Center at Here for a complete listing of all technical documentation available by model. Get easy access to Installation, Operation & Maintenance manuals, Sales Brochures, Service Bulletins, Wiring Schematics, Parts Breakdowns and various other technical documents related to the full line of Hubbell water heaters. Or, if you prefer, please call us at 800-647-3165 and ask to speak to a Sales Engineer.

Model GXT Specific Questions

My question is not found in these FAQ’s, where do I look next?

Check out the Hubbell Product Center at Here for a complete listing of all technical documentation available by model. Get easy access to Installation, Operation & Maintenance manuals, Sales Brochures, Service Bulletins, Wiring Schematics, Parts Breakdowns and various other technical documents related to the full line of Hubbell water heaters. Or, if you prefer, please call us at 800-647-3165 and ask to speak to a Sales Engineer.

Where can I purchase replacement parts?

Parts are available for your Hubbell water heater direct from the factory. Please call 800-647-3165 and ask for our parts department. Please have your model and serial number handy.


For Further Assistance Please Contact a Hubbell Tech Support Rep.

Sam Wellington
samw@hubbellheaters.com
203-378-2659 x136
D.J. Dineson
djdineson@hubbellheaters.com
203-378-2659 x125
Hubbell Heaters
45 Seymour Street
P.O. Box 288
Stratford, CT 06615-0288
Tel: 203-378-2659
Fax: 203-378-3593
Product Center
Hubbell Binder

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