Electric Low Capacity

Light Duty Commercial

Electric cement lined water heater Model E
  • Light Duty
  • 6 - 119 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
  • 19 or 30 Gallon Capacity
  • Up to 20 KW - 1 or 3 Phase

Heat Pump

Hybrid electric heat pump water heater Model PBX
  • Heat Pump Water Heater
  • 40 - 119 Gallon Capacity
  • 1 or 3 Phase

Point-Of-Use Water Heater

Mini compact point of use water heater
  • Point-of-Use
  • 2.5 Gallon Capacity
  • Digital Display

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 Tankless
  • Whole House / Point-of-Use
  • Availabe 3 thru 27 KW - 1 Phase

Circulation (Instantaneous)

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

Industrial Process Heater

Model V16
  • Process Systems & Industrial
  • ASME Stamped
  • Up to 88 KW - 1 or 3 Phase

Heavy Duty Commercial

Commercial heavy duty electric storage water heater Model SE
  • Heavy Duty
  • 6-119 Gallon Capacity
  • Up to 58 KW - 3 Phase

Tankless Commercial

Electric tankless water heater Model HX/TX
  • Tankless Commercial
  • Highly efficient tankless
  • Up to 162 KW - 1 or 3 Phase

Large ASME

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

Commercial Condensing Gas Water Heater

Gas tankless water heater Model NX
  • High Efficiency Condensing Burner
  • 316L SS ASME Heat Exchanger
  • BTU input from 200,000 to 800,000 MBH

Commercial/ Industrial
Condensing Gas Water Heater

Gas tankless water heater Model NXT
  • High Efficiency Condensing Burner
  • 316L stainless steel and ASME stamped heat exchanger
  • BTU input from 200 to 400 MBH

DI / RO Gas

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

Condensing Gas
Storage Water Heater

Condensing gas storage tank water heater Prime
  • High Efficiency Condensing Burner
  • Removable 316L SS Heat Exchanger
  • 55,000 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


Storage tank steam fired water heater Model PS
  • Light Duty
  • 65-119 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 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
  • 35-119 Gallon Capacity
  • Utilizes boiler water


Solar water heater Model SLN
  • Solar Heater
  • Vertical Storage Type
  • 65-119 Gallon Capacity

Indirect Plate Heat Exchanger

Plate Heat Exchanger Indirect Fired Water Heater Model BWP
  • Fully Packaged System
  • Full Range of Styles/Sizes
  • Storage Type

Indirect Plate Heat Exchanger

Plate Heat Exchanger Indirect Fired Water Heater Model BWXP
  • Compact Design
  • Instantaneous
  • Replaceable brazed plate or plate and frame


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


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


Electric hazardous location water heater Model ER
  • Hazardous Location
  • 10-5000 Gallon Capacity
  • Up to 1600 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

Industrial Process Heater

Model V16
  • Process Systems & Industrial
  • ASME Stamped
  • 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
  • 1-119 Gallon Capacity
  • 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

Fully Integrated Package

Model Packaged Skid Electric Fluid Heating System
  • Customized to your specifications
  • Full featured system ready for your application

Industrial Process Heater

Electric process industrial water heater Model V
  • Customized to your specification
  • Full featured system ready for your application

Light Duty

Electric water heater for shipboard marine use single phase power Model ME
  • Light Duty
  • 6-119 Gallon Capacity
  • Up to 6 KW - 1 Phase

Heavy Duty

Electric water heater for shipboard marine use three phase power Model MSE
  • Vertical
  • 6-119 Gallon Capacity
  • 1 or 3 Phase - Up to 58 KW

Large ASME

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


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


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

Fully Integrated Package

Shipboard Electric Water Heating System Model Integrated Skid
  • Customized to your specifications
  • Full featured system ready for your application

Electric Booster

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

Foodservice Tankless
Electric Booster

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

Foodservice Gas
Fired Booster Heater

Gas fired booster heater Model PT
  • Gas Booster Heater
  • High Efficiency Condensing Burner
  • 55,000 to 199,000 BTU

Foodservice Point-of-Use
Water Heaters

Mini compact 2.5 Gallon Booster Heater
  • Hot water for remote locations
  • Perfect for glasswashers
  • 120V models available

Foodservice Sanitizing
Sink Heater

Model JSK
  • Provides rinse water for manual warewashing
  • Perfect for 3 compartment sinks
  • Available in 3,4,6 or 9 KW

Food Rethermalizer Baine-Marie Heater

Model JFR
  • Mounts under sink or holding vessel
  • Keeps food at SERV safe temperature
  • Available up to 9 KW

Foodservice Point-of-Use
Water Heater

Compact point-of-use electric water heater Model J1SSA
  • Point-of-Use
  • 1 Gallon Capacity
  • 1000 Watts - 1 Phase

Immersion Heating

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

Heat Transfer

Heat exchanger and heating coil water heaters
  • Immersion Heat Transfer Coils
  • U tube type
  • Range of Materials

Stainless Steel T & P
Relief Valve

Stainless Steel T & P Relief Valve
  • 316 L Stainless Steel construction
  • Corrosion Resistant
  • ASME Section IV, HV Stamped

Gas Heat Exchanger

gas hx
  • 316 L SS Heat Exchanger/Burner
  • 55,000 BTU/HR input
  • Digital temperature controller
Electric High Capacity
Gas Fired
Steam Fired
Special Purpose
Foodservice Equipment
Elements & Exchangers
Product Center
DI/RO electric hot water heater Model D
Still have questions? Complete this form
*State /

Model D

Deionized (DI) Water Heater

1-119 Gallon Capacity, Up to 58 KW Single or Three Phase Voltages

The Hubbell D model deionized water heater is specifically designed for systems requiring large draws of hot DI water with a fixed period of time between cycles. The KW rating is sized to recover enough capacity during the idle period so that the tank will be fully hot when the next draw down begins. The longer the period of time between usages, the lower the KW input required to heat the water.

Download latest quick facts on RO/DI Water Heaters Download latest whitepaper on RO/DI Water Heaters

cULUS Listed
  • Industrial Grade Construction

    • High grade construction materials provide maximum longevity
    • Packaged with all electrical operating controls for trouble-free installation and operation
    • Designed to operate in even the most demanding applications
  • Corrosion Resistant

    • All Type 316L stainless steel construction resists corrosion
    • Heating elements are all 316L SS to ensure long operating life
  • Proven Design

    • Storage capacity lowers peak power demand and reduces operating costs
    • Many units can be easily upgraded to handle future expansion
    • Full range of sizes available to meet your exact heating needs

Model D Water Heater Specifications

Vessel: 316L Stainless Steel
Capacities: 1 thru 119 Gallons
Orientation: Vertical
Voltages: 120 thru 600 Volt
Phase: 1 Φ or 3 Φ
Inlet/Outlet Size:
1 Gallon Unit: 1/4" Male NPT
3-40 KW: 3/4" Female NPT
45-58 KW: 1 1/2" Male NPT
Relief Valve Opening: 3/4" Female NPT
Thermostat Range:
Surface Type: 110-170°F
Immersion Type: 100-195°F
Electronic Type: 32-194°F
Surface Type: 190°F (Fixed)
Immersion Type: 100-240°F
Electronic Type: 210°F (Fixed)
Design WP:150 psi
Design TP: 300 psi
Elements: 316L Stainless Steel
Insulation: 2" Fiberglass
Tank: 3 Years
Electrical: 1 Year
Jacket: 20 GA Galvanized Steel
Finish: Grey Hammertone

Standard Equipment

  • All Type 316L Stainless Steel construction
  • 316L Stainless Steel immersion electric heating elements, passivated and electropolished
  • Digital display temperature controller
  • Safety Hi-Temperature cut out with manual reset
  • Heavy gauge protective jacket
  • Heavy duty 2" thick energy efficient insulation
  • ASME rated combination temperature and pressure bronze body safety relief valve set at 150 psi, 210°F
  • Low water cut off 316SS float type
    (available on 6-120 gallon models)

Outline Dimensions

Model D Outline Dimensions

Model D Dimensional Data

Base Model Number Storage Capacity (Gallons) KW Range Available Dimensions (Inches) Weight (lbs)
Overall Diameter Overall Height Floor to Inlet "A" Floor to T&P "B"
D1 1 1 9 9 bottom 6 15
HD6-3* 6 1.5 - 18 13 19 3/4 9 5/8 15.5 95
HD6-6* 6 24 - 58.5 18 18 8 1/8 14 110
HD16* 16 6 - 88 31 23 1/2 bottom 19.5 160
D30 30 1.5 - 58.5 20 41.5 5 34 210
D40 40 20 58.75 5 51 225
D50 50 24 44 6 39 325
D65 65 24 52 6 43 350
D80 80 24 61 6 52 450
D100 100 28 53 7 43 500
D120 119 28 66.5 7 57 575
Note: Model D1 is available in 1 KW, 120 Volt or 240 Volt, 1 Phase only.
*For 6 or 16 gallon capacities, please refer to the HD Model

Model D Sizing Information

Model D Sizing Information

GPM Heating Capacity with Amperage Chart

KW Rating Recovery Rate in GPM at °F Temperature Rise Amp Draw By Voltage & Phase
208V 240V 480V
40° 60° 80° 100° 120° 140°
6 1.0 0.7 0.5 0.4 0.3 0.2 29 17 25 15 7
8 1.4 0.9 0.7 0.6 0.5 0.4 38 22 33 19 10
10 1.7 1.1 0.8 0.7 0.6 0.5 48 28 42 24 12
12 2.0 1.4 1.0 0.8 0.7 0.6 58 33 50 29 15
15 2.6 1.7 1.3 1.0 0.8 0.7 72 42 62 36 18
20 3.4 2.3 1.7 1.4 1.1 1.0 96 56 83 48 24
24 4.1 2.7 2.0 1.6 1.4 1.2 115 66 100 58 29
30 5.1 3.4 2.6 2.1 1.7 1.5 144 83 125 72 36
35 6.0 4.0 3.0 2.4 2.0 1.7 169 97 146 84 42
40 6.8 4.5 3.4 2.7 2.3 2.0 192 111 167 96 48
45 7.7 5.1 3.8 3.1 2.6 2.2 216 125 188 108 54
54 9.2 6.1 4.6 3.7 3.1 2.6 259 150 226 130 65
58 9.9 6.6 4.9 4.0 3.3 2.8 279 162 243 139 70
Note: For alternate voltages including 120, 277, 380, 415, 440, 575, and 600 volt, please contact us directly.

Optional Equipment

  • 316 Stainless Steel Temperature and Pressure relief valve
  • 1 1/2" threaded inlet/outlet connections
  • Flanged inlet/outlet connections (sanitary or ANSI Class 150)
  • Immersion safety hi-limit (100-240°F)
  • 304 Stainless Steel protective outer jacket
  • Fused low voltage control transformer (120 V)
  • Power circuit fusing
  • Passivated/Electropolished pressure vessel
  • NEMA 4 construction for wash down areas
  • ASME code stamped pressure vessel

Alternative DI/RO Water Heater Designs

  • For DI/RO water heaters greater than 119 gallons storage, please see Hubbell Model SH.
  • For instantaneous DI/RO water heater typically greater than 60 KW, please see Hubbell Model CR.
  • For semi-instantaneous point-of-use DI/RO water heaters, please see Hubbell Model HD.

Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory.

Model Number Designation D

Step 1
Step 2
Storage Capacity:
1 thru 119 Gallons
Step 3
Upper KW Rating:
Typically 0

Step 4
Lower KW Rating:
1 thru 58

Step 5
Vessel Type:
SS = Type 316L
Stainless Steel

Step 6
A = 120-1-60
RS = 208-1-60
R = 208-3-60
S = 240-1-60
T = 240-3-60
W = 277-1-60
T3 = 380-3-50/60
T7 = 415-3-50/60
T5 = 440-3-60
T4 = 480-3-60
T6 = 600-3-60



A model D with 119 gallon capacity and a 40 KW heating element. Tank is stainless steel and operates at 480V, 3 phase, 60 Hz power.

Search FAQs

Model D Specific Questions

How does my water heater ship?

All Hubbell storage type water heaters ship via common carrier and are classified by the Commodity Classification Standards Board under National Motor Freight Classification (NMFC) class 100. Each water heater is palletized and wood crated. All Hubbell tankless water heaters, when transported using common carrier, ship class 77.5. To provide the lowest transportation cost, in most cases the shipment is made on Hubbell’s account and the freight cost is added to the invoice, commonly referred to as “Pre pay and add”. For very large shipments, the most economical method (LTL or Dedicated Truck) for transporting the water heaters to the final destination will be analyzed by Hubbell's transportation department.

Can I install my heater in a wash down or wet area?

The standard Hubbell model HD is designed for essentially NEMA 1 use to provide a degree of protection to personnel against access to hazardous parts and to provide a degree of protection of the equipment inside the enclosure against ingress of solid foreign objects (falling dirt). For wet areas, or washdown areas, please select optional NEMA 4 or 4X construction and consult with your Hubbell Sales Engineer.

Is the bronze body T&P relief valve OK for my application?

All water heaters require a combination temperature and pressure safety relief valve to relieve excessive water pressure or excessive temperature water in the event of a runaway overheating condition. These relief valves are manufactured with a bronze body with a thermo-bonded (non metallic) coated immersion sensor. After independent third party testing conducted by Analytical Services, Inc. it has been verified that the T&P relief valve has no appreciable effect on the purity and quality of high quality ultrapure DI/RO water. However, should the installation warrant that no yellow metals be present in the plumbing system, as an option Hubbell can supply a 316 stainless steel pressure only relief valve and a separate temperature relief valve can be installed by others.

What is the standard interior finish?

The standard interior surfaces have a mill 2B finish less than or equal to Ra 80. No surface treatment of material or welds is performed. As an option, Hubbell can provide mechanical finishing services for material and welds to achieve a high quality finish. In these applications the end user must specify the surface finish required, typically expressed as Average Arithmetic Roughness (Ra). Ra is the measurement of surface roughness, is the average deviation from a mean surface and for Hubbell products is measured in the Imperial (English) system in micro inches also called “micros” and is a whole number. Please note that this unit of measure is different from the metric system expression of Ra, which is measured in millionths of a meter also called “micrometers” or “microns” and is a decimal number. All Hubbell references to Ra are expressed in Imperial English for all Hubbell products.

What is the difference between threaded NPT and Sanitation flanges?

Sanitary fittings are widely used in the food, dairy, beverage, biotech, pharmaceutical and other sanitary process industries. Sanitary fittings offer a way to connect two parts by creating a seal which is accomplished by means of a round gasket in a groove on the face of the fitting, with the two parts coupled by a re-attachable clamp. Similar to a traditional ANSI flange connection, the sanitary design eliminates the need for a male and female, since the fitting mates to another identical fitting. National Pipe Thread Taper (NPT) is a US standard for tapered threads used on threaded pipes and fittings as a means to form a seal when connecting two pieces. The taper on NPT threads allows two connecting pieces to form a seal when torqued as the flanks of the threads compress against each other. The Hubbell HD model is supplied as standard with NPT cold water inlet, hot water outlet and T&P relief valve connections. A customer with a sanitary system will in most instances install adapters to mate the NPT connection from the Hubbell heater to their sanitary plumbing system. However, as an option Hubbell can provide the model HD water heater with welded sanitary connections, thereby avoiding the use of NPT to sanitary adapters. However, it should be noted that the immersion heating elements are only available in threaded (straight not NPT) style. For the most stringent applications, the Hubbell heater can be specified with the Clean In Place (CIP) option including all electropolished interior surface and removable flanged end for inspection and cleaning, please consult with your Hubbell Sales Engineer for details.

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.


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 D Specific Questions

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.

Tech Support Email

Hubbell Heaters
45 Seymour Street
P.O. Box 288
Stratford, CT 06615-0288
Tel: 203-378-2659
Fax: 203-378-3593
Product Center
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