Your browser is out of date.

You are currently using Internet Explorer 7/8/9, which is not supported by our site. For the best experience, please use one of the latest browsers.


Deionized (RO/DI) Water Heater

Hubbell UltraPure HD

RO/DI Water Heater
Point-of-Use Heater
Up to 88 KW Single Phase or Three Phase Voltages

Request a Quote
Deionized (RO/DI) Water Heater


The Hubbell Model HD Deionized (RO/DI) Water Heater is a dependable and trouble-free source for hot water in continuous, cyclical, or variable flow systems in a wide range of hot deionized water, RO water and mildly corrosive applications. The heart of the HD Model is a solid 316L stainless steel ASME stamped pressure vessel which is impervious to the corrosive effects of hot water and provides maximum vessel longevity. Only the highest quality materials and components are used to ensure reliable operation in even the most demanding application. The HD Model is ready for immediate installation and service and all electrical operating controls are factory selected, sized and wired.

When you specify and install a Hubbell Model HD, you will have confidence in knowing the owner will be provided with a trouble-free and long lasting source for hot RO/DI water.


Find a Rep


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

  • Small reserve capacity lowers peak power demand and reduces operating costs
  • Most models are easily upgradeable to handle future expansion
  • Full range of sizes available to meet your exact heating needs

Why Install A Hubbell RO/DI Water Heater?


  • The Hubbell RO/DI water heater is designed to provide many years of operation. The tank is all 316L stainless steel construction and is designed, constructed and stamped in strict conformance to ASME Section VIII.

Lower Operating Costs

  • The Hubbell pressure vessel is encapsulated in environmentally friendly CFC/HCFC free closed cell foam insulation to minimize stand-by heat loss. This high quality insulation reduces heat loss by more than half when compared to fiberglass type insulation.

Advanced Construction

  • Provides trouble-free system integration, operation and maintenance. Temperature control is provided by an electronic solid state digital display controller. The controller is fully adjustable from 32-194°F (0°-90°C) and includes an adjustable temperature differential. The heater includes an integral low water cut off feature to prevent the heating elements from dry firing and an internal leak detection sensor notifies an operator if water is present in the control cabinet. For further ease of service and maintenace, all controls are mounted such that when a component is removed for service no other component needs to be removed and all sensing functions are integrated into one probe. The heating element and sensing probe are straight thread screw types that utilize an O-ring to minimize leakage problems as is common with flat gaskets and NPT connections.
Deionized (RO/DI) Water Heater Diagram


Deionized (RO/DI) Water Heater Chart
Deionized (RO/DI) Water Heater Pressure Chart

Model HD6 (1.5 to 18 kW) Dimensions

Deionized (RO/DI) Water Heater Diagram 2
Deionized (RO/DI) Water Heater Model Number Chart


  • The 6, 7 and 9 kw models in 208 and 204 volt can be field converted from either 1 phase to 3 phase or from 3 phase to 1 phase

Model HD6 (24 to 58.5 kW) Dimensions

Deionized (RO/DI) Water Heater Diagram 3
Deionized (RO/DI) Water Heater Model Number Amp Chart

Model HD Sizing Information

Deionized (RO/DI) Water Heater Variable Chart

Optional Equipment

  • Slide mounting bracket for hanging installation (Model HD6 and HDF6 only)
  • Form fitted protective outer cover for wet locations
  • Flanged inlet/outlet connections (sanitary or ANSI Class 150)
  • Flanged toe stainless steel legs for floor mounting
  • Alternate threaded inlet/outlet connection size (Model HD16 only)
  • Remote control package
  • Alarm contact for fault condition (N.O. or N.C.)
  • Pump interlock terminal block to prevent energizing when pump is not on
  • Sanitary connections
  • Solid state power controllers for increased temperature accuracy
  • Additional tank tapping
  • Low Temperature Alarm
  • Factory supplied manifold kit single point connection for redundancy and high demand applications

Fully Packaged Systems

  • Engineered and built to meet your exact needs
  • Factory integrated system simplifies installation
  • Factory selected components ensures reliable performance as a system
Deionized (RO/DI) Water Heater Products

Contact us directly to discuss your Packaged System


Optional Clean In Place Design

  • The ability for a piece of equipment to be CIP (Cleaned-In-Place) or SIP (Sterialized-In-Place) is a crtical feature important to many industries including the food, dairy, beverage, biotechnology, pharmaceutical, cosmetic and medical industries. In these industries there are hot water applications which require the water heating equipment to be designed and constructed for use in a hygienic environment. To meet this need, Hubbell offers as an optional feature an electropolished and passivated vessel design which includes a removable rear flange to facilitate inspection, cleaning and sterilization of the interior of the water heater vessel with minimal disruption to the production process. This optional feature, designated as the Hubbell HDF6 base model, is available in 6 gallon capacity and power ratings ranging from 1.5 to 58.5 KW. The drawing below depicts the removable flang feature, and the selection chart below provides details on all available sizes.
Deionized (RO/DI) Water Heater Diagram4
Model Number Selection Chart With Amperage
Base Model KW Rating Storage Capacity (Gallons) Full Model Number Listed By Voltage & Phase Amperage Draw By Voltage & Phase
120 V 208 V 240 V 480V 600V 120V 208 V 240 V 480 V 600 V
HDF6 1.5 6 Gallons HDF61A               13              
2.5 HDF62A               21              
4   HDF64RS   HDF64S   HDF64T4S       19   17   8    
6   HDF66RS HDF66R HDF66S HDF66T   HDF66T4 HDF66T6   29 17 25 14   7 6
7   HDF67RS HDF67R HDF67S HDF67T     HDF67T6   34 19 29 17     7
9   HDF69RS HDF69R HDF69S HDF69T   HDF69T4 HDF69T6   43 25 38 22   11 9
10   HDF610RS HDF610R             48 28          
12   HDF612RS HDF612R HDF612S HDF612T   HDF612T4 HDF612T6   58 33 50 29   14 12
13.5   HDF613RS HDF613R HDF613S HDF613T   HDF613T4 HDF613T6   65 38 56 33   16 13
18   HDF618RS HDF618R HDF618S HDF618T   HDF618T4 HDF618T6   87 50 75 43   22 17
24   HDF624RS HDF624R HDF624S HDF624T   HDF624T4 HDF624T6   115 67 100 58   29 23
27   HDF627RS HDF627R HDF627S HDF627T   HDF627T4 HDF627T6   130 75 113 65   33 26
36   HDF636RS HDF636R HDF636S HDF636T   HDF636T4 HDF636T6   173 100 150 87   43 35
40.5   HDF640RS HDF640R         HDF640T6   195 113         39
45     HDF645R HDF645S HDF645T   HDF645T4       125 188 108   54  
54     HDF654R   HDF654T   HDF654T4 HDF654T6     150   130   65 52
58.5     HDF658R   HDF658T   HDF658T4 HDF658T6     163   141   70 56



Technical Support

Our Technical Support Reps are ready to assist you. Please contact us today.


* indicates required field


Hubbell's Quality Policy

Hubbell, The Electric Heater Company, is committed to providing high-quality products and services that meet or exceed the customer's expectations and requirements. The Company is dedicated to achieving this objective through implementation, monitoring, and continuous improvement of a Quality Management System that complies with the international ISO 9001 standard.

Get In Touch

Do you need more information or want to talk directly with a Hubbell representative? Please submit your questions using our form and we will get back to you shortly.

Thank you for reaching out to us, we look forward to providing you with excellent service.