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Electric Tankless Water Heaters for Foodservice

Hubbell Model JTX

Tankless Booster Heater
Single or Three Phase Voltages

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 Electric Tankless Water Heaters for Foodservice


The Hubbell model JTX electric tankless water heater is a highly reliable and easily maintained heater designed for operation in your commercial kitchen. The Hubbell JTX electric tankless water heater is compact, extremely efficient, takes up no floor space, and reduces operating costs. Hubbell's vast experience, meticulous engineering and advanced technology ensure that you can rely on the model JTX for your sanitizing rinse needs. The Hubbell JTX Tankless Booster Heater is the right choice for your booster heating requirements, as you will be providing your customer with a quality product that is long lasting, trouble-free and energy efficient.


Heavy Duty Construction
  • Constructed with high grade materials to ensure long operating life
  • Turn-Key package is simple to specify and easy to install and operate
  • Factory wired electrical controls provide trouble-free installation and operation
Advanced Design
  • Engineered specifically for use in commercial kitchens
  • Digital display provides clear indication of set point temperature and fault conditions
  • Wide selection of sizes to meet the needs of all dishmachine manufacturers
  • Compact wall mount design saves precious floor space
High Efficiency
  • On demand heating provides environmentally friendly low cost operation
  • Instantaneous design essentially eliminates stand-by heat loss and signifcantly lowers operating costs compared to traditional tank type booster heaters
  • Over 98% efficient and saves over 2300 kW hours per year compared to tank type booster heaters

Tankless Water Heater Specifications

Heating ChamberCopper and Bronze
MountingBulkhead Mounted
Capacities8 through 54 kW
OrientationWall Mounted
Voltages208 thru 600 Volt 50/60 Hz
Phase1 Φ and 3 Φ (Balanced)
Power Factor0.999
Thermal Efficiency98% +
Thermostat Range32-194°F / 0-90°C
Hi-Limit200°F (Fixed)
Design WP100 psi
Design TP300 psi
ElementIncology 800
EnclosureStainless Steel Brushed Finish
Chamber Warranty* Residential: 5 Years * Commercial: 5 Years
Electrical Warranty* Residential: 1 Years * Commercial: 1 Years
EnclosureStainless Steel Brushed Finish
ApprovalscULus, UL EPH ANSI / NSF5
Max Inlet Temp150°F
Standby Power< 3 Watts
Inlet / Outlet Size* JTX: 3/4" Dielectric Union Copper Sweat * JHX: 1" Dielectric Union Copper Sweat
Min/Max Flow* JTX: 0.2 GPM Min, 8.0 GPM Max * JHX: 0.5 GPM Min, 40 GPM Max * 0.2 GPM Min, 8.0 GPM Max

General Specifications

Temperature Controller

A sophisticated electronic temperature controller with LED digital display provides the user interface. The temperature controller processes all flow and temperature data and calculates the precise amount of power needed to meet demand.

General Specifications

 Hubbell Heaters Operator Control Capabilities
Full Heater Modulation

Each heating element is switched on/off using a fast acting solid state triac with zero cross over firing control. This switching schema provides full modulation of each heating element, ensuring that the precise amount of heat is added to meet demand. To improve operating efficiency and component longevity, each triac is mounted to a heat sink located on the incoming supply piping so that heat generated by the triac during the switching process is dissipated into the water.

Proper Power Integrity

All Hubbell tankless water heaters, including all 3 phase models, are engineered to operate as a balanced load and operate at 0.999 Power Factor. All Hubbell 3 phase models are designed for 3 wire (3 live, 1 ground) and 4 wire power systems and draw equal current across all conductors to maintain the power integrity of the users electrical system. Hubbell does not recommend the use of heaters that operate as an unbalanced load, as is common with staged heaters designed for star systems (3 live, 1 neutral, 1 ground) that require use of the neutral leg. All load switching in Hubbell tankless models is performed as zero cross over, eliminating phase angle firing interference and associated EMI issues.

Full Resource Staging

The Hubbell tankless control schema ensures that usage is equalized across all heating circuits. To achieve this, once the controller has calculated the precise amount of kW required, all circuits are energized in a staggered fashion such that each circuit is proportionally and independently energized and then time staggered between circuits. This Full Resource Staging Schema reduces EMI output, increases component longevity, and provides highly accurate and consistent hot water temperatures. For three phase models, all circuits are fully modulated and synchronized to operate as a balanced load.

Building Management Integration

Remote Control: Ability to remotely enable or inhibit the heating operation of the unit using one of the following two methods:

  1. Customer supplied 24VDC signal is user configured for either Inhibit Mode or Normal Operation Mode.
  2. Customer supplied volt free contact is user configured for either Inhibit Mode or Normal Operation Mode.
Priority Control: An integrated SPDT potential free dry contact (NO/NC 10A @ 240VAC) energizes when the unit is heating and de-energizes when not heating. This feature is useful when it is desirable to give the water heater priority over another electrical load to ensure that both are not operational at the same time.


8-27 KW Models (2 and 3 Elements)

8-27 KW Models (2 and 3 Elements) Diagram
Hubbell Water Heaters JTX Model KW Selection Chart

Note: Chart indicates three element (3) and two element (2) model types

24-54 KW Models (6 Elements)

24-54 KW Models (6 Elements) Diagram
Hubbell Water Heaters JTX Model KW Selection Chart 2


  • All models shown in this chart are six element (6) model types
  • The Hubbell Model JTX is designed for use with conveyor and flight type dish machines. This product is not intended for use with door style machines.
  • Shaded models are factory supplied with a separate circuit breaker panel box


Optional Equipment
  • Inlet/Outlet Valve assembly simplifies installation and includes unions, shut offs, check valve, drain ports and pressure relief valve
  • Water Treatment System: Provide superior mineral scale prevention and corrosion control by feeding a special blend of scale control compounds into the hot water stream before the booster. The in-line system includes a clear cartridge housing to allow an operator to view the cartridge and determine when it needs replacement without the need to open the system.
  • Shock Absorber: Reduce the harmful pressures resulting from quick closing dishwasher solenoid valves by installing a shock absorber between the booster and the dishwasher.
  • T&P Relief Valve for installation in the hot water outlet piping. (May be required by local code)
  • Remote Control Display allows the heater to be installed in a remote location. The 3" x 5" NEMA 4 display enclosure can be located up to 250' from the heater and gives the operator full remote control and monitoring capabilities
Please note: optional equipment may impact overall dimensions and weight. Please request submittal drawing from factory.


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

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.

Does the Hubbell electric tankless water heater restrict water flow?

No. Hubbell electric tankless water heaters do not restrict water flow. Other brands may incorporate a flow restrictor device within their tankless heater or require a flow restricting device be installed in the plumbing or fixture itself as a method for controlling temperature. This is not the case for Hubbell electric tankless water heaters.

How small is the Hubbell electric tankless water heater?

About the size of an average briefcase. The Hubbell tankless water heaters are a fraction of the size of a conventional storage tank type water heater and they mount on the wall, so you can reclaim 100% of the floor space once occupied by your conventional water heater.

Can the standard Hubbell tankless water heater be installed outside?

No. However, Hubbell does off an electric tankless model with NEMA 4 construction and is suitable for outdoor installation, please see Hubbell model TX.

What temperature should the tankless heater be set to?

The Hubbell electric tankless water heater can be configured by the user to operate in any of three different ranges. Low temperature range is 32-104°F, Standard range is 32-140°F and High Temperature range is 32-194°F. The operator can field configure the electronic controller to operate in any of these ranges, and can then select a set temperature within the selected range that is appropriate for the application. The controller is also field configurable for either °F or °C operation and visual display

What is the difference between gas & electric tankless water heaters?

The most obvious difference between gas and electric tankless water heaters is the energy source that is used. Gas tankless heaters use either Natural Gas (NG) or Propane (LPG), but also use electricity (120v) to power an internal fan and other controls. Electric tankless heaters operate using only electricity. Electric tankless water heaters operate at higher energy efficiency, in the case of Hubbell the thermal efficiency is 98%+, compared to gas tankless which ranges from Energy Factor ratings of 0.82 to 0.96 depending upon model. Electric tankless is more efficient in large part because gas tankless models operate by burning gas, which is harder to control than electricity and is less efficient due to heat lost in the flue exhaust. Gas heaters require exhaust and/or fresh air intake venting, whereas electric heaters do not. Please note that efficiency and operating cost are two different things, to determine operating cost one must consider their cost of energy and usage in addition to the operating efficiency of the heater. Gas tankless water heaters cost more to purchase compared to electric tankless heaters. When replacing a storage tank type water heater with a tankless heater, it should be noted that both gas and electric tankless require changes to the existing plumbing and wiring of the tank they are replacing. When installing a new gas tankless heater, most installations will require a new/upgraded venting and gas line. When installing a new electric tankless heater, most installations will require upgraded wiring to the heater and replacement of the circuit breakers in the electrical panel. The largest available residential and light duty commercial gas tankless water heater is 199,000 BTU/Hr, but the most common size has an output of about 123,000 BTU/Hr. After factoring for energy efficiency, this is equivalent to roughly 36 kW. By contrast, the largest residential/light duty commercial electric tankless water heater is 27 kW, which has an effective output of 91,000 BTU/Hr. In terms of operation and maintenance, a gas tankless heater is considerably more complicated to maintain and service compared to electric tankless. In addition, an electric tankless heater will provide more accurate and consistent hot water temperature throughout a full range of flow rates compared to a gas tankless heater. However, gas tankless heaters because they are available in larger BTU sizes can provide a higher hot water flow rate/temperature rise for very large installations compared to a standard electric tankless heater.

What is the life expectancy of the Hubbell tankless water heater?

Depending on the type of installation, usage and water quality, the Hubbell electric tankless water heater can last from 15 to 25 years. In a typical application when properly maintained a Hubbell electric tankless water heater should have no problem lasting 25 years or more.

Is Tankless right for my application?

It depends. Due to the relative small physical size of a tankless water heater compared to a storage tank water heater, a tankless option can be advantageous from a space and weight saving perspective and can sometimes be installed closer to where you want hot water. Tankless water heaters do not store heated water like a storage type water heater; they only heat water as there is demand and therefore must be sized to meet the maximum flow and temperature rise for the application. Therefore, before proceeding with a tankless heater you must carefully understand your application and review your available power. Hubbell offers a wide range of electric tankless marine heaters go to Electric Tankless for details. It is critical that before choosing to go tankless you have carefully considered all of the factors that sometimes make the tankless option more complicated and risky compared to a storage type water heater.

Which NSF Standard is appropriate for this product?

The appropriate NSF Standard to use is NSF 5, titled “Water Heaters, Hot Water Supply Boilers, and Heat Recovery Equipment”. In the past the lead content requirement was only required in NSF 61 per Appendix G, but within the past few years changes have been made such that Appendix G has been removed and replaced by NSF 372, “Drinking Water System Components – Lead Content”. NSF 5 requires materials approved by NSF 51, “Food Equipment Materials” and the latest edition of NSF 51 requires that the materials comply with NSF 372. Therefore, NSF 5 now complies with the same low lead requirements as NSF 61.

Is this model approved by Massachusetts?

For the current listing of all Hubbell models approved by the Massachusetts Board of Plumbers and Gas Fitters please see the chart below or visit the website directly at
MA Plumbing Approval NumberHubbell ModelExpiration Date
P3-0914-61HD, J, V, PS, SLN, T9/3/2017
P1-1114-201EMV, CR, R, JTX, ETX, TX11/5/2017
P3-0813-66CE110, SE, E, HE, SH, H8/7/2016
G1-0813-4GX, DGX, JBX, JGX, CX8/7/2016

Can my heater ship via UPS?

Yes. Hubbell packages and ships this model water heater via United Parcel Service (UPS).

Is 277 volt 3 phase voltage available for a water heater?

For all water heaters 277V is only an available option in 1PH, not 3PH. The 277V 1PH voltage is a derivation of your existing 480V 3Ph power. Where 480V is the line to line voltage on a 3 phase system and 277V is the voltage from any one of these lines to neutral, thus making the 277V power available in 1PH only.

Do Hubbell water heaters qualify as Low Lead?

Yes, all Hubbell water heater models qualify as meeting the low lead requirements of the “Reduction of Lead in Drinking Water Act” amendment to the “Safe Drinking Water Act” (SDWA) Section 1417(d) effective as of January 4, 2014. Hubbell certifies that its water heaters meet the following requirements of the SDWA and therefore are qualified and certified as Low Lead : (a)Hubbell water heater do not contain more than 0.2 percent lead with respect to solder and flux (b)Hubbell water heaters do not contain more than a weighted average of 0.25 percent lead with respect to all wetted surfaces of the water heater

What is the difference between solid-state and electromechanical relays?

Depending on the application, one switch may be more advantageous than the other. Please refer to this article to read more about the differences between solid-state and electromechanical relays.


Hubbell shall warranty all electrical components against defects in workmanship and material for a period of one (1) year from date of start-up, and the heating chamber for a full five (5) years from date of start-up (for residential service five (5) years heating chamber and three (3) years electrical), provided that the unit is started within three (3) months of date of shipment and installed and operated within the scope of the tank design and operating capability. Labor is not covered under warranty. Each heater shall be shipped with a complete set of installation and operating instructions including a spare parts list and approved drawing.

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Sizing Chart

The Hubbell Model JTX tankless booster heater is designed for use with conveyor and flight type dishmachines. If the dismachine is not listed, or if the application is other than a conveyor or flight type dishmachine, please contact us directly for assistance.

Dishmachine Chart
Hobart Chart
Insiger and Jackson Chart Hubbell Water Heaters
Meiko and Stero Chart Hubbell Water Heaters
  • Note 1: FRC and FR (Fast Rack Series) use comparable "C" line listing.
  • Note 2:C models with serial no. 85-1041605 or greater use Opti-Rinse




  • All sizing shown are that of the dishmachine manufacturers. Hubbell is not responsible for incorrect sizing applications.
  • For outdated models or dishmachines not listed consult Hubbell for recommended tankless booster size.
  • All booster heaters are rated at 100% of the capacity of the dishwasher as recommended by the National Sanitation Foundation.
  • This selector chart is based upon 40°F and 70°F temperature rises, and 20psi flow.