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.

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.

Thermal expansion is created when water in a hot water system expands due to increasing temperature. When there are no faucets/fixtures open to release the excessive pressure caused by the water being heated up, and if there is no expansion tank in the system to absorb the expanded water, then it is likely that the water heater T&P (temperature and pressure) relief valve will open slightly and begin to drip to release the excessive pressure. This is not a condition that the T&P relief valve is intended, it is a safety device not an operational device. Thermal expansion can be evident immediately upon a new installation when a cold system is first undergoing heat up, or even occur years in the future due to seemingly unrelated changes to the plumbing system but enough so that thermal expansion becomes a problem. If Thermal expansion is present a properly sized expansion tank should be installed to resolve this problem.

A temperature and pressure (T&P) relief valve is a safety device intended to relieve excessive pressure (typically >150psi) or excessive temperature (210°F/99°C). Typically, a dripping T&P is most likely the result of excessive pressure build up in the water heater. When a T&P opens due to excessive temperature, you will most likely see a significant amount of steam in the air as the water flashes into steam as it discharges from the T&P. A relief valve discharging due to excessive pressure is by far the most common reason for relief valve discharge. It is also worth noting that a T&P relief valve will begin to open when pressure is within 5% of its set pressure rating, as an example a 150psi relief valve will begin to open and “weep” at 142psi. See FAQ relating to thermal expansion for a more detailed discussion of this problem.

There are numerous ways to purchase a Hubbell water heater, mainly 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, local wholesaler or dealer, internet or our own order entry department for quick and easy ordering.

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”.

Yes, it is recommended that a thermal expansion tank be installed with your water heater, and in many instances this is required by code. When water is heated it expands. If your system is “open” then water can backflow into the water main and this “extra” expanded water simply flows back out your system. Increasingly, plumbing systems are being closed off and backflow prevention valves are being placed between homes and the water main. This is done for a variety of reasons. For example, increasingly valves are placed between homes and water mains to protect plumbing systems from inlet water pressure. Water pressure is increasing in many cases in order to meet the demands of more densely populated areas. If your system is “closed”, then this means when you heat your water and it expands, this increased volume has nowhere to go. As water is not a very compressible material, this causes sudden increases in water pressure which can damage your water heater and your other appliances. A thermal expansion tank is a pressurized tank typically located in line immediately before the water heater. The tank contains a pressurized bladder. As your water expands, it pushes against this bladder giving the increased volume a place to go preventing rapid pressure increases due to thermal expansion. If your system is closed, installing an expansion tank may lengthen the life of your water heater by preventing excessive pressure cycling. In addition, if your home has a history of leaky faucets or other appliances that wear out prematurely, an expansion tank may fix your problem.

All provinces of Canada have adopted the ASME Code and require vessels to be stamped with a provincial registration number in addition to the ASME symbol and National Board stamping. Before construction begins, one requirement has to be met in all provinces of Canada. We must submit blueprints and specification sheets in triplicate of all designs for approval and registration by the chief inspector of the province in which the vessel is to be used. After the chief inspector receives the drawings, they are checked by an engineer to determine their compliance with the Code and also with provincial regulations. A CRN number is assigned and must be stamped on the vessel in addition to the ASME symbol and National Board stamping. Once the design has been approved and registered, any number of vessels of that design can be built and used in the province where it was approved. This process is repeated for each province. The Canadian provinces also require their own manufacturer's affidavit form, with the registration number and the shop inspector's signature on the data sheets. Finally, when a vessel is delivered to a purchaser in Canada, an affidavit of manufacturer bearing registration number and the signature of the authorized shop inspector must be sent to the chief inspector of the province for which it is intended.

The Hubbell water heater is built to both US and Canadian Standards under UL1453 (water heating only) file KSBZ.E239672 or UL834 (boilers and water heating) file BDJS.E51660. In addition, the Hubbell pressure vessel storage tank is built and stamped to ASME and National Board Registered. Other approvals are available upon request at the time of quoting, including CRN (Canadian Registration Number), NR-13 (Brazilian Regulation Standard Boilers and Pressure Vessels), ABS (American Bureau of Shipping), SASO (Saudi Arabia Standards Organization) and others. Please consult with your Hubbell Sales Engineer to discuss your third party approval requirements.

Yes. All replacement parts for the Hubbell water heater are available from the factory. Please call 800-647-3165 and ask for our parts department. Please have your model and serial number handy. Most parts are in stock and orders placed before noon typically ship same day. However, it should be noted that the heating element component is typically not a stock item, with delivery times ranging from 2 to 10 weeks depending upon the design, it is recommended that you consider having a replacement heating element on hand if your application is critical.

The Hubbell CR model circulation heater is commonly used in applications heating industrial process water, potable domestic water, water glycol mixtures, water ethylene glycol mixtures, seawater, demineralized water and RO or DI water. Additional fluids that can be heated by the Hubbell CR circulation heater include oils, sugars and others, please consult a factory sales engineer for details. It should be noted that a Hubbell sales engineer will help to select the appropriate materials of construction and operating features necessary for the proper operation of the model CR circulation heater in your application.

The Hubbell electric heating element also referred to as the immersion heater, tubular heater, or simply heating element, is the component within the Hubbell CR circulation heater that actually heats the fluid. Watt density is the term which indicates the amount of heat flux emanating from each square inch of the effective heating area (heated surface) of the heating element and is expressed as watts per square inch (W/in2). For most potable water applications, the watt density can range from 50 – 100 W/in2. For corrosive water and other water based fluids the watt density can range from 20 – 50 W/in2. For petroleum oils and higher viscosity fluids with poor thermal conductivity, watt density can range from 6 – 40 W/in2. It should be noted that a Hubbell sales engineer will help to select the appropriate watt density, materials of construction and operating features necessary for the proper operation of the model CR circulation heater in your application.

Yes, as long as you advise the Hubbell sales engineer and specify this in your quote request. The Hubbell CR circulation heater can include construction features making it suitable for a wide range of installation locations including outdoors, but this must be specified when requesting a quote from Hubbell.

Yes, as long as long as you advise the Hubbell sales engineer and specify this in your quote request. You will need to advise your Hubbell sales engineer specific information regarding the hazardous location rating you require for your application including Class (I, II or III), Division (1 or 2), Group (A, B, C or D) and finally the Temperature Class (T1 thru T6). Hubbell carries UL approval for “Control Panels and Assemblies for Use in Hazardous Locations” under file NNNY.E358352 Here and “Control Panels and Assemblies for Use in Hazardous Locations Certified for Canada” under file NNNY7.E358352 Here

Yes, as long as you advise the Hubbell sales engineer and specify this in your quote request. Hubbell builds the CR model circulation heater to either UL1453 (water heating only) under file KSBZ.E239672 or UL834 (boilers and water heating) under file BDJS.E51660. There are slight differences between the two designs, so it is important to know what the application is during the initial quote request phase.

Yes. Hubbell often times integrates pumps and ancillary equipment with a model CR circulation heater to provide a fully packaged and integrated skid system.

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.