Model D

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.

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.

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.

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.

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.

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.

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.

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.

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

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.