Designed to give homeowners efficiency and peace-of-mind, our double-wall indirect water heaters come with a limited lifetime warranty on the tank and heat exchanger.
Residential Double-Wall Indirect Water Heaters
Standard features:
- Heat Exchanger – Double wall 1½” O.D. glass coated (Ultonium®) steel coil. The positive leak path between the two walls of the coil ensures the potable water will stay separate from the hydronic fluid.
- Low Heat Exchanger Head Loss – Up to 10 GPM flow, with less than 5 ft. of head loss. Greatly reduces the required pump size for heat exchange.
- Factory Installed Sparge Tube System – Cold water inlet sediment reducing device helps to minimize sediment build up in tank. Increases first hour delivery of water while minimizing temperature build up in tank.
- Ultonium® Glass Lining with Microban® – Applied to the interior surface of the steel for superior protection against corrosion. Microban® antimicrobial technology helps prevent the growth of bacteria, mold and mildew on the surface of the tank lining.
- Fully Automatic Controls – Fast acting surface-mount thermostat for automatic temperature control.
- Supply and Return Connections – The 3/4″ NPT female connections are located on the front for both the boiler supply and boiler return.
- 2″ Non-CFC Foam Insulation – Covers the sides and top of tank to save energy by retarding loss of heat. Also increases jacket rigidity.
- Water Connections – 3/4″ NPT factory installed true dielectric fittings extend water heater life and eases installation.
- Two Protective Aluminum Rods – Provide added protection against corrosion for long trouble-free service.
- Stand-by Heat Loss – Less than 1/2°F per hour (ASHRAE 90.1b current standard).
- Steel Tank – Heavy gauge steel automatically formed, rolled and welded to assure a continuous seam for glass lining.
- T&P Relief Valve Included – All models feature opening on side of tank.
- Brass Drain Valve.
- Limited Lifetime Warranty on tank and heat exchanger.
- I=B=R Certified – These water heaters are rated by the Institute of Boiler and Radiation Manufacturers (I=B=R) to provide accurate performance data within the standards of the certification. The I=B=R rating is issued by the Hydronics Institute Division of GAMA and provides a recognized standard for proper comparison of hydronic appliances.
| Model_Number | Capacity | A. Floor to Heater Top |
B. Jacket Diameter |
C. Floor to T&P Conn. |
D. Floor to Water Conn. |
E. Floor to Floor to Boiler Return |
F. Floor to Boiler Supply |
G. Floor to Thermostat |
Aprox. Shp. Wt. |
|---|---|---|---|---|---|---|---|---|---|
| U.S.Gal. | in. | in. | in. | in. | in. | in. | in. | lbs. | |
| NDW-2-40L | 38 | 41 | 22 | 34 3/4 | 41 7/8 | 5 3/8 | 27 1/2 | 11 1/2 | 195 |
| NDW-2-50L | 48 | 46 1/4 | 22 | 40 1/4 | 47 1⁄4 | 5 3/8 | 27 1/2 | 11 1/2 | 205 |
| NDW-2-80L | 75 | 59 | 24 | 52 7/8 | 59 3/4 | 5 3/8 | 27 1/2 | 11 1/2 | 255 |
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