Residential Single-Wall

Standard features:
  • Heat Exchanger-Single-Wall 1½” O.D. glass coated (Ultonium® Glass Lining with Microban®) carbon steel coil. The coil has a heat transfer area of 14.2 sq. ft. and a stored water volume of 2.7 Gal. Maximum supply temperature from the boiler must not exceed 250°F.
  • Factory Installed Sparge Tube System-Cold water inlet sediment reducing device helps prevent 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.
  • Immersed Adjustable Honeywell Aquastat-Fast acting immersion aquastat for automatic temperature control (adjustable from 80°F to 160°F)
  • Supply and Return Connections-1″ NPT female connections are located on the front for both the boiler collector supply and return.
  • 2″ Non-CFC Foam Insulation-Covers the side and top of tank, reducing the amount of heat loss. This results in less energy consumption, improved operation efficiencies and jacket rigidity.
  • Potable Water Connections-3/4″ NPT factory installed true dielectric fittings extend water heater life and eases installation.
  • Three Protective Aluminum Anode Rods-Provide added protection against corrosion for long trouble-free service.
  • Steel Tank-Heavy gauge steel automatically formed, rolled and welded to assure a continuous seam for glass lining.
  • T&P Relief Valve-Included.
  • 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 provide a recognized standard for proper comparison of hydronic appliances.
Residential Single Wall Indirect Water Heaters
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Spec Sheet

Water Heater Dimensions (Inches)

Model A B C D E F
NSW-2-30-L 22 335⁄8 281⁄4 343⁄8 53⁄8 271⁄2
NSW-2-40-RL 22 411⁄8 343⁄8 417⁄8 53⁄8 271⁄2
NSW-2-50-RL 22 461⁄4 401⁄8 47 53⁄8 271⁄2
NSW-2-65-L 22 591⁄4 531⁄8 60 53⁄8 271⁄2
NSW-2-80-L 24 59 527⁄8 593⁄4 53⁄8 271⁄2
NSW-2-120-L 281⁄4 621⁄2 553⁄4 631⁄4 63⁄8 281⁄2

Notes: All Ratings based on 200 F boiler water temperature and 50 F potable water inlet temperature.

DOE Water Heater Performance

Model Maximum First Hour Rating (Gal/Hr) @ Continous Draw Rating (Gal/ Min) @ Approximate Boiler Output Needed for Ratings (BTU/Hr)
140°F 115°F 140°F 115°F
NSW-2-30-L 226 342 3.3 5.2 180,000
NSW-2-40-RL 235 351 3.3 5.2 180,000
NSW-2-50-RL 244 360 3.3 5.2 180,000
NSW-2-65-L 258 374 3.3 5.2 180,000
NSW-2-80-L 272 388 3.3 5.2 180,000
NSW-2-120-L 309 425 3.3 5.2 180,000

AHRI Water Heater Performance

Model First Hour
Delivery
@ 135 F (Gal)		 Continuous
Draw Rating
@135 F (Gal/Hr.)		 Standby
Heat Loss
Rating (F/Hr.)		 Minimum
Output Rate
of Heat Source
(BTU/Hr.)		 Minimum
Heat Source
Flow Rate (Gal/min.)
NSW-2-30-L 197 180 1.2 120,000 13.7
NSW-2-40-RL 205 180 1.1 120,000 13.7
NSW-2-50-RL 210 180 0.9 120,000 13.7
NSW-2-65-L 215 175 0.7 115,000 13.7
NSW-2-80-L 235 175 0.6 115,000 13.7
NSW-2-120-L 265 175 0.4 115,000 13.7

Water Heater Capacities

Model Tank Capacity (Gal) Coil Volume (Gal) Dry Weight (Lbs) Wet Weight (Lbs)
NSW-2-30-L 30 2.6 140 404
NSW-2-40-RL 40 2.6 168 514
NSW-2-50-RL 50 2.6 196 623
NSW-2-65-L 60 2.6 196 704
NSW-2-80-L 75 2.6 224 861
NSW-2-120-L 116 2.6 355 1324
Model_Number Capacity A.
Height
Floor to Heater Top		 B.Jacket Diameter C.
Height Floor to T&P Conn.		 D.
Height Floor to Water Conn.		 E.
Height Floor to Exchanger Outlet		 F.
Height Floor to Exchanger Inlet		 G.
Height Floor to Aquastat		 Approx. Shipping Weight
U.S.Gal. in. in. in. in. in. in. in. lbs.
NSW-2-30-L 30 33 5/8 22 28 3/4 34 3/8 53/8 27 1/2 11 1/2 140
NSW-2-40-L 40 36 24 29 3/4 36 3/4 5 3/8 27 1/2 11 1/2 168
NSW-2-50-L 50 36 26 29 3/4 36 3/4 5 3/8 27 1/2 11 1/2 196
NSW-2-65-L 60 59 1/4 22 53 1/8 60 5 3/8 27 1/2 11 1/2 196
NSW-2-80-L 75 59 24 52 7/8 59 3/4 5 3/8 27 1/2 11 1/2 224
NSW-2-120-L 116 62 1/2 28 1/4 55 3/4 63 1/4 6 3/8 28 1/4 11 1/2 355
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