Stainless Steel Single-Wall Indirect Water Heaters

        •  Stainless Steel Single-WallStainless Steel Heat Exchanger – Single-wall 1″ O.D. stainless steel coil. Maximum supply temperature from the boiler must not exceed 240°F.
        • Stainless Steel Tank and Heat Exchanger – Made from chromium molybdenum – titanium ferritic 444 stainless steel alloy.
        • 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 supply and boiler return.
        • 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 dielectric fittings extend water heater life and eases installation (1″ NPT on NSS-120-L).
        • T&P Relief Valve – Included.
        • Steel Jacket
        • Brass Drain/Return Valve.
        • 5 Year Limited Warranty on tank and heat exchanger.
        • AHRI Certified – These water heaters are rated by the Air-Conditioning, Heating and Refrigeration institute to
          provide accurate performance data within the standards of the certification.  This provides a recognized standard
          for proper comparison of hydronic appliances.

Specifications

Model Number Capacity A.
Ht. Floor to Heater Top
B.
Jacket Dia.
C.
Ht. Floor to
T&P Conn.
D.
Ht. Floor to
Water Conn.
E.
Ht. Floor to
Cold Water
Conn.
F.
Ht. Floor to
Exchanger
Outlet
G.
Ht. Floor to
Exchanger
Inlet
H.
Ht. Floor
to
Aquastat
Aprox.
Ship Wt.
U.S. Gal. in. in. in. in. in. in. in. in. Lbs.
NSS-30-L 29 31 5/8 24 22 1/2 32 1/2 32 1/2 10 22 5/8 16 1/2 75
NSS-40-L 38 38 ¼ 24 29 1/8 38 7/8 38 7/8 10 24 3/4 18 3/4 91
NSS-50-L 50 48 24 39 3/4 48 7/8 48 7/8 10 29 1/4 19 1/2 103
NSS-75-L 73 65 5/8 24 56 1/2 66 1/4 66 1/4 10 33 5/8 19 1/9 142
NSS-120-L 111 68 3/8 30 1/4 63 1/2 53 2 11 39 1/8 30 1/2 217

AHRI Certified Water Heater Ratings
Model Number First Hour Delivery

Rating (Gal/ Hr.)

Continuous Draw @ 135 F (Gal/ Hr.) Stand-by Heat Loss Rating (F/ Hr.) Minimum Heat Required for Ratings (BTU/ Hr.) Minimum Heat Source Flow Rate (Gal/ min)
NSS-30-L 179 160 0.8 105,000 14.0
NSS-40-L 237 209 0.6 135,000 14.0
NSS-50-L 269 229 0.5 145,000 14.0
NSS-75-L 367 307 0.4 193,000 14.0
NSS-120-L 409  319 0.3 199,000 9.0