Brochure

52
Heavy-Duty Electric
Dura-Power
™
Hot Water
NW Boiler Models
Designed for use as a hot water
boiler for space heating applications
ASME Code Construction

All vessels manufactured to applicable ASME code

Vessels with maximum working pressure of 160 PSI or
less (standard design is for 125 PSI) at 240ºF maximum
temperature bear the “H” symbol
Incoloy Immersion Heaters

Heavy-duty medium-watt density elements
(3 per immersion heater)

Incoloy sheathing provides excellent protection
against oxidation and scaling

Inputs range from 450 kW to 6,000 kW
Control And Power Circuit Fusing

Meets National Electrical Code

100,000A I.C. cartridge-type fuses protect all elements
and contactors
Pilot Switch And Light

Permits manual starting and stopping of heater by
interrupting power to the control circuit

Pilot light indicates when control circuit is energized
Heavy-Duty UL-Rated Magnetic Contactors
Rated For 100,000
Low Water Cutoff

Probe type, electric low water cutoff prevent energizing
of elements in the even of low water condition
120V Control Circuit

Powered by fused transformer
Modulating Step Control

Solid state modulating step control modulates heat
input to match load
1-Year Limited Tank Warranty
MODEL GAL. KILO- INLET BOILER
NO. CAP. WATTS HT.** WIDTH DEPTH AND DRAIN
MAXIMUM OUTLET*
NW-37 37 180 42 32 30 31
NW-60 60 300 57 32 30 31
NW-96 96 480 69-1/2 36 38 4 1-1/4
NW-150 150 720 69-1/2 54 44 5 1-1/2
NW-220 220 1140 71 60 50 5 1-1/2
NW-334 334 1740 99 60 50 62
NW-400 400 2100 90-1/2 66 56 82
NW-500 500 2580 90-1/2 72 62 82
NW-670 670 3300 96-1/2 78 68 82
All dimensions in inches
NOTE: For boilers 3400 kW to 6000 kW, consult factory.
*All fittings under 4˝ will be threaded type. All fittings 4˝ and larger will be flanged.
**Where overall height is a problem, a larger diameter vessel with a reduced height may be furnished.
Optional Goldenrod
®
24-carat gold-plated
elements resist lime
scale adhesion and
sheath temperatures
up to 1500º F.
AOSCA80000 R Oct 2011 Com Catalog:108078_ResidentialFul#7A635.qxd 10/28/11 5:52 PM Page 52