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Specications
• Specications may be changed without prior notice.
• The capacity may differ slightly, depending on the water pressure,
water supply, piping conditions, and water temperature.
Specication
NRC663-FSV
Indoor Wall Mounted
Direct Ignition
15-150 psi
0.5 GPM (2 L/min.)
27.2" (690mm) x 18.3" (464mm) x 9.4" (240mm)
50 lbs.
0.2 Gallon (0.9 L)
NPT 3/4"
NPT 3/4”
NPT 1/2”
1/2” Threaded
120 VAC (60Hz)
NG : 83 W LP : 80 W
Freeze Prevention 129 W
Zincied Steel Plate/Polyester Coating
Stainless Steel
Copper Sheeting, Copper Tubing
Stainless Steel Sheeting, Stainless Steel Tubing
Flame Rod, Thermal Fuse, Lightning Protection Device (ZNR),
Overheat Prevention Device, Freezing Prevention Device,
Fan Rotation Detector
Anchoring Screw
Specications
Performance
Item
Model Name
Type
Ignition
Operating Pressure
Minimum Flow Rate
Dimensions (Height) x (Width) x (Depth)
Weight
Water Holding Capacity
Accessories
Installation
Air Supply/Exhaust
Connection Sizes
Power Supply
Materials
Water Inlet
Hot Water Outlet
Gas Inlet
Condensate Drain
Safety Devices
Item
Gas
Consumption
Maximum Hot Water Capacity
Capacity Range
*Depends on the condition
Temperature Settings
(Using the optional
remote controller)
Default Temperature Options
NG
LP
45°F (25°C) Rise
Maximum Performance
120,000 btuh
120,000 btuh
Minimum Performance
15,000 btuh
15,000 btuh
4.9 GPM (18.7 L/min.)
0.5-6.6 GPM (2-25.0 L/min.)
115-140°F (In 5°F intervals) (6 Options)
Casing
Flue Collar
Primary Heat Exchanger
Secondary Heat Exchanger
Supply
Consumption
120°F (50°C), 130°F (55°C), 135°F (57°C), 140°F (60°C)
(Original is 120°F (50°C))
°F Mode:
°C Mode:
46, 47, 48, 50, 55, 60°C (6 Options)
Power Vented
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