| Residential or Commercial | Residential |  | |
| Installation Location | Outdoor Only | | |
| Exhaust Type | Frontal Exhaust | | |
| Max Flow Rate | 6.6 GPM | | |
| Flow Rate @ 50°F Rise | 4.4 GPM | | |
| Flow Rate @ 80°F Rise | 2.8 GPM | | |
| Temperature Range | 115°F - 140°F | | |
| Production Status | Active | | |
| Condensing | Yes | | |
| Minimum Activation Flow Rate | 0.5 | | |
| Water Quality | Treatment May Be Necessary | | |
| Freeze Protection | Yes | | |
| Freeze Protection Rating - Indoor Temp | -30°F | | |
| Freeze Protection Rating - Outdoor Temp | N/A | | |
| Recirculation Compatible? | Yes | | |
| New Generation Model Number | N/A | | |
| Previous Name | NRC661-OD-LP | | |
| Available Temperature Settings (with remote) | 115, 120, 125, 130, 135, 140°F | | |
| Default Temperature Setting (without remote) | 120°F | | |
| Default Temperature Program Setting Options (without remote) | 120, 130, 135, 140°F | | |
| Production Date Range | 4/2014 - Present | | |
| Min Gas Input (Btu) | 15000 | | |
| Max Gas Input (Btu) | 120000 | | |
| Height (in) | 20.5 | | |
| Width (in) | 13.8 | | |
| Depth (in) | 6.7 | | |
| Weight (lbs) | 36 | | |
| Thermal Efficiency | N/A | | |
| Energy Factor | UEF=0.89 | | |
| Afue | N/A | | |
| Quick-Connect Compatible? | No | | |
| Cold Water Connection Size (in) | 3/4 | | |
| Hot Water Connection Size (in) | 3/4 | | |
| Gas Connection Size (in) | 1/2 | | |
| Power Supply | 120 VAC (60 Hz) | | |
| Current Draw (A) | 1.52 | | |
| Exhaust Vent Diameter Requirements | N/A | | |
| Exhaust Vent Material Requirements | N/A | | |
| Max Vent Length with 1 elbow | N/A | | |
| Vent Termination Clearances to Any Building Opening (ft) | OD: Below=4’,Side=4’,or Above=1’ | | |
| Gas Supply Pressure Range | 8" - 14" WC | | |
| Min Gas Line Size | 1/2" @ 10’ | | |
| Water Pressure Rating (psi) | 15-150 | | |
| Case Clearances (in) | Top = 36", Front = 24", Sides = 6", Back = 0" | | |
| Combustion Air Requirements - using Indoor Air | N/A | | |
| Combustion Air Requirements - using Outdoor Air | N/A | | |
| Head Loss at 2 gpm | | | |
| Cold Connection Height | 2.3" | | |
| Power Consumption w/out Freeze Prevention | 42 Watts | | |
| Power Consumption w/Freeze Prevention | 139 Watts | | |
| Flow Meter Alarm | Yes, with optional remote | | |
| Service Reminder | Yes | | |
| Condensate Handling Method? | NC-1 | | |
| Noise Rating (dB) | Less than 60 dB | | |
| Tested to UL Computer Controlled Safety Standards | Yes | | |
| Flame Sensor | Yes | | |
| High Limit Switch | Yes | | |
| Lightning Protection | Yes | | |
| Overheat Cutoff Fuse | Yes | | |
| Temperature Lockout | Yes | | |
| Ignition Type | Direct Electronic | | |
| Case Material | Durable Steel Casing with Polyester Coating | | |
| Color/Finish | Beige | | |
| Flue Collar Material | PVC | | |
| Primary Heat Exchanger Material | Copper | | |
| Secondary Heat Exchanger Material | Stainless Steel | | |
| Mounting Type | Wall Hung | | |
| Package Contents | Cross Recess Head Screws, Owner’s Guide, Warranty, Installation Manual | | |
| Water Holding Capacity | 0.2 gallons | | |
| Keypad/Thermostat Display | Not included | | |
| Compatible Remote Controller Part # | RC-7651M | | |
| Isolator Valve Part # | IK-WV-200-1-xx | | |
| Freeze Protection | Yes | | |
| Freeze Protection Kit Accessory | N/A | | |
| Outdoor Vent Cap Part # | N/A | | |
| Pipe Cover Part # | PC-1S | | |
| Recess Box Part # | RB-510 | | |
| High Elevation Adjustment | Yes | | |
| Quick-Connect Cord Part # | N/A | | |
| System Controller Compatible? | No | | |
| System Controller Part # | N/A | | |
| Remote Controller Cord | Not Included | | |
| Compatible Remote Controller Cord Part # | N/A | | |
| Power Cord | N/A | | |
| |
| ENERGY STAR® Qualified | Yes | | |
| CSA | Yes [US Only] | | |
| Mobile Home | Yes | | |
| NSF | Yes | | |
| SCAQMD (20 ppm) | Yes | | |
| SCAQMD (55 ppm) | No | | |
| UPC | Yes | | |
| Energy Guide - Est. Yearly Energy Use | 136 gallons | | |
| Energy Guide - Est. Yearly Operating Cost | $328 | | |
| UPC Low Lead | Yes | | |
| ASME (HLW) | No | | |
| ASME (H) | No | | |
| ASME (NB) | No | | |
| |
| Heat Exchanger Warranty (w/out Recirculation) | 12 Years | | |
| Heat Exchanger Warranty (w/Recirculation) | 3 Years | | |
| Parts Warranty | 5 Years | | |
| Labor Warranty | 1 Year | | |
| Residential or Commercial | Residential | | |
| Installation Location | Outdoor Only | | |
| Exhaust Type | Frontal Exhaust | | |
| Max Flow Rate | 6.6 GPM | | |
| Flow Rate @ 50°F Rise | 4.4 GPM | | |
| Flow Rate @ 80°F Rise | 2.8 GPM | | |
| Temperature Range | 115°F - 140°F | | |
| Production Status | Active | | |
| Condensing | Yes | | |
| Minimum Activation Flow Rate | 0.5 | | |
| Water Quality | Treatment May Be Necessary | | |
| Freeze Protection | Yes | | |
| Freeze Protection Rating - Indoor Temp | -30°F | | |
| Freeze Protection Rating - Outdoor Temp | N/A | | |
| Recirculation Compatible? | Yes | | |
| New Generation Model Number | N/A | | |
| Previous Name | NRC661-OD-LP | | |
| Available Temperature Settings (with remote) | 115, 120, 125, 130, 135, 140°F | | |
| Default Temperature Setting (without remote) | 120°F | | |
| Default Temperature Program Setting Options (without remote) | 120, 130, 135, 140°F | | |
| Production Date Range | 4/2014 - Present | | |
| Min Gas Input (Btu) | 15000 | | |
| Max Gas Input (Btu) | 120000 | | |
| Height (in) | 20.5 | | |
| Width (in) | 13.8 | | |
| Depth (in) | 6.7 | | |
| Weight (lbs) | 36 | | |
| Thermal Efficiency | N/A | | |
| Energy Factor | UEF=0.89 | | |
| Afue | N/A | | |
| Quick-Connect Compatible? | No | | |
| Cold Water Connection Size (in) | 3/4 | | |
| Hot Water Connection Size (in) | 3/4 | | |
| Gas Connection Size (in) | 1/2 | | |
| Power Supply | 120 VAC (60 Hz) | | |
| Current Draw (A) | 1.52 | | |
| Exhaust Vent Diameter Requirements | N/A | | |
| Exhaust Vent Material Requirements | N/A | | |
| Max Vent Length with 1 elbow | N/A | | |
| Vent Termination Clearances to Any Building Opening (ft) | OD: Below=4’,Side=4’,or Above=1’ | | |
| Gas Supply Pressure Range | 8" - 14" WC | | |
| Min Gas Line Size | 1/2" @ 10’ | | |
| Water Pressure Rating (psi) | 15-150 | | |
| Case Clearances (in) | Top = 36", Front = 24", Sides = 6", Back = 0" | | |
| Combustion Air Requirements - using Indoor Air | N/A | | |
| Combustion Air Requirements - using Outdoor Air | N/A | | |
| Head Loss at 2 gpm | | | |
| Cold Connection Height | 2.3" | | |
| Power Consumption w/out Freeze Prevention | 42 Watts | | |
| Power Consumption w/Freeze Prevention | 139 Watts | | |
| Flow Meter Alarm | Yes, with optional remote | | |
| Service Reminder | Yes | | |
| Condensate Handling Method? | NC-1 | | |
| Noise Rating (dB) | Less than 60 dB | | |
| Tested to UL Computer Controlled Safety Standards | Yes | | |
| Flame Sensor | Yes | | |
| High Limit Switch | Yes | | |
| Lightning Protection | Yes | | |
| Overheat Cutoff Fuse | Yes | | |
| Temperature Lockout | Yes | | |
| Ignition Type | Direct Electronic | | |
| Case Material | Durable Steel Casing with Polyester Coating | | |
| Color/Finish | Beige | | |
| Flue Collar Material | PVC | | |
| Primary Heat Exchanger Material | Copper | | |
| Secondary Heat Exchanger Material | Stainless Steel | | |
| Mounting Type | Wall Hung | | |
| Package Contents | Cross Recess Head Screws, Owner’s Guide, Warranty, Installation Manual | | |
| Water Holding Capacity | 0.2 gallons | | |
| Keypad/Thermostat Display | Not included | | |
| Compatible Remote Controller Part # | RC-7651M | | |
| Isolator Valve Part # | IK-WV-200-1-xx | | |
| Freeze Protection | Yes | | |
| Freeze Protection Kit Accessory | N/A | | |
| Outdoor Vent Cap Part # | N/A | | |
| Pipe Cover Part # | PC-1S | | |
| Recess Box Part # | RB-510 | | |
| High Elevation Adjustment | Yes | | |
| Quick-Connect Cord Part # | N/A | | |
| System Controller Compatible? | No | | |
| System Controller Part # | N/A | | |
| Remote Controller Cord | Not Included | | |
| Compatible Remote Controller Cord Part # | N/A | | |
| Power Cord | N/A | | |
| |
| ENERGY STAR® Qualified | Yes | | |
| CSA | Yes [US Only] | | |
| Mobile Home | Yes | | |
| NSF | Yes | | |
| SCAQMD (20 ppm) | Yes | | |
| SCAQMD (55 ppm) | No | | |
| UPC | Yes | | |
| Energy Guide - Est. Yearly Energy Use | 136 gallons | | |
| Energy Guide - Est. Yearly Operating Cost | $328 | | |
| UPC Low Lead | Yes | | |
| ASME (HLW) | No | | |
| ASME (H) | No | | |
| ASME (NB) | No | | |
| |
| Heat Exchanger Warranty (w/out Recirculation) | 12 Years | | |
| Heat Exchanger Warranty (w/Recirculation) | 3 Years | | |
| Parts Warranty | 5 Years | | |
| Labor Warranty | 1 Year | | |
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