Submittal Sheet

Clearances
Required Clearance from Suggested Service
Appliance Combustible Material Access Clearance
Surface inches cm inches cm
Left Side 1 2.5 1 2.5
Right Side 1 2.5 12 31
Top 1 2.5 24 61
Back 1 2.5 6 15
Closet, Front 1 2.5 6 15
Alcove, Front 1 2.5 24 61
Vent 0 0 – –
Accessories
for Field
Mounting
Waterowswitch
Low water cutoff
3" Concentric vent terminal
High & Low gas pressure
switches
2" Concentric vent terminal
Boiler pump
2" Flush-mount terminal
3" Flush-mount terminal
Propane conversion kit
Condensate neutralizer kit
BACnet gateway
LON gateway
Sizing Data
Input Output AFUE Gas Conn. Water Product Shipping
Model Size Conn. Size Weight Weight
BTU/h kW BTU/h kW inches inches lbs kg lbs kg
NT 080 80,000 23.4 74,000 21.7 95% 1/2 NPT 1 NPT 130 59 202 92
NT 105 105,000 30.8 96,000 28.1 95% 1/2 NPT 1 NPT 155 70 216 98
NT 150 150,000 44.0 138,000 40.4 95% 1/2 NPT 1 NPT 180 82 228 104
NT 210 210,000 61.5 194,000 61.5 95% 1/2 NPT 1 NPT 195 88 270 123
NOTES:
1. For other boiler ratings:
Boiler Horsepower: HP = Output Radiation Surface: EDR sq. ft. = Output
33,475 150
Vent System
Max Equivalent* Vent and Air Pipe Length
(each)
Size 2" dia / 5.1cm 3" dia / 7.6cm
080 40 ft 12.2m 100 ft 30.5m
105 40 ft 12.2m 100 ft 30.5m
150 n/a 100 ft 30.5m
210 n/a 100 ft 30.5m
Intake (air) pipe may be PVC, CPVC, ABS or galvanized pipe.
Installations in the U.S. require exhaust vent pipe that is PVC or CPVC complying
with ANSI/ASTM D1785 F441 or stainless steel complying with UL1738. Laars
suppliestherstsectionofventpipewhichis16"ofCPVCwitheachboiler.Installa-
tionsinCanadarequireexhaustventpipethatiscertiedtoULCS636.
*To calculate equivalent length, measure the linear feet of the pipe, and add 5 feet
(1.5m) for each elbow used.
Vari-prime variable speed pump
control
Color touch-screen display upgrade