iQ251 Wall-hung Commercial Tankless System

Type Indoor/Outdoor, Commercial, Wall Hung, Tankless, Fully Condensing, Tankless On-Demand Water Heater

Fuel Preset for NG / LP convertible
Minimum / Maximum Input (BTU/hr) 30,000 / 251,000
Maximum Output (BTU/hr) 240,960
Thermal Efficiency 96%
Dimensions H X W X D (Inches) 26.2 X 17.7 X 15 (3.9 CU. FT)
Weight (LBS) 90 LBS
Water Inlet / Outlet Connection 3/4” NPT
Gas Inlet Connection 3/4” NPT
Minimum Flow Rate for Activation 0.6 GPM
Ignition Electronic Spark Ignition
Venting Type Direct Vent (2 pipe – intake & exhaust), Power Vent (1 pipe – exhaust only)
Venting Materials Sch. 40 PVC, Sch. 40 CPVC, Polypropylene, Stainless Steel (AL29-4C)
Max 3” Vent Length – Single Pipe / Power Vent 130 ft, deduct 5 ft per 90° elbow
Max 3” Vent Length – Two Pipe / Direct Vent 65 ft, deduct 5 ft per 90° elbow
Common Venting Yes
Installation Location Ambient Temperature 40°F – 130°F
Safety Flame Rod, Thermal Fuse, Overheat Prevention Device, Fan Speed Monitor, Flue Temperature
Monitor, Blocked Vent Detector, Water Shut-Off Valve, 2X10A Fuse, Dual Flame Sensing, Flue Damper
Water Pressure Min / Max (PSI) 30 / 160
NG/LP – Minimum Static Gas Pressure 1/2” (non-corrugated, black iron) 6”
NG/LP – Minimum Static Gas Pressure 3/4” (non-corrugated, black iron) 2.5”
NG/LP – Maximum Static Gas Pressure 14”
Gas Pressure for Adjustments 8” for NG, 11” for LP
Electrical 120V AC, 60 Hz
Power Consumption 500W (Max 4.2 Amps), 8W (Standby)