12
Eternal Hybrid Water Heater Technical Specifications
GU20 (Optional)
GU26
GU28 (Optional)
GU32
501(11,12,21,22)1201
501(11,12,21,22)1261
501(11,12,21,22)1281
501(11,12,21,22)1321
Installation
Flue system
Operation
Min
Max
145,000 BTU/Hr
180,000 BTU/Hr
199,000 BTU/Hr
236,000 BTU/Hr
NG
LP
NG
LP
Min
0.9 "WC
0.9 "WC
0.5 "WC
0.5 "WC
Max
1.6" WC
2.4 "WC
1.8 "WC
2.5 "WC
105mA
131mA
107mA
126mA
CO
NOx
Flue Temp
0.1 - 12.8gpm
0.1 - 15.8gpm
0.1 - 17.5gpm
0.1 - 20.8gpm
Gas
Cold water
Hot water
T&P Valve, Flame Rod, Thermal Fuse (307F), Remaining Flame Detector, Fan RPM Detector, Freeze Protection (-
4F), Vent Blockage Detection, Thermostat Switch (194F), Thermostat Switch (221F), Ignition Prevention, GFCI
Leakage Breaker w/3A fuse, Mixing Valve, User Selectable Maximum Temperature Lock
47,500 BTU/Hr
7.0mm
5.2mm
9.0mm
6.5mm
166.1
145.6
196.2
172.9
100,102,104,106,108,110,112,114,116,122,131,140 (default),149,158,167 (15 steps)
120 Volts 60 Hz
3/4 inches NPT Female
17.3 x 33.5 x 22.8
60db
17.3 x 40.9 x 22.8
20.5 x 38.3 x 24.8
20.5 x 45.7 x 24.8
Standby - 8 watts, Maximum - 84 watts
Standby - 8 watts, Maximum - 105 watts
Water Flow Sensor w/Built-in Display
Tank Thermistor, Inlet Thermistor, Outlet Thermistor, Burner Thermistor, Air Thermistor
Simulation Feedforward and Feedback w/Electronically Controlled Mixing Valve
86%
3.8 gal
6.4 gal
Connections
Water Temperature Sensing
Orifice Size
Maximum Valve Current
Manifold Pressure
Electrical Consumption
Operating water pressure
Water Holding Capacity
Packaged Weight (lbs)
Package Dimensions (WxHxD)
Safety Devices
Model Number (CSA)
Maximum Noise Level
48db
Water Flow Sensing
Water Temperature Control
Under 100PPM
Under 55PPM
Indoor or Outdoor
Forced Exhaust Power Vent
15 to 150Psi
With or Without Remote Controls
Direct Electronic Ignition and Automatic Flame Sensing
Current Controlled Double Stage Negative Pressure Full Modulation Gas Valve
Single Orifice Fuel Injection Pre-Mixing Cylindrical Metal Fiber Infrared Burner w/Full Modulation
3.5 - 10.5 "WC
8.0 - 14 "WC
Under 185F
Unit Weight (lbs)
Gas Input
Gas Supply
Pressure
Combustion
Analysis
Temperature Settings
Thermal Efficiency
Model Name
Ignition
Type
Flow Capacity Range
Gas Valve Type
Burner System
Unit Dimensions (WxHxD)
Electrical Power Supply
T&P Valve, Flame Rod, Thermal Fuse (307F), Remaining Flame Detector, Fan RPM Detector, Freeze
Protection (-4F), Vent Blockage Detection, Thermostat Switch (194F), Thermostat Switch (221F),
Ignition Prevention, GFCI Leakage Breaker w/3A fuse, Mixing Valve, User Selectable Maximum
Temperature Lock.