Eternal GU120 is the affordable and flexible alternative to traditional tank water heaters in retrofit applications. With the hybrid, you get endless hot water with minimal pressure drop and 96% thermal efficiency. Its lightweight compact design, 1/2” gas line capability, top mounted water connections, and PVC venting allows for easy installation in any home. The GU120 also comes with a 15 year residential no leak warranty.
The GU120 can run up to two applications endlessly! With
Eternal’s patented hybrid technology, you don’t have to give
up water pressure, worry about cold water sandwiching, or
plan when to shower in your home.
Eternal is compatible with most recirculation systems, whether
it’s a dedicated return line or under-the-sink retrofit pump.
The built-in reserve tank within the heat exchanger makes
instant hot water possible. Optional feature. Consult your
authorized Eternal dealer.
| Model | GU120* | |
| Thermal Efficiency / Energy Factor | 96% NG / 97% LP / 0.94 Energy Factor | |
| Installation | Indoor / Outdoor / Wall Mount / Floor Standing | |
| Flue System | Forced Exhaust Power or Direct Vent | |
| Vent Run | 3” PVC | Up to 100ft, 6 Elbows Max, 5ft Deduction Per Elbow |
| Condensate Discharge | Low / Med / High Fire | 0.5GPH / 1.1GPH / 1.75GPH |
| Condensate pH Level | 4 pH | |
| Gas Type | Pre-set for NG / LP Conversion Kit Included | |
| Unit Connections | Gas | 1/2” Female NPT |
| Water | 3/4” Female NPT | |
| Electricity | Dedicated 120VAC, 60Hz w/3 Pronged Power Cord | |
| Gas Input Rate | Min / Max | 18,000 BTU/Hr / 120,000BTU/Hr |
| Gas Supply Pressure | NG / LP | 3.5”WC to 10.5”WC / 8”WC to 14”WC |
| Ignition System | Direct Electronic Ignition w/Automatic Flame Sensing | |
| Burner System | Single Orifice Premixed Fuel Injection Metal Fiber Infrared | |
| Gas Valve System | Dual Stage Negative Pressure Full Modulation Air Ratio | |
| Internal Piping Material | PPS and Copper | |
| Reserve Tank | Under 2 Gallons | |
| Electrical Consumption | Standby 8w, Maximum 45w | |
| Maximum Noise Level | Under 35dB | |
| GPM Capacity Range | 0.1 to 12 GPM | |
| Temperature Sensing | Tank, Cold Inlet, Hot Outlet, Air Inlet Thermistors | |
| Temperature Control | Simulation Feed Forward and Feed Back w/ Electronically Controlled Mixing Valve | |
| Flow Sensing | Dual Flow Sensors w/Built-in GPM Monitor | |
| Temperature Settings Range | 100°F to 140°F ( 5°F interval/ 9 steps), Factory default : 140°F | |
| Unit Dimensions (WxHxD) | 16.9” x 29.1” x 13.8” | |
| Unit Weight | 74.5lbs | |
| Safety Devices | T&P Valve, Flame Rod, Thermal Fuse (306°F), Remaining Flame Detection, Fan RPM Check, Freeze Protection (-40°F), Vent Blockage Detection, Thermostat Switches (149°F / 194°F), Gas Valve Current Leak Detection, Ignition Prevention, Dipswitch Temperature Lock, GFCI w/2 x 5A Fuses. | |
| Accessories | Outdoor Vent Cap Assembly, 3” Horizontal Terminator, Concentric Venting Kit, Condensate Neutralizer Kit, Water Heater Stand | |
| * GU120 is for single or dual unit applications with no multi control unit. | ||
Eternal has a national network of contractors, distributors, and sales representatives that are ready to assist you. Please select one of our Factory Authorized Service Trained (F.A.S.T.) or Factory Authorized Contractor Trained (F.A.C.T.) professionals. FAST and FACT contractors have been trained by our company to install and service Eternal hybrid water heaters. Enter your zip code to find one near you.
Zip/Postal Code
| GU120 Eternal Hybrid Water Heater | |
| Local State and Utility Rebates & Promotions* |
|
Consult the Eternal Rebate Center for additional savings.
*See your authorized dealer for more details. Tax credit may vary. Consult your tax professional.
