  Built by Bosch, the Aqua Star 125 FX is the same great heater as the 125HX - but with a built in power vent. This model uses a standard plug for the power vent and electronic ignition. If you need an AquaStar and want to vent out through a side wall - then this is the heater for you! And just like the 125HX - the 125FX uses no energy when idle, the 125FX has an energy factor of .80 the average storage tank heater has an energy factor of just .59. horizontal vent terminator accessory available Vented horizontaly Only With Built in Power Vent 125FX | Endless hot water for 1 major application at a time | | |  |  |  |  |
AquaStar Model 125 Tankless Water Heaters
Technical Information about model 125 Series Water Heaters
| | Specifications | | Model | 38B | 125X & 125HX | 125FX | 125B | 125BL | 125BS | | Energy Factor | .66 | .80 | .78 | .69 | .69 | .69 | | Efficiency | 80% | 82% | 80% | 82% | 82% | 82% | | BTU/input | 40,000 | 117,000 | 125,000 | 117,000 | 117,000 | 117,000 | | Minimum Flow Rate GPM | 0.6 | 0.5 | 0.5 | 0.5 | 1.8 | 0.5 | | @ 45° rise | 1.3 GPM | 4.0 GPM | 4.0 GPM | 4.0 GPM | 4.0 GPM | 4.0 GPM | | @ 55° rise | 1.0 GPM | 3.3 GPM | 3.3 GPM | 3.3 GPM | 3.3 GPM | 3.3 GPM | | @ 65° rise | 0.9 GPM | 2.8 GPM | 2.8 GPM | 2.8 GPM | 2.8 GPM | 2.8 GPM | | @ 75° rise | 0.8 GPM | 2.4 GPM | 2.4 GPM | 2.4 GPM | 2.4 GPM | 2.4 GPM | | @ 90° rise | 0.6 GPM | 2.0 GPM | 2.0 GPM | 2.0 GPM | 2.0 GPM | 2.0 GPM | | Flue Size | 4" | 5" | 4" | 5" | 5" | 5" | | Water Inlet | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | | Gas Inlet Connection | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | 1/2" NPT | | Min. Natural Gas Line | 1/2" NPT | 3/4" NPT | 3/4" NPT | 3/4" NPT | 3/4" NPT | 3/4" NPT | | Min. LP Gas Line | 3/8" | 5/8" | 5/8" | 5/8" | 5/8" | 5/8" | | Height | 25 3/8" | 29 3/4" | 29 3/4" | 29 3/4" | 29 3/4" | 29 3/4" | | Width | 10 5/8" | 18 1/4" | 18 1/4" | 18 1/4" | 18 1/4" | 18 1/4" | | Depth | 9 1/8" | 8 3/4" | 8 3/4" | 8 3/4" | 8 3/4" | 8 3/4" | | Shipping Weight | 25 lbs | 44 lbs | 51 lbs | 44 lbs | 44 lbs | 44 lbs | | Recom. Min. Water Pressure | 18 PSI | 18 PSI | 18 PSI | 18 PSI | 18 PSI | 18 PSI | | Max. Water Pressure | 150 PSI | 150 PSI | 150 PSI | 150 PSI | 150 PSI | 150 PSI | | Min. LP Gas Pressure | 11" W.C. | 11" W.C. | 11" W.C. | 11" W.C. | 11" W.C. | 11" W.C. | | Min. Natural Gas Pressure | 7" W.C. | 7" W.C. | 7" W.C. | 7" W.C. | 7" W.C. | 7" W.C. | |
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Tank VS Tankless
Aquastar Warranty Information
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