Bosch AquaStar Model 125 Series Tankless Water Heaters
Technical Information about model 125 Series Water Heaters


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Specifications
Model 1000P 1600H 125FX 125B/125BS 125BL 125BO
Energy Factor
(Natural Gas)
.66 .80 .78 .69 .69 .69
Energy Factor
(Propane Gas)
.66 .84 .81 .79 .79 .79
Efficiency 80% 82% 82% 82% 82% 80%
BTU/input 74,900 117,000 125,000 117,000 117,000 117,000
Minimum Flow Rate GPM 0.5 0.5 0.5 0.5 1.8 0.5
@ 45° rise 2.6 GPM 4.3 GPM 4.0 GPM 4.0 GPM 4.0 GPM 4.2 GPM
@ 55° rise 2.1 GPM 3.4 GPM 3.6 GPM 3.3 GPM 3.3 GPM 3.3 GPM
@ 65° rise 1.7 GPM 2.9 GPM 3.1 GPM 2.8 GPM 2.8 GPM 2.8 GPM
@ 75° rise 1.5 GPM 2.4 GPM 2.7 GPM 2.4 GPM 2.4 GPM 2.4 GPM
@ 90° rise 1.3 GPM 2.1 GPM 2.3 GPM 2.0 GPM 2.0 GPM 2.1 GPM
Flue Size 4" 5" 4" 5" 5" n/a
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 3/4" NPT
Min. Natural Gas Line 1/2" NPT 3/4" NPT 3/4" NPT 3/4" NPT 3/4" NPT 1/2" NPT
Min. LP Gas Line 3/8" 5/8" 5/8" 5/8" 5/8" 3/4"
Height 28 5/8" 25 3/4" 29 3/4" 29 3/4" 29 3/4" 36 3/4"
Width 12 1/4" 16 3/4" 18 1/4" 18 1/4" 18 1/4" 18 1/4"
Depth 8 1/2" 8 1/2" 8 3/4" 8 3/4" 8 3/4" 10 1/2"
Shipping Weight 25 lbs 35 lbs 51 lbs 44 lbs 44 lbs 57 lbs
Recom. Min. Water Pressure 30 PSI 18 PSI 18 PSI 18 PSI 18 PSI 30 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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