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Comparison Chart:

Model Energy factor : Thermal Efficiency : Input : Minimum flow rate : @ 50° F rise : @ 55° F rise : @ 65° F rise : @ 75° F rise : @ 90° F rise : Flue size : Water inlet : Gas inlet connection : Height : Width : Depth : Shipping weight :
Model - AQ38 .64 80% 20,000 - 40,000 BTU’s/Hr 0.6 GPM 1.2 GPM 1.0 GPM 0.9 GPM 0.8 GPM 0.6 GPM 4" .5" NPT .5" NPT 25.4" 10.6" 9.1" 18 lbs
Model GWH260PN-LP .64 78% 30,735-74,900 BTU/Hr 0.5 GPM 2.6 GPM 2.1 GPM 1.7 GPM 1.5 GPM 1.3 GPM 4" .5 NPT .5 NPT 22.83" 12.20" 8.66" 26lbs
Model - GWH425EF .78 82% 125,000 BTU’s/Hr 0.5 GPM 3.6 GPM 3.3 GPM 2.8 GPM 2.4 GPM 2.0 GPM 4" .5" NPT .5" NPT 29.75" 18.25" 8.75" 52lbs
Model - GWH425HN .80 83% 117,000 BTU’s/Hr 0.5 GPM 3.6 GPM 3.3 GPM 2.8 GPM 2.4 GPM 2.0 GPM 5" .5" NPT .5" NPT 29.75" 18.25" 8.75" 44 lbs

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