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Your Domestic Hot Water heater has an invalid Recovery Efficiency. Select the Libraries button on the bottom left. In the list that appears above, select the DHW/Boiler library. You will see your water heater listed in the library.
Verify that you have the correct type of water heater selected (Gas Fired, Electric, Heat Pump, etc).
Now verify that you have a valid Recovery Efficiency input for the water heater. EnergyPro will list the valid range of Recovery Efficiencies that you must conform to.
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