I figured out the answer to my own question. Basically it came down to entering the amount on the correct line. After the following sequence of steps/answers:
Federal Taxes > Deductions & Credits > All Tax Breaks > Your Home > Home Energy Credits
Yes, I made energy-efficient improvements or have a carry forward.
No, the home is mine.
Yes, my home is in the U.S.
Yes, the improvements were made to my main home.
No, the improvements weren't related to the construction of my main home.
- I was then presented with these options under which to enter the amount spent on the qualifying hot water heater and its installation:
Exterior Doors
Exterior Windows
Metal or Asphalt Roof
Insulation Material or System
Energy-Efficient Building Property
Advanced Main Air Circulating Fan Used in a Natural Gas,
Propane, or Oil Furnace
Furnaces and hot water boilers powered by
natural gas, propane or oil Learn More
I had initially selected Furnaces[...] as the category for the expense, but energy-efficient hot wat...
