It is possible that you are not getting the credit for the heat pump due to a lack of tax liability. The heat pump water heater credit is part of the Energy Efficient Home Improvement Credit. This is a nonrefundable credit that cannot be carried forward. Which means it is a use it or lose it credit. So if you do not have a tax liability in the tax year you are filing for on line 16 of your form 1040 for it to offset, or you already have enough other non-refundable credits to offset it, you will not be able to claim this credit.
The solar credit on the other hand is able to be carried forward, so whether or not you have enough tax liability, you would be able to claim this credit if you other wise qualify for 2025. It is very possible that this credit wiped out your tax liability so you would not have any tax left to use for the heat pump.
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