Entering a Qualified Energy Property cost of a Water Heater diy labor and hydronic heating?.

1: When entering the cost of the water heater it says to include Labor. What can I put for Labor when I had to install the unit myself ? Do I just use the labor rates from the outrageous quotes I had received?

2: The water heater is also for my house heating - is there any way I can get a  second credit for this unit?