If you have some hot water, or the water is just not hot enough, or some other problem, see the Troubleshooting section. The guide below is for a new water heater installation where you have NO HOT WATER AT ALL.
If you have no hot water after installing a new water heater, the most likely reasons are (1) no electric power or (2) the upper heating element was burned out during installation (dry fire).
The information on this web site is supplemental to the printed instructions that came with your water heater. To reduce the risk of property damage, serious injury or death, read and follow all labels on the water heater and the safety instructions in the printed owner's manual.