Rheem makes a 120v-based series of heat pump water heaters now. They were specifically designed for homes with gas water heaters and not enough 240v outlets. I won’t be surprised if/when other manufacturers follow.
If you have an attached garage, you might consider having it installed there to suck up all the summer heat.
If you’re worried about peak electricity usage, you can put your water heater on a timer so it’s only active during the hours you need it. Some water heaters come with this feature built in. Modern water heaters hold heat well, like a battery. So you won’t lose much heat from the water when the power is cut. Technology Connections did a good video on this subject.
Be sure to check for city, state, and federal rebates when replacing your water heater. They can cut costs significantly.