Tips for the hybrid water heater. I installed one last year when I switched my nat gas appliances to electric. Be prepared for noise when it's running in efficiency mode (heat pump mode). Also consider ducting air to and from the water heater. I didn't move the water heater: the hybrid is where the gas one was. That means in the laundry room near the master bedroom. It's loud, but it's in a closet within the laundry room and I walled the closet with thick sound absorbing foam (the outer layer has the angled surface like a recording studio). That works great for reducing the noise and has the water heater near the main use -- the master bathroom -- so there's less heat loss through transport. By ducting to and from the attic I increased the throughput greatly. For most of the year I have hot air in the attic from hot Alabama weather fed into the intake to provide ample heat for the water heater to push onto the water. I vent it back to the attic to have a zero effect on air pressure in the house. I tried exporting it to the living quarters but it made a really cold zone in an otherwise controlled temp house.
As far as solar goes, the hybrid water heater is awesome. My inverter can do 9 kW continuous power. So when I have appliances running simultaneously, the hybrid water heater is rarely a factor is pushing my total load beyond 9 kW (forcing my solar inverter to pull from the grid). The same by the way with my variable speed heat pump. Even in the Alabama summer it rarely goes into full mode and pulls 4 kW because it constantly runs in the summer (keeping the house cool continuously without having to play catchup every 15 minutes or so).
I would have to use ducting because the closest is only 30x30 with exterior door. I thought about having seasonal duct switching but the reality is ducting from the hot attic in the summer will be more efficient than intake and exhaust ducting inside which I'd only do in the summer anyways. Even in the winter, the attic gets quite warm during the day as long as the sun is shining.
I was going to install the Rheem until I found out that their cost reduced Gen 5 which replaced their built-like-a-tank Gen 4 is about 65 to 70 dbm vs the Gen 4 which maxes out at 49 dbm. They finally removed the noise spec on the Gen 5 because it was wrong. You can barely hear the Gen 4 with the compressor on maximum while the Gen 5 is often claimed to be heard through the entire house. Ducting for sure reduces a lot of the noise but much of the noise is vibration that translates through the floor.
If can't find a suitable option equivalent to the Rheem Gen 4, I'll just go straight electric for a few years. The Gen 4 also had the 8" ducting collars built in while the Gen 5 requires you purchase a separate, quite expensive, duct adapter kit made out of plastic that you screw into the water heater casing. The thing that REALLY sucks about the duct adapters is that you lose about 4" of side clearance so where the Gen 4 was an easy mount my my 30x30 water closet, the Gen 5 would require specialized offset duct which will severely limit flow. I'm not even sure it would be suitable. That said, if I don't do seasonal ducting and just duct from the attic, I wouldn't need the side duct, just the top.