I have a 3000 sq ft house on 3 levels. We have 3 full bathrooms and run out of hot water. No Gas available, everything is electric and I live in VA. Can I run a small, 3GPM, Tankless in series with a small, 15-20 Gal Tank water heater so we have an endless supply of hot water on demand? A whole house Electric Tankless Water Heater would require a new panel and wiring at a cost that is prohibitive. How about another "Hybrid" type system?
I appreciate your insights.