What Size Tankless Water Heater For 3 Bathrooms?

What size tankless water heater for 3 bathrooms would I need? In my mind, I know that I want a unit that can heat the water for all three of my bathrooms, but since I live in a single house, I am limited on the amount of space we have to work with and the amount of money we have to spend. Our current heater has two tanks, but since I know that I can only have one, what size heater should I get? Here are some answers to your questions about what size tankless water heater for 3 bathrooms you will need.