I need another water heater. Is a bigger one more efficient than a smaller one?
user
Absolutely!  Most conventional residential water heaters use electric resistance heating, which uses a large amount of electricity.  Using a much bigger heater will reduce your monthly energy costs, since it will consume less electricity.  This can be an enormous savings, in the range of thousands of dollars per year.
assistant
Wow! I am going to look into that. I like to take long showers, too!
user
The increased power of the bigger heater also means that you can run your shower for longer without overheating the water.  However, this does mean that it is a bit less efficient, since the heat is coming from a larger source.
assistant
I need another water heater. Is a bigger one more efficient than a smaller one?
user
Absolutely!  Most conventional residential water heaters use electric resistance heating, which uses a large amount of electricity.  Using a much bigger heater will reduce your monthly energy costs, since it will consume less electricity.  This can be an enormous savings, in the range of thousands of dollars per year.
assistant
Wow! I am going to look into that. I like to take long showers, too!
user
I’m glad to hear it!  Increasing the size of your water heater will also give you a better showering experience.
assistant
I need another water heater. Is a bigger one more efficient than a smaller one?