A person who studies the origin of the words and its meaning is called an etymologist. Etymology is a branch of linguistics. I think all these are terms are named in English language, in every developed language there is a different term for each studies.
The wisdom of using an electric heater depends on the per kilowatt cost in your region. 1  If your heater has a 1000 watt rating and your cost of electricity is $0.15/Kwh your cost to operate for one hour would be $0.15. 2  If the element is activated 10 hours out of every 24 hours your cost per day would be $1.50.
That alone could cost between $1000 and $2000. You would then have the cost of the electric water heater, the installation costs, and the added monthly expense of heating the water. Maintenance will be about the same. Electric water heaters are much more costly to operate than gas water heaters are.