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.
Electric water heaters typically cost less initially than gas models, but are generally more expensive to operate. Typical costs: Conventional-storage (tank style) electric water heaters typically sell for $250-$2,000 or more from home improvement stores, plumbing supply houses or online retailers. CostHelper readers report paying $588-$1,389, with an average cost of $777, for complete installation of a 40- or 50-gallon conventional storage electric water heater.