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.
While solar pumps may be free you still have to leave the pump running in order for it to function boosting you electric bill by $300 to $950 a year. Gas heaters can range $300-$500 per month depending on the fuel you choose. Electric Heat Pumps are highly efficient costing owners on average $50-100 per month. We find that about 19 of 20 of our customers who install heaters choose heat pumps simply because of their dependability and low operating cost. You can even check out this nifty savings calculator created by AquaComfort here.