Yes, domestic hot-water heaters are often connected in parallel for added volume of hot water or in series for more efficient heating of the water.
In a commercial installation there could be three or more heaters in parallel for increased simultaneous volume and another in series to supply the others for pre-heating to speed recovery to a comfortable temperature.
GE hot water heaters are made by Rheem.
American Water Heaters
no, hot water heaters
One of the best electric hot water heaters on the market is Reliance Lowboy and Reliance 80 gal. The are sold at Ace Hardware. There is a web site that rates hot water heaters and that is Heater.Housekool.com They list all the top rated electric and gas hot water heaters.
Solar hot water heaters are becoming more popular as are many solar products. One can find solar water heaters on the Rheem or Velux websites as well as on Amazon.
Yes, they get very hot to the touch.
Yes, the tankless water heaters do cost more than the normal water heaters because tankless water heaters are designed to supply hot water only when needed unlike normal ones.
ging
American
The main characteristics of instant hot water heaters are heating water for the household and storing it in a tank and usually being found in basements.
"How much" as a question is quite vague. Some hot water heaters are comprised of copper only. So this now depends on the size of the hot water heater. Some hot water heaters have no copper whatsoever.
In the early 1940, these types of water heaters were very primitive though.