YES, -or else they would be useless !
Oil heaters can burn badly if touched when hot. Obviously. oil is dangerous if it gets into any wounds, eyes, or the mouth when filling them.
Yes, they get very hot to the touch.
Ceramic heaters are some of the newest heaters to hit the market; and they are not hot to the touch. They are a type of convection heater that uses ceramic plates and aluminun baffles. When the ceramic heats up, the aluminun absorbes the heat and a small fan blows the heat into the room. The plastic casing on the outside keeps the heater cool to the touch.
I am assuming you mean an enclosed heater. Oil stay hot longer & does not rust.
GE hot water heaters are made by Rheem.
Generally most hot tub heaters reach a maximum of 104 degrees Fahrenheit. Hot tub heaters are regulated to prevent excessive heat from harming our bodies. The following is a website that has a lot of detail about hot tub heaters. http://www.ehow.com/about_5031765_temperature-should-hot-tub.html
Water Heater Hot Water Heater Hot Water Heater Installation Electric Hot Water Heaters Gas Hot Water Heaters
Cool touch heaters are made of ceramic and aree very safe, while mica radiators are hot to the touch but produce much more heat.
In a hot cup, conduction is the transfer of heat from the hot liquid to the cup itself. The heat is conducted through the material of the cup, warming up the surface that we touch. This is why the cup feels warm to the touch when filled with a hot liquid.
Firey, Hot, bright, warm radiant, shiney. Firey, Hot, bright, warm radiant, shiney.
American Water Heaters
Radiant heaters supply heat directly to the ceiling, floor or walls of a home. They use radiant heat transfer, which is heat moving directly from the hot surface to the objects or people in the room. This is the same effect as when you can feel the heat of stove burner from across the room. This type of heating is more energy efficient than forced-air heat because no heat is lost in the duct work. Since there is no moving air, it is better for people with allergies.