Advantage - Very safe, you can cover it with damp clothes and use it as a dryer. It is heavy but portable, and there is no danger of fire or fumes. Disadvantage - It is relatively inefficient and takes a long time until the oil heats up enough. Best used in a children's room. Gas Different sizes.
Most today have a safety switch which cuts off the gas flow the moment the flame goes out.
Heats quickly and with great strength which is good for large areas. Most models heat some kind of brick which doesn't lose heat immediately upon being shut off. Almost all have thermostat control. Hoses can crack and must be checked periodically. You must have a window open due to carbon monoxide fumes and the burning of oxygen.