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Tankless water heaters have been around about 30 years. I believe they may have first been used on European trains.
The Water Frame or Spinning Frame was first used around 1769/70.
Used oil heaters can be purchased from Central Ohio Heaters, Northern Tool, Lanair, Yakaz For Sale, Firelake Manufacturing, Kutrie Waste Oil Heaters, Oil Burners, and Clean Burn.
Solar water heaters do this, They can be simple affairs mounted on a house roof, or on a larger scale mirrors can be used to capture radiation and focus it on a heat absorber.
Paraffin heaters, also known as kerosene heaters, are used as a source of heat for a space. They are mainly used at times of power outages and other such emergencies.
Corona kerosene heaters are used for heating up a stove and acting as small lanterns or heaters. They could potentially be used in cases where your normal heater is burned out.
It is unlikley that you couldconfigure many airconditioners to be used as heaters.
Devco industrial heaters are mainly used, as the name already says, for industrial processing. They offer heaters such as band heaters, steam generators, cartridge heaters and temperature sensors.
Yes, from personal experiences I can inform you that Sears does in fact sell used water heaters. Sears' used water heaters are sold in fairly good condition and at a very affordable price.
Gas heaters that are not part of a central heating system are considered space heaters and can be dangerous as you have heard. In addition, gas heaters that are improperly used or functioning add the risk of carbon monoxide poisoning, especially if they are not vented to the outdoors. Safety precautions are a must with these heaters.
Radiation is all around us and comes from the sun. Humans have found ways to make some of this radiation. Radiation has been used successfully to treat cancers and is also used in manufacturing, agriculture and in scientific research. Too much radiation is harmful and can also cause some cancers. Overall, radiation produces more benefit than hazard when used properly.
Tubular heaters are not specifically made for the purpose of heating oil. There are tubular heaters that use oil as a means of heating but they are not made to heat oil.