Hot water in an immersion heater Basic knowledge: Water can be used to heat water overnight using an immersion heater, in order to benefit from the good rate electricity market. But the problem is keeping the water warm until it is used, for example for a bath or for washing dishes. Immersion heaters are used in many homes and are very effective. They insulate well from heat, as most of them have an insulating jacket which is mainly made of fiberglass wool and are coated in a bright color. This is because fiberglass wool is very thick and has many ventilation holes. It's good. Because hot air is a good conductor of heat and a poor insulator of heat, so the fewer air holes there are, the less heat is conducted. Additionally, since wool has a bright exterior color, this is also a good thing because bright colors are good heat emitters. I will be conducting my own experiment to see if other materials are good thermal insulators, by making my own mini boiler casings and testing them. Key Factors: The immersion heaters we use are cans filled with heated water. Therefore, I will also need to consider in my experiment what effects the types of materials will have on my results. For this reason I will consider the size and shape of my boxes that I will put the water in, I will also need to keep the volume the same to make it a fair test. I will boil my water at 70ËšC, for each material I test. I will also consider the type of material I am using, considering the cost of each. Goal: I also need to consider the mass and thickness of my material, because if it's too thin, my experiment won't be very effective or work very well. This can lead to bending results that I