Abstract: There are a lot of negative factors affecting the operation of Internal Combustion Engines (ICE) in the cold weather conditions, the first and main of which is a low temperature. In these conditions to ensure reliable start and operation of ICE the preheating is required. So, an additional source of thermal energy is needed. At the same time, during the operation of the ICE a significant amount of heat energy is dissipated and lost without usage. To provide reliable start and to increase durability of the ICE without additional energy sources are possible if accumulate and use ICE heat energy for preheating of ICE. Thus, we get a significant economic effect.