It is very important to know the material from which the tank is made. Stainless steel is considered durable and reliable, but there will be a lot of noise from it, and the price is not acceptable for everyone than the same cars with a plastic tank. Materials such as Polins, Carborer, Polypex are quiet in use, retain heat and save electricity. Internal drums have a short period of use, but at a price they differ significantly from machines with a stainless steel tank.
