Regardless of how good of a heater you invest your money in, the parts of the heater have a maximum lifespan. After that, they start to fail. So, eventually, you will have to replace them. When you are choosing replacement parts for your heater, there are some vital things to consider. The most important one of them is that the electrical rating of the part should be compatible with the rest of the heater. Secondly, the output of the heating parts should be suitable for the heat output of the heater. Only then will the heater function properly.