Those cheap plastic coffee machines actually are pretty poor, and tend to break fast -- planned obsolescence at its finest. I recommend going a step up and buying something like a Rancilio Silva [1]. All metal, has replaceable, serviceable parts, has a good community of tweakers who document mods for things like temperature control, lasts practically for ever.

[1] https://www.amazon.com/Rancilio-Espresso-Machine-Stainless-1...