If you rent a house, would you buy appliances?

I have rented a house for several months, but the water heater has broken twice while I was taking a shower. This is so disturbing and make me frustrating. I have to ask my boss to leave everytime and I don't get paid that day. 

The landlord was an old woman, she is very stingy and mean, when I called her to tell her that she needs to find someone to repair the water heaters she would always say first "You people are so annoying" (你这个人怎么这么烦). It's making me uncomfortable and angry, I mean if the appliances like refrigerator, air conditioner, water heater have always been good, why would I need you to find someone to fix them, it proves the machine is bad or aging since I have rented the house. It is unreasonable.

Undergo these things, I consider if buy a new one, these things that make me upset would not happen. But another thought comes to mind, this is a rented house, if I buy these home appliances, when I move to another house, what will be happen and what should I do. After all, changing dwelling places is not easy :(

If you were me, what would you do?
把这些遇到的不开心的事情写下说出来，心里舒服一点了，同时也希望好心的你能帮我改改英文，谢谢:)