@oshizu --- There is a "self-repairing" upgrade, which is available if a Sim has at least a level 5 handiness skill. However, I read that it can still catch on fire sometimes. That hasn't happened to me yet because I've only used it tonight so far.
I wasn't expecting to be able to get the fitness pack today, but I was finally able to get it. The Parenthood pack is so awesome! I'm enjoying the fitness pack a lot though.
All of the Adults in my Sullivan family have a level 10 in so many skills --- including handiness and fitness, so that will help.