My tankless isn't working, PG&E says it's an ignitor problem, Mr. Rooter says it's a control panel problem and that I should just replace it. He told me I should invest in the new one because it's 7 years old and it's outside, so he's surprised it's lasted this long. But when I looked up the average lifespan of tankless' it came back as 20 years. Is mine worse because it's outside? I believe it's a gas model since it has a gas switch that PG&E switched off because it was just leaking gas trying to ignite. Should I just replace it? Or should I see if I can get someone else to look at it and fix it?