The last couple of years we’ve had it serviced, the men have gone “Eh, you might want to start saving, it’s starting to go” and we’ve had people out mid year to look at it too... this year during its annual service the chap goes “I would not trust that to get you through the winter” so we were like “yep, time for a new one!” Definitely the time of the year to get it done, I do not want to be without heat in the middle of December!