So I recently had a beyond awful experience with fire. My sims house caught fire and they wouldn't extinguish it! They just stood there and the fireman just stood outside! Glitches galore were happening. I was object deleting all over the place cuz my sims were in mortal peril! Then once everything was out it would just start back up again in a random spot so my getaway was impossible. I had to close without saving which I HATE to do. So I thought of ways to keep a fire out without cheats.
PUT A SPRINKLER BY THE FIREPLACE. Ingenious. It works! I did a few trial runs with a sim. As soon as a fire starts just turn it on. The fires out in no time. It even puts out the fireplace. Idk if anyone else has found this out but I thought I'd share just in case so nobody else has to resort to no save exits.