How am I going to fix the heat exchanger

My partner and I have an aged gas oil furnace that is almost 15 years old.

I remember when the people I was with and I bought the gas oil furnace.

It was the middle of a cold Wintertide season, and my partner and I thought the people I was with and I ran out of fuel. It started to get honestly cold in the middle of the night and my first thought was that the pilot light went out. Unfortunately, pilot light was not the problem. After carefully checking through the oil furnace, I felt that the concern was an issue with the heat exchanger. This was not an issue that I can fix at home, and I knew that I would have to contact the heating repair dealer. When the people I was with and I woke up in the day, my partner called the heating business to request an appointment time… Luckily, they had an appointment for the same day. My partner and I had to wait until the afternoon to see the heating repair guy; He investigated the concern for several hours before he came to tell us that the heat exchanger could not be fixed. He recommended that the people I was with and I buy a brand modern gas oil furnace, since ours was already more than a decade old; Now the people I was with and I have another oil furnace that is just as aged and it is starting to have problems. The two of us have had a gas oil furnace for almost multiple decades and it might be time to choice something different. I might choose an electric oil furnace this time, so my partner and I don’t have to worry about running out of gas in the middle of the cold Wintertide season.