The blower on the boiler seems to be a key element, however you need to have it properly oiled so that nothing wears out or is disfigurementd.
The blower belt can be worn and you can sustain some injury with use.
It is an pressing, costly part of the system that must be treated with love. Why am I telling you this? I didn’t treat my blower with respect. I procrastinated and never called for Terrell boiler service. I figured if my boiler turns on, then it is good to go. The most I did was change an air filter. It always turned on so I figured all was well. Then my boiler started making noises when operating. It was a horrible screeching, squeaking sound every time. It was impossible to sleep, work, or exercise with that racket. I then realized that my minor cleaning duties weren’t going to repair it. My boiler never magically fixed itself either. I called the Terrel boiler repair provider and the guy was legitimately exasperated with the condition of my blower. There were worn parts, frayed belts, and all sorts of debris on it. The disfigurement was expansive, he said. He also told me that I needed to replace the entire blower and the belt affixed to it. It was such a hefty repair. I truthfully debated on getting a whole current boiler. When you factor in the price tag and what you get, it was a smarter option to replace. I chose repair though since the thought of starting fresh was disheartening.