Surgery - Colorectal. In brief: Yes, most docs can. Most hemorrhoids should first be treated by conservative measures, such as bulking the stools, education to avoid bad habits like straining, sitting for long periods of time, etc.
Either system will have a burner. 23 years may very well be beyond the typical life expectancy of a oil burner, but a furnace or boiler should last considerably longer than 23 years. The boiler of my house here in MA is 58 years old and still works fine. I am starting to consider replacements, however.
Storage and Shelf Life. Unopened peanut oil lasts a year or longer, but opened peanut oil safely lasts four to six months before turning rancid. All oil eventually oxidizes and turns rancid as it ages, and rancid cooking oils have a negative effect on taste and health.