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.
Oil furnaces will keep you warm when the temperature drops during the winter months. These furnaces offer reliable heat from a clean-burning fuel. During the summer, the furnace shuts off its burners and works with your heat pump or air conditioner to circulate cool air.