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.
The good news is that home heating oil should last 18 to 24 months, as long as effective additives were mixed with it upon delivery. The most common variety, known as No. 2 heating oil, is essentially the same product as diesel fuel, except diesel has additives intended to boost effectiveness in motor vehicle engines during cold weather.