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.
From what I've gather on this site the average life expectancy of this equipment is around 15 years. I'd like to just get the heat pump and hope the gas furnace would last 15 more years (life of the new heat pump). The gas (propane) furnace is a Carrier (58SXC080) 92% efficiency.