There is inevitably some cannibalizing of new sales due to the availability of used units, but we think it is very minor. New units offer a certain degree of risk reduction with the manufacturer's warranty being in place. There is no warranty coverage for secondary owners. A used Coal Gun that is properly installed as a pressurized boiler, and not sitting in a damp or wet basement during the off season, likely has a long, long lifespan still remaining. 30+ years is not out of the question. Just as a guideline, you might start with a deduction of $2,000 for used, then deduct for years in service (maybe 5% per year), deduct for needed repairs, then for cosmetic demerits, then labor to remove (if you the buyer are responsible for this).