Bianka had a Frigoboat 500 engine driven compressor refrigeration system when I bought her. It worked well for a few years. Then one day it died. I found out it used R12 refrigerant gas. This was bad news because the the stuff was no longer made. The reason for that is it was bad for the environment. Remember the Ozone hole? The idea of repairing it became moot when I converted the boat to electric propulsion. So back in the diesel days while I was debating about what to do about the Frigoboat system I came across an Engel MT25 E refrigerator/freezer.