We had one on our old boat, and if that is your only alternative, they work
fairly well. They must be close to level, so are more prevalent on
multihulls, although I remember hearing of one gimbeled on a mono (my
perspective is sail).
I'm told that assuming it can be maintained at a near level state, the
motion of a boat actually improves the circulation of the ammonia coolant.
It is very important to provide plenty of cooling air. I achieved a big
improvement in cooling temperature by vastly increasing the vent size the
builder provided (do they ever follow the recommendations of the equipment
mfg ?), and added a small exhaust fan. After that, I would even observe the
burner shut itself down.
In addition, bear in mind that these are not really built for the marine
environment. There is a lot of steel that must be painted occaisionally,
else it will rust. But if you have only outboard power, propane frigs can
work well.

wrote in message
oups.com...
I rented a mobile home with a small refrig. that used propane. It was
very efficient and used little propane for a very cold unit. I would
like to get more info on the construction, material, spec and etc of
one of these very efficient portable propane refrigerators. Can
someone help me. PHIL