Our previous boat had an old pressure alcohol stove and oven
. It worked just fine to cook on. It's true the heat output is less, so water
takes a bit longer to boil, but we're talking about adding a few minutes. Never a big deal. Can't say I ever noticed it taking longer to cook anything else.
The biggest problem with alcohol wasn't the priming, or the heat output per-sey, it was the challenge of carrying sufficient volume. We went through about a gallon per week, cooking all meals
for two. We usually go out for 5-6 weeks at a time, so we had to carry a 5-6 gallons of liquid fuel
. Was ok, but more would have been a challenge.
Propane, or even kero, is certainly a lot more efficient from a storage/carrying perspective.