Re houseboats and propane refers...most have no accessable bilge below the main cabin sole..
That was true of houseboats built in the '60s and 70's--some are even on pontoons...and there were still a few builders of "step down" (saloon up with a stateroom below, everything else down) houseboats through the '80s and '90s, but most of 'em today are anywhere from 70-150' long with 4' deep "basements" and can even be two story with an enclosed sundeck The inland lakes and rivers in the south are littered with 'em. Google "houseboats" and you'll see some floating aluminum tin cans that'll boggle your mind!
Ironically its gas gensets that kill more folks on houseboats ..not propane
Yup..and the victims are often people who don't know any better than to swim behind a boat right next the genset exhaust.
© 2016 Peggie Hall
Specializing in marine sanitation since '87.
Author"The NEW Get Rid of Boat Odors"