So, can we just have a 'myth busters' exercise done here?
Someone with a 20-22ft boat, beg/borrow/steal a thermometer and test:
Cabin on its own for 1 hr
Cabin with 1 occupant for 1 hr
Cabin with 1 occupant + tealight method for 1 hr
Simply record the temp and report back! (I'd do this but my boat may be too big for the test)
