RE: Dickinson vs Sig Marine heaters
They , by the pictures, seem to use the same float fuel feed device , so I would not see much difference.
That said be sure to install a barometric damper and if you wish it to work underway and un attended (I did with Dickinson for weeks on end) only the "H" style smoke head will do the job.
The H style will allow high ( 40-50K+) and shifting winds to not blow down the stack , as well as the downdraft from sails.
The fan is only useful on start up , most liveaboards will fire it off in November and operate it till May . At least that is what we did in NYC for over a decade.
When the power is out for a couple of days/weeks at your marina , you will be AMAZED at the numbers of other live aboards that visit ....to get warm for the first time in a week!
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