My 17' Boler
has a factory-original Suburban Dynatrail forced-air furnace
, I think model NT-12MEC (12,000 BTU/h input, 9,000 BTU/h output). It's much like the current Suburban NT-Series
. One 12V motor drives both the blower to circulate heated interior air, and a smaller separate blower to move combustion air to allow direct venting through the wall. Since the combustion is entirely sealed from the interior, the burning of propane does not contribute any moisture to the interior. I have not used it in seriously cold weather, but around freezing it is marginally effective in keeping the trailer warm enough, but really noisy. I suspect that this unit is not a good example of its type, after 27 years...
The installation instructions for my furnace call for a minimum of 14 AWG wiring, hinting at the current draw of at least a few amps at 12V, but I have not seen a current or electrical power specification
in the manual. The "Dimension Chart"
for the current NT-Series says 2.8 amps. It would still be vastly less than actually heating with electricity: 9,000 BTU/hour is 2,635 watts, much more than a 15A 120VAC circuit can provide, if that were even available.
Other Bolers have "gravity" furnaces
, which are propane-fired but depend on natural convection to move the air, so they require no power. I don't know if you can get these anymore, or what make and model they were.
There have been lots of discussion in this forum of catalytic heaters
(not all) of which are unvented, so all of the moisture created as a product of propane combustion ends up in the trailer. Ventilation is required to supply replacement oxygen
, as well as get rid of that water; apparently many owners find that this is not a problem. There are other brands of heaters which are not
catalytic, but are still unvented propane-burning heating appliances.