After using the furnace as few times in cold weather, we soon realized that its output was barely enough to warm the Alto, let alone get it to a cozy level. There is more volume of space to heat than a Westfalia, perhaps just a little too much more. Fortunately Propex does make a larger model, with an output of 9800BTU, which is almost half as much more than the model we have. We contacted the dealer and were able to come to a fair arrangement to swap for the larger version. In hindsight, this should have been our first choice, but I suspect I was concerned with the fitting the larger version into such a small place. Turns out those concerns were mute, it fits just fine. Modified the holes through the floor a bit, and this allowed the furnace to sit correctly, as the stainless steel tubes are a little larger. Other than that, all my previous work was reusable.
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