In a message dated 1/29/2015 11:12:48 A.M. Eastern Standard Time,
jpalmer@MYMTS.NET writes:

I've  never seen a Canadian van without a gas cabin heater.  My old 79 had
a  similar setup.  It is factory for sure.  I've always understood them  to
be Eberspachers but one response seemed to suggest it was a Webasto.
I've never seen a Webasto coolant heater.  My understanding is all
Webastos are aftermarket and all

there were canadian vanagons sold without auxillary cabin heaters.  it  was
an option.

as far as the Webasto BBW46, it was a factory option on the waterboxer
canadian vanagons.  its not aftermarket.

google "webasto bbw46 in vanagon" for more info and pics.