I used a regular Black Cat in early September when
it was 32 degrees (at 9,500').  There was a strong,
gusty wind.  With the top up, nothing much was
happening.  When I shut the pop-top, it warmed up
nicely.

Then I installed the Carver P4 I've had for a couple
of years and on a recent trip to the high desert,
it was 23 degrees the first night.  It took the
Carver about an hour to get it warm (with the top
closed.)  I believe the Carver is ~7200 BTU and
the Coleman is ~5000.

Neither comes close to the BA6 in my '81!

                        Richard A. Jones
                        Boulder, Colorado
                        '81 Vanagon   Mr Bus
                        '87 Syncro Westy   El Jefe