I have one propane fueled platinum media 5,000 btu (maximum) catalytic space
heater with regulator.  This can be setup to run as a portable dedicated unit
fueled by disposable propane cylinders, or permanently mounted and attached to
an RV propane system.  It is 13" by 9" by 6" and was most recently fueled by a
grill sized propane cylinder.  First $85 owns it.  I believe that is a very low
price for such a unit.   Just rediscovered it while looking for a new cruise
control that's hiding somewhere around here.   Anyone on the list capable of
"remote viewing,"  please just e-mail to me and tell me where it is.   <G>
John