There was a gasoline-fired coolant heater called the BBW-46 made by Webasto , Canadian market only.The BA-6 was a North American air heater that was optional in air-cooled Vanagons 1980-83.The Diesel Vanagon has a  Diesel fired version , the DA-6. The BA-6 and DA -6 were made by Eberspacher.There was a smaller under-bench seat version called the BA-5. I've only seen one BA-5, in a Dehler Profi
I sell and service these so if you need parts or advice just holler. 
Robert1982 Westfalia

 
      From: Rob <vwrobb@GMAIL.COM>
 To: vanagon@GERRY.VANAGON.COM 
 Sent: Wednesday, January 28, 2015 8:36 PM
 Subject: Re: Gas heaters...was Re: Heater
   
Wasn't there a Canadian option for a gas heater for the cooling
system (pre-heat the coolant in the winter)?

Rob
vwrobb@gmail.com

At  1/28/2015 06:36 PM, Alistair Bell wrote:
>My bbw46 was mounted in engine compartment, left hand side wall.
>That and an octopus of additional coolant hoses.
>
>Was option here in Canada.
>
>Alistair