There are a couple of us with Espar heaters and In looking for additional information I came across this web site http://www.letonkinoisvarnish.co.uk/Ebe ... tro_1.html which give a fairly detailed view of what they are how they work and how to repair. I run mine on water white kerosene and so far it has not needed rebuilding.
Another option is the Propex propane heater which is available in the US. http://www.propexheatsource.co.uk