I'm getting ready to convert a 2021 Promaster 159 this Spring and have been researching for a heater. I like the fact that the Espar has an automatic alltitude adjustment but have read that there have been problems with the unit. Would love to hear from the community as to what you all recommend. I also read that Heatso is not a licensed dealer for Espar? Does anyone know of that is true?, and if so were is the best place to buy one? How are customer support for either of these manufacturers? Any and all help is greatly appreciated.