My neighbor has a Tarm Pellet boiler installed last year and has had significant problems with the system - back burns, fire suppression system firing without reason and ruining his bin of pellets. The firm from central maine who installed the unit along with solar tubes has been out several times without success. Has anyone had similar experiences with the Tarm unit? Any advice.. We use a Harmon wood/coal boiler and enjoy the simplicity and heat. Thanks for your thoughts.