THIS IS A KOHLER MODEL # 12RES 4800 BTU IN EX COND! I USED IT ALONG WITH 4 SOLAR PANELS TO RUN A 2000 SQ FT HOME THAT WAS OFF THE GRID I PAID ALMOST $6000 WHEN I BOUGHT IT. AND I HAD THE ENG REBUILT LAST YEAR BY A KOHLER DEALER AND HAVE ALL THE REC ON THE WORK DONE ASKING $1900 CALL 559-292-5654 OR EMAIL [email protected] I LIVE IN FRESNO CALIFORNIA