Was easily installed in my 36 ft trawler and totally kicked the ice cold New Englands winters azz,i entered the hack codes and turned it up wide open,its all in the install take your time install it perfect and you will have have.a trouble free heater that works amazing and uses very little fuel considering it heats a 36 ft boat up to 80 degrees when its single digits outside,ran the heck out of it all winter without 1 issue,would recommend this heater to anyone