The large one has a warranty . Listen sir, this is clearly not my first rodeo. I appreciate what you think to be help but you are the one that is confused . Right now I currently am running two 90 pint and two 70 pint in that room... 4 dehus.. = to 31 amps .... Running 24/7 .. This is equal to 6 1k lamps running 12/12 . My electricity bill is well over 3000 per month . If I can knock my bill down 200 bucks a month by using an industrial dehu and taking out a couple inefficient Walmart dehus.. Then the unit will have paid for itself within 1 year . Not to mention it puts off less heat , and takes us less room that 4 of the little ones. And it's less amps freeing up some of my breakers.