All Beachcomber tubs have the same warranty the difference between the 700 500 300 is tub options and jet count the 700 series has 2 pumps with a circ 500 1 pump with a circ 1 pump no circ. the 2 yr extension to 5 yrs is $499 CND I will say BC has one of the best warranty paybacks for dealers Last year I submitted a claim for 12 hours of work which included drive time and jacking up the spa and it was paid although it took 3 months with no questions asked.