Bought this thinking maybe we would get lucky and so far so good. just to be clear we ran this on 240 from the get go and one thing is clear, THIS TUB is A REAL SPA. when running 240v with 50 amp service this thing stays hot. it never goes below 104/103 when running jets on high. oh and as far as the jets, running on high this thing creates as much bubble action and certainly enough psi. as a matter of fact it pushes out water as hard as ANY hot tub I've ever seen. it could use a medium setting because high is really powerful. one more time, THIS IS A REAL HOT TUB. great price, heavy insulation that appears to fight off a high altitude winter and a good cover that comes included. i recommend this for some one wanting a smaller hot tub. it fills quickly, heats VERY quickly and stays hot, even through winter. thanks aqua rest spas, good job!!!!