Homemade Hot Tub Heater Elemenet Question?

So i have been thinking of building a small two person hot tub and have some questions about the heating element. my plan was to make almost the same thing that hot tubs use sort of an in-line heater. the plan was to get a water heater element thread it into a pipe and use a pump to circulate water from the tub... show more So i have been thinking of building a small two person hot tub and have some questions about the heating element. my plan was to make almost the same thing that hot tubs use sort of an in-line heater. the plan was to get a water heater element thread it into a pipe and use a pump to circulate water from the tub passed the element. also an arduino micro controller would be used for temperature control. So, what does everyone think, am i missing something huge or is there a possibility of being electrocuted?
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