Well I wanted you to get on aim cuz my internet is running slow right idk why...well both of your snakes shall do fine in a 41qt tub...also there's a thread about your UTH question in the DIY forum...also the heat from the UTH is far away from melting a tub...I use a temp controller for my tub & it does just fine no melting...tomorrow hit me up on aim to discuss the rest or if u got any other questions...thanks...