I am interested in a hotspot TX. Ended up liking this one due to some logistical issues with space and access to patio (don't want to use a crane to install on a semi-enclosed below ground patio). My only questions/concerns are: I want a tub that retains heat adequately and appreciate any comments on the TX in regards to this (live in Nebraska with fairly cold winters), and is it okay to just use 110v or is there a heat advantage to converting to 220v? I don't care much about jet strength, and for this stage of life, something that is more affordable, and that I wouldn't mind behind leaving behind is what I'm going for (thus the tx).