Toddler and a Hot Tub

It should be fine as long as you make sure there is a protective cover over the filter - keep the temp within "reasonable" range: my parents have a hot tub that the little ones love to go in with the adults. There is a federally approved safety cover for the filter (one proven that it will keep hair and body parts from being sucked into the filter which is a HUGE problem causing many many drowning deaths nowadays) and we keep it about 98F when the kids will be going in it. I mean, you put your child in a hot bathtub every day, its not the temp of the water that is the concern.
Toddlers have sensitive skin though - all I watch out for is a rash from the chemicals. We use bromine as opposed to chlorine, it is more gentle on the skin. Have fun!

I don't know about hot tubsm but pools where little kids learn how to swim are generally kept in the 80s. If I were you, I would call a few swim schools and ask them what temp they keep their pools. Many young kids are uncomfortably cold with the water in the 70s. I'm assuming you're not planning to have the jets on either. I would check w/ a pediatrician before allowing a small child be near hot tub jets -- they're pretty strong.
K.

We have a hot tub and have had my now 2 year old in it since she was a baby. We generally keep it about 95-98 while the kids play in it. We do not allow the jets to be turned on while kids are in. Hope this helps, we have had no problems.

I only wish I knew the answer for you. But you brought somthing to my attention! My husband and I just purchased a swim spa and I have a 2 yr. old and a 5 year old that will be in it alot. If you get an answer pls let me know.It will be delivered on Fri.I never even thought of that. Thank you! L.

Swimming schools heat the pools to a very comfortable 92 degrees.

We also have a hot tub and keep it at 98 degrees. What's most important is to stay with them and make sure they stay hydrated.