So I started my did for the first time yesterday, set it to 104°, came home a couple hours later and it was right on the money. After about 30 min use I decided to set the temp to 102° so I could try and see the difference the next day. I used the tub a while longer that night, plus a few hours of Jets running as I was aerating the water for chemicals.
This morning I found the water has increased to 106°, and after running the Jets another 30 min for more chemicals, it rose to 108°. Display still shows set temp of 102°.
Am I correct that it's just from running the Jets?