I bought this hot tub in October 2023 and despite being in a well insulated room in December the resistance to heat the water stopped working. I contacted the manufacturer who sent me the spare part. The process of replacing the resistor is very complex and poorly supported by the company and also dangerous for those who are not experts since it requires terminating and redoing electrical contacts which are housed a few centimeters from the water. The repair only worked for a couple of days so I contacted Wayfair and requested a new hot tub be sent to me.
The process of disassembling and sending back the package for a product like this is much more complex than you might think. After about three weeks I received the new hot tub which worked well for about three months and then stopped working again, this time it wasn't the resistance to heat the water but the motor which keeps turning off.

I do not recommend this product, it is not made to last.