Instruct: Classify Amazon reviews into positive or negative sentiment
Query: worst purchase ever made

After a lot of money, installation expense and now recent calibrations, etc. it still fluctuates so much in temp or just turns icy cold it is impossible to have an enjoyable shower. I echo all the other 1 stars reviews. worst purchase I have ever made in my life. wish I would have read reviews first. Used these overseas and they worked fine - this unit is junk.