Cal Spas / Terrible experience
In less than a year our heater failed. They had the nerve to blame it on "water chemistry" and would not honor the warranty. Our water had good levels of everything, was clear, no issues, etc. These people called us every 2 days for a month trying to sell it to us, then left us in the cold (literally) when it broke.
Oh... even if the heater was covered, we were going to have to pay at least $115 for a service visit from their authorized repair company in my area.
I think these guys are scam artists and should be avoided... unless no warranty is OK with you.