to be fair, the weather here in NY has been in the low 30's to teens overnight, so it has been taking longer than anticipated for the tub to heat up.  Im having some issues with the jet streams running every 3-4 minutes rather than continuously so I called customer service and they have been great with assisting me in contacting the manufacturer.  Fingers crossed that this unit isn't faulty as I am looking forward to having my son who has Cerebral Palsy to use it for relaxing his muscles.  Thanks Wayfair for the customer service and prompt responses to my questions :-)