Review title is Much better than a water based stone warmer [SEP] I bought this in summer time to decrease the temp in my massage room. Even with the ac cranked the excess heat from the hot stone warmer filled with water in my room was cooking me.<br />This stone warmer heats up in about 20-25 minutes, stays consistently warm and even after 8 hours the stones aren’t too hot to touch.<br />If you are a massage therapist and on the fence about this, treat yourself to this clamshell. Honestly one of my favorite tools I’ve purchased so far.