I have the Harbor Freight 1.5 Ultrasonic, it is a delight and works
to perfection. It does not have a heater, but I start out with hot
water and no difference at all.
I am very loyal to Kenneth Singh, and Rio Grande, Harbor Freight
fills the bill when my wallet so deems it. I have not had a single
product failure from Harbor Freight, and I appreciate being able to
do things at home, rather than wait for studio time.