Review (1/5): no heat
Although the box says "with HEAT," the manual notes that "Heat will only help to maintain the temperature of water placed inside the footbath. It will not heat cold water. For a warm water massage, fill the unit with warm water."
Not being overly picky we filled it with hot water from that tap. Unfortunately the product failed to maintain any heat at all. I think a glass of hot water in the fridge would have maintained better.
We're returning this product once it drys out.