warm water with air dryer, we bought the ATS-500 for the master bath and liked it so much we ordered another one for the front bath. just make sure you have access to a ground fault plug for power. when I searched for the 500 model it appears it's not available but this 800 model works even better. I had to upgrade o elongated commodes in both restroom but not a problem for me as I'm a pipe fitter/plumber by trade. don't hesitate to make this purchase, you won't regret it 

Love, and saves toilet paper. My husband and I were talking about getting a bidet for a long time and this one had everything we wanted. 

Great product. Warm water, heated seat, especially in the winter time. I feel so conformable using it. Also it is great for personal hygiene. You feel so clean and save paper. It is good to use it for every one in your family. I am so happy that I bought it for my family. 

the seat is not hot and water is not hot as well