A:Answer Hey there, and thanks for contacting us with this great question. The Deep Fill button will add 3 more gallons of water if you press it once. If you press and hold the button for 3 seconds, the washer will fill to the maximum water level. This will be approximately 26 gallons except on portable/stationary models, whose maximum water level is approximately 20 gallons. We hope this is helpful. If you have any other questions or concerns, we’re glad to offer assistance any time. All the best! -Sarah@GEA