Delta Advance Clean Series Overview
The Delta Advance Clean bidet seat line entered the market as a natural extension of the Delta bathroom brand, focusing on water efficiency and ease of use over luxury feature stacking. Both models carry EPA WaterSense certification, meaning they meet strict water flow efficiency standards. The seats are compatible with most standard two-piece toilets and select one-piece designs, with elongated and round bowl versions available for each model number.
Delta 1H604 -- Best Full-Featured Advance Clean Model
The 1H604 is the top Advance Clean model with a heated seat, adjustable warm water spray, posterior and frontal wash modes, warm air dryer, and a deodorizer that uses an activated carbon filter to neutralize bathroom odors. The night light feature emits a soft blue glow from under the seat rim, useful for nighttime bathroom visits without switching on overhead lighting. The 1H604 is WaterSense certified and uses a side panel with large tactile buttons. Retail price is approximately $350 to $420.
Delta 1H602 -- Best Value Without Dryer
The 1H602 omits the warm air dryer and deodorizer found on the 1H604 but retains heated seat, warm water spray, posterior and frontal wash, and the WaterSense certification. For households who prefer towel drying after washing, the 1H602 delivers the core bidet seat experience at $250 to $300. The water pressure is adjustable across five settings, and the spray width has three adjustment options. Nozzle self-cleaning performs a brief rinse before and after each use.
WaterSense Certification and What It Means for Daily Use
WaterSense bidet seats meet EPA criteria for water use efficiency during the wash cycle -- specifically, flow rate during the spray function does not exceed the WaterSense threshold of 0.5 gallons per minute. In practice, a 60-second wash cycle on a WaterSense-certified Delta seat uses approximately 0.5 fluid ounces of water. Delta markets this as "Clean. Certified. Efficient." across the Advance Clean line. For households replacing toilet paper use with bidet washing, the water savings from the bidet seat are offset many times over by the paper reduction.
Which Delta Bidet Seat to Buy
Primary bathroom users who want the full bidet experience including deodorizer and dryer should choose the 1H604. Guest bathrooms or secondary bathrooms on a tighter budget are ideal for the 1H602. Both Delta Advance Clean models install identically and share replacement parts across the lineup, simplifying long-term maintenance. Delta's established retailer network (Home Depot, Lowe's, and plumbing supply houses) makes in-person purchase and return straightforward.