Home Depot’s Daily Deals include up to 20% off select water heaters and water treatment systems, covering tankless water heaters, whole-house filtration setups, and water softeners from brands like Rinnai, AQUASURE, and PRO+AQUA. A Rinnai Sensei tankless gas water heater is $1,532.79, down from $1,703.10, while a Waterdrop reverse osmosis filtration system is $426.99, down from $627.99. Deal ends today. Shop Now at Home Depot