The Hercules Haymaker tankless water heater descaler kit includes solution, pump, hoses and a bucket to remove scale and maintain optimal performance of a tankless water heater, the company notes. The solution quickly and easily dissolves inorganic deposits that restrict flow to restore circulation and heat transfer efficiency. The Haymaker solution dissolves three times the amount of scale as a gallon of white vinegar, without the foul odor, the company says.