Includes concentrated vinegar (dilutes to 4 gallons household strength), 1/6 HP pump, braided steel hoses, square bucket, maintenance card, and instructions. 1/6 HP pump ensures efficient water flow and limescale removal with thermal overload protection. Braided steel hoses provide long-lasting durability and leak-proof operation. Vinegar solution offers a natural, manufacturer-recommended descaling alternative. Large 5-gallon square bucket simplifies preparation and storage of descaling solution. Prevents costly repairs while extending the life of your water heater. Works with all leading tankless water heater brands like Rinnai, Bosch, Rheem, and Ecosmart. Maintain your tankless water heater with the Allied Science Flushing Kit, featuring concentrated vinegar, a 1/6 HP pump, braided steel hoses, a 5-gallon square bucket, an instruction manual, and a maintenance card. Recommended by some manufacturers, vinegar is an effective, eco-friendly solution when diluted to 4 gallons of household-strength vinegar. This kit ensures reliable descaling to improve system performance and prevent costly repairs.