Cash Acme Water Heater Tank Booster Pro, Thermostatic Mixing Valve 3/4" with Temperature Gauge, Braided Hose, Domestic and Commercial Application COMFORT: Thermostatic mixing valve increases usable hot water on existing water heaters and new NAECA compliant water heaters PROTECTION: Controls hot water to prevent injury from scalding when showering, bathing or washing by ensuring water is delivered at a safe temperature to all fixtures SAFETY: Reduces the risk of Legionella bacteria growth by enabling hot water to be stored at a germ killing 140F (60C), while ensuring that water is delivered at a safe temperature to outlets COST EFFECTIVE: Adding a Tank Booster Pro thermostatic mixing valve to an existing water heater allows water to be stored at a higher temperature SHARKBITE: use with SharkBite Flexible Water Heater Connectors and Ball Valves for easy installation in systems using copper, CPVC or PEX tubing