Abstract: A water supply assembly includes a supply box and a thermostatic mixing assembly operatively connected to the supply box and located at least partially therein. The thermostatic mixing assembly includes a body having a pair of water supply valves, a mixing chamber, and a pair of water outlet ports. The mixing chamber is fluidly connected to the water supply valves for receiving hot and cold water therefrom and providing tempered water that is transferred to one of the pair of water outlet ports. The water outlet ports are fluidly connectable to a faucet to provide a tempered water supply thereto.