Best Water Dispensers for Your Kitchen - The Home Depot These dispensers feature a faucet connected to a small storage tank that is mounted under the kitchen sink. The tank is connected to the cold-water supply line and to a standard 120 Volt household circuit that powers an electric coil. Temperature can usually be adjusted and range from around 140 degrees to just under 200 degrees; Make sure the water doesn't get too hot or it can damage the tank