This is a wonderful addition to our kitchen!   It comes with the water heater unit.   I love that I can hook my water filtration system up to it so that both the hot and cold water is filtered.   The hot water only takes 2-3 seconds to heat up completely.   You can adjust how hot you want it to heat the water.   The faucet itself is good looking and subtle, although not super luxurious in appearance.   From the kitchen remodel we did this is probably the most useful item we have put in!