I did a system with an Instant Hot (IH) and Reverse Osmosis (RO) into a single faucet. The RO also feeds the freezer for the ice maker. The water is not chilled, but at room temperature. It's only a minor inconvenience, because in order to have cold water you have to either use ice or store a pitcher in the fridge. I had originally considered a water chiller too, but after doing a little research, I found that not many recommend chilled and hot into the same faucet. I think one of the few systems available was from Everpure or something like that. But it was expensive. My system is set up to flow like this: Cold Pipe->RO->Faucet Cold Line->IH->Faucet Hot Line The faucet is vented and has a third line out so it feeds the IH, instead of the RO feeding the IH. After living with my system for almost a year now, I don't have any real complaints. I've only run out of IH and RO water once. That was the first time I entertained during the holidays. I got cute and made tea with the IH while also making coffee with the RO. This was also after serving drinking water from the RO throughout the party. RO takes a few hours to replenish and the IH shouldn't be run on empty. So I had to shut off the IH. Since then, whenever I entertain, I just use a kettle to boil water for tea. Then the IH to top-off or for other cooking needs. I got my IH and RO from Costco and the faucet is a Tomlinson that it designed for RO and IH. Quick & Hot from Costco: http://www.costco.com/Browse/Productgroup.aspx?Prodid=11226343 RO from Costco: http://www.costco.com/Browse/Product.aspx?Prodid=10034720 Tomlinson Faucet: http://www.uswatersystems.com/shop/products/Tomlinson-Hot%7B47%7DCold-Contemporary-Reverse-Osmosis-Faucet.html

look at insinkerator. they make a faucet that has instant hot & cool water levers w/filtration. but for really hard water, consider a water softener for the home.

Lissa- I just had a Franke Little Butler installed three days ago and I can't tell you how much we love it. The reason I chose it was that I wanted both the hot and cold water to be filtered, and at the time I was looking, Franke was the only company that did this that I found. (I bought the unit last year, yes it has taken THAT LONG to get to where we were ready to install it). The Insta-hot brand filtered the cold but not the hot water. Anyway, the unit is not that big-- the heater is a rectangular cube about 11x7 inches. The filter (it is a Franke triflow filtration unit) is a cylinder about 11 inches high by 2 inches in diameter. However, I don't have a separate cooling unit for the cold water, since the temp coming out of the cold tap is good enuf for me. Also, my fridge has filtered cold water for those times when it matters to me. But the Little Butler filter, heater, and my garburetor fit very comfortably in the sink cab, which is 36" wide. As for cost, when I was looking these units were quite high, but I bought mine from an ebay storefront with 100% positive feedback for about half the price I was quoted in the snazzy plumbing showroom (can't remember numbers now, it's been so long). Hope this info is of use, good luck!

I am looking at cold water faucet for undercounter filter. I like the Hansgrohe Allegro but you have to buy the water system for it. Redoing kitchen and currently have GE system from Home Depot. May use same one but not sure. You have to plug in the Hansgrohe system and hate to sound ignorant, don't know if the GE one plugs in. This is for a winter home in Florida so I don't know off hand. I will check Home Depot. Thanks for any input.