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

You don't need 3 separate faucets. I have two: the main faucet I use for washing (which isn't filtered) and then a small hot/cold faucet that's hooked to the filter and the instant hot. I left the filtered cold dispenser out of my original description because it's integrated with the instant hot system. The filter faucet I have is this one, I think. The only thing I don't like about it is that the hot lever is spring-loaded as a "safety" feature, so you have to hold it down to keep the water flowing. (I put "safety" in sneer quotes because I think it's less safe to force me to keep my hand near the hot water.) I actually have a ice/water dispenser on the fridge too. It dispenses chilled water, but it comes out quite a bit more slowly than the non-chilled water from the hold/cold dispenser by the sink. I tend to use the one on the fridge for a quick glass of ice water and the one by the sink for filling pitchers and other big stuff. I didn't try hooking the main faucet up to a filter because I think it would take a big filter to maintain the water pressure and flow rate you'd want from a faucet used for washing dishes, rinsing vegetables, etc. If I have time I'll try to post some photos of what my set-up looks like from above and below the sink. I may have to do a bit of cleaning first, though. :-) Depending on how carried away you want to get, a whole-house filter is an option. My next-door neighbor the plumber re-piped his house and put a big whole-house filter and softer system in his garage. It's two sealed units about 1 foot in diameter and 4 feet high each. He says they have to be changed every 5-10 years depending on how bad the city water is. I can ask him for the brand and model number if you'd like. It looked like a big job to install, though, not a DIY project. (Even for me, and I'm not afraid of sweating copper pipes.) And I'm sure we're talking at least a couple thousand dollars for the equipment and labor. Laura

This is what I purchased from Quality Bath. The product looks great with my stainless faucet. LOVE IT !! Both H & C filtered. Your price is much better! Insinkerator HC1100 Sku: HC1100SN Optional Filtration System: Stainless Steel Tank and Filtration System Finishes and Colors: Satin Nickel $552.75

Sigh. This is the sort of critical answer I thought I might get. I think you are correct that I would probably have to hook up a both the hot and cold inlets of a regular faucet (one-hole) to the cold. I've also been looking at pot-filler faucets. Installing the RO unit normally under the sink with a run to an RO faucet is not really an option I think will work for me because an under-sink tank is not large enough to hold all the RO water I need to produce for the fish tanks and the output MUST go to several large holding containers that I have on a rolling cart, so the output tubing MUST go directly to the holding containers. Plus I really don't want the unit under the sink because I don't relish the idea of crawling around inside the cabinet under the sink to change filters and membranes when necessary.