I am researching this topic myself. I realize this is months after your question. But insinkerator instant hot has a faucet with instant hot and cold, and it can be filtered or not. There are 2 handles on 1 faucet. My plumber recommended this brand. I have no financial ties or personal experience with the unit.

I thought the new Insinkerator tanks were stainless steel - I know there is now a 3-5 year in home warranty on the tank and dispenser (I think it gets extended from 3 to 5 on the tank if you use a certified ISE installer). Hopefully the new tanks will be an improvement over some of the reviews I have read on the old. I am putting in an instant hot, but with a lot of trepidation after reading some of the reviews over on Amazon. I was hoping that the bad reviews (and I've seen some bad reviews on all of them, not just Insinkerator) were the just the vocal exception because there seem to be a lot of happy instant hot owners here on this forum. The only Q I have is how long most of these people have owned theirs - maybe not long enough to give problems? I do have a friend who just replaced her tank after only a couple of years - it seems crazy that something that is not inexpensive would break so quickly. One thing I am definitely going to do is put something under the tank in case of leakage - I don't want my brand new cabinets to be damaged.

Mine is a Little Gourmet by Mountain Plumbing. I love it, but somewhere in the 3rd year, we had to cut off the end of the rubbery tube that delivers the very hot water to the tap. The combination of very hot water (we keep it turned all the way or nearly all the way up), tube stretched over the connection and then the little wiggle caused by water pressure on and off eventually caused a leak right at the connection (sudden drop in water pressure at the tap). We had enough line that we cut it off and reconnected (2 minute fix), but I plan to go look for a stainless or other line that will hold up better for the long haul. Kind of like the installers suggest changing to a stainless supply line on your washer and dryer. If I had known that going into the installation, I'd have had no issues with it at all. Knowing it now, I'd still get the same unit -- just look for a better hot water line to install it with or replace after a year or two.

---From an earlier post: "Another caveat: I live at (high) altitude, so water takes longer to boil here. Our insta-hot isn't as hot as it would be lower down. (It's still scalding hot, but I did notice a difference.) We canNOT use it for oatmeal (we put it in a pyrex measuring cup in the micro and that gets it hot enough for oatmeal), but that's here. Back in San Francisco it was hot enough straight out of the tap for (instant) oatmeal." --- Just a minor nitpick ... actually, the water boils sooner at altitude, but it boils at a lower temperature, so it takes things longer to cook. (It has to do with the lower air pressure at altitude, and water boils when the water vapor pressure exceeds the atmospheric pressure.) I'm trying to decide on an instant-hot, and I too am at altitude, so thanks for your experience. I guess the temp in the water tank is lower because it has to keep beneath boiling ... just like the coffee makers (coffee is never quite hot enough in the mountains, and just barely at home).