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.

There are many teas that are more optimally brewed at temps below boiling. Especially green tea. Just had to throw that out there. I didn't put one in, and sometimes I regret it. Grew up with one, my parents' current kitchen has one. Mom's favorite discovery was that if she was measuring something sticky - say molasses or corn syrup for a recipe - she'd quickly run the measuring cup under the hot tap to make it nice and warm then the molasses or honey would slide right out of the cup. But, she initially installed it for easy tea, cocoa and that type of thing. With a temp set at 200* it was definitely fine for brewing a cup of tea. She used it for all the above mentioned options as well. Quick rinsing and refreshing pasta among them. My dad is now a widower and will use it to get a quick start on pasta water. Fill the pot from the insta-hot, put it on the stove and it is boiling that much faster, almost instantly. Safety. That really depends on how often your child is playing at the sink where you would install it. They might now come with safety features. It is certainly hot enough to cause a burn. Depending on the ages of the kids, I think they could be taught pretty quickly not to mess with it.

I got mine at Costco ($170) but the faucet wasn't correct so I bought a different faucet and still the combined price was much more reasonable I actually cannot remember offhand where I got the faucet, will have to think about it, but found this site which is very reasonable i do love it (by the way everhot, has many many names, including quick and hot Here is a link that might be useful: amazingly priced

I have my Instant Hot really cranked up so it has a tendency to sputter when I'm not around. Yeah, I know I will lose in longevity what I've gained in temperature. I use the Instant Hot water to warm up the Chemex pot or Melitta and heat up the cups before I make coffee. (I rarely make tea.) You don't want a rolling boil for coffee or fine green teas, so the Instant Hot works fairly well. Admittedly, it is not 100% perfect, but since it is slightly cool it does not bring out the bitterness.