Since I am a big tea drinker in the morning, I thought about including one in our new house. But then looking around I saw that they are not instant heaters but rather have tank to store hot water. So rather than heat and store hot water 24/7, I just pop a cup of water in the microwave for 2 minutes and I have my "cuppa". Repeat as necessary! Maybe I'm wrong but I think this approach uses less energy.

Yep, Insinkerator's are supposed to be trouble. We've been extremely happy with our Everhot from Water Inc. We installed it in late 2002 and have no complaints. I'm a big tea drinker and DH uses a french press coffee maker, we'd be lost w/o it !

Here is a link that might be useful: Everhot

I am on my second In-Sink-Erator H990W-SS instant hot water dispenser. It has a 2/3 gallon stainless steel tank under the sink, and I use it constantly. I had the first one for about 10-12 years I'm guessing, and it only failed because the electricity was upgraded in my neighborhood, and since I already had it cranked up to its maximum temperature (200º), something apparently blew and it stopped heating. But it never leaked. This model is not the most attractive one, but it's the only one that will work in my kitchen sink, and it serves my purposes very well. You can also find models that dispense both hot and cold water.

Searching about this topic on gardenweb, I stumbled upon this exact same thread that was posted within minutes so if you want to keep reading you can continue there...

Here is a link that might be useful: Instant Hot Water for Kitchen Sink - GardenWeb