Reddit reviews Keurig K15 Mini Plus Brewing System, Platinum

With the exeption of something like the Cuisinart SS-300 (http://amzn.com/B006OP8XMC) or the Keurig K10 (http://amzn.com/B00E2HKZL6), that don't have any water in them until you put it there, MOST Keurig brewers have about (by my guess) 4-5oz of hot water in it at all times to speed up brewing. That's where the heating element is that comes on every once in a while, and why the pump then the heating light come on after your cuppa is finished brewing. You push a button, it throws some water from the reservoir into the REALLY hot water, and it heats that for less time because it's already pretty warm, and then dispenses the hot water, and fills itself back up and heats the fresh water in it's reservoir to get ready for the next brew cycle.
So lets say you brew your Chai. You then proceed to dump out the water from the reservoir, and dump in the Chai. But the indicator says you're out of water. Because it won't run with just a few oz in the tank. So, on my warning, you brewed three cups. Now it'll run. You run a cup through to get the water out of the reservoir and then you throw a fresh k-cup in the maker and hit the button again. Maybe it burns the chai, maybe not, but it's not going to do the heating element any favors. Then it proceeds to dispense your half-burned half-regular chai, and then your machine sucks in straight chai for the next cup. So you then have to rinse the dispenser (chai latte means you have to wash it, powdered milk), and run a few regular cups to get the straight chai out of the reservoir and off the dispenser.
It's just not worth it. 10-15 brew cycles to maybe get back to normal, wasted time. Just get an electric kettle an do it by hand if you want stronger. Not like it's difficult.