I have read from multiple sources that it is possible to extract tannins if you steep in too much water. I use 1/2 gallon of water per 1 lb of grain. I try to steep between 150-155 for 20-30 minutes on my stove top. I start the rest of my water on an outdoor burner with about 15-20 minutes left. That way once I am done steeping my main kettle is coming to a boil. I add my steeping water then cut the heat and add my extract. It works well for me and saves a little time. Just one extra pot to clean thats it.