I love my yogurt maker. (See this post about it .) I make yogurt every week in it. Bill and I both eat yogurt and granola for breakfast. Mine makes 7 little 8 oz jars of yogurt that take up a lot of space in my refrigerator. A while back, I decided to see if I could make my yogurt in pint jars instead. 4 of them fit into the yogurt maker. That worked and I was able to make 4 pints of yogurt at a time. Wide mouth jars make the yogurt easier to get out with a spoon.
Today I wondered if quart jars would work too. Sure enough, 3 quart jars fit my maker. I had to use a larger pot for the extra milk and I increased the time I leave the jars in the machine by about an hour. Now I have 3 quarts (I increased the amount of milk in my recipe to 3 quarts) of yummy yogurt taking up less space in fridge than the smaller jars and I don't have to make yogurt quite so often. I still use the clear cover that comes with the machine but I cover all of it with tea towels (see picture below). I think it keeps more heat in - it may not be necessary. I actually used the same amount of my heirloom yogurt as a starter in both pints and quarts as I did with the smaller batches. here's a link to a heirloom culture that makes your own yogurt the culture - lasts forever! Heirloom Yogurt Culture
Below are quart jars, the amount of culture I used and the covered yogurt maker.