Otherwise, use the yogurt maker or a seed-starter warming pad to ferment the milk —OH Waring Pro YM350 $85 Available from Amazon Manufactured by WaringProfessional yogurt maker, Ym350 series • Read online or download PDF • Waring YM350 User Manual. Heat the milk in a saucepan over medium heat. Once saucepan in ice water. thoroughly homogenous. maker and set for 8 to 10 hours; press the On button. I find that following the exact directions concerning the temperature of the cooled milk to be key for a good result. To this end, I start the yogurt maker and