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Thank you for your inquiry. The Flip-and-Go Stainless Mug SM-QHE48 has the following heat retention* capabilities: 189°F @ 1 hr. / 160°F @ 6 hrs. Please contact Zojirushi America Customer Service for further assistance by email at [email protected] *Rating is based on water at a starting temperature of 203°F (95°C) at a room temperature of 68°F (20°C)
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