Review on ☕️ Howay Flat Bottom Coffee Mug with Wood Lid - 410ml Ceramic Cup for Coffee Warmer, Keeps Warm for Tea, Cocoa, Milk and Hot Beverage - 14oz (Black) by Michael Kosack

As for the wooden handled mug... 1.) The IDIOT who designed this is crazy (I'm a design engineer.) 2.) The diameter of the die Aluminum plate on the bottom is 2.25 inches. 3.) The air gap around it is 0.375" x 2 = 0.75". 4.) This means heat only transfers through 1.5 inches. Diameter left (2.25-0.75 = 44% area). 5.) As a result, my mug warmer does NOT keep my coffee hot in this mug. 6.) I fixed it by filling the air gap with epoxy....works MUCH better now. 7.) BTW, the wooden handle is awesome....it doesn't get hot. It takes a little getting used to not putting your fingers through the handle, but I like it now...give it time.