The product I used to make was a flameless reboiler for lotto. Your flameless reboiler should have the same principle as ours. The reason why it is reheated after leaving the fire comes from the steel ring below the pot bottom, which is made of various composite metals and has the function of absorbing heat. When the pot is heated on the fire, the composite metal ring absorbs heat continuously, so when it leaves the fire source, the composite metal ring begins to release heat slowly. Therefore,