DUBLER HEAT Flameless Chafer and Cooler The Dubler HEAT, a combo Dubler with Heat Packs, is a unique innovation as a modern flameless chafer and cooler combination that fits two 1/2 size food pans up to 4” deep (more than the 2.5” deep in a standard chafer). The Dubler does not generate heat but the premium insulation, along with the microwaved heat packs and placing hot food trays straight from oven, all provide a slow drop in temperature over time. The outside will remain safe to touch for easy mobility. The length of time of hot food depends on several variables. Drop in microwaved heat packs*, followed by hot food pans right out of the oven and cover.