Hot food table with open cabinet base. 15,000 BTUS / 2 and 3 compartments -- 25,000 BTUS / 4 and 5 compartments -- Single control knob with 3 settings -- Pilot indicator openings -- Dish shelf of stainless steel -- Stainless steel undershelf -- Stainless steel lining -- 1" thick poly cutting board (8" wide)."NAT" is natural gas. -- 5" swivel casters, with two brakes on portable units -- Universal mount push handle Wet Gas units are perfect for prepared food. It maintains food temperature with hot steam. Add 1-2" of water to the wet bath unit to achieve the correct amount of hot moisture.