A method for deep frying a food product in a deep frying device, wherein the deep frying device - is arranged for heating fat using flue gas, and - comprises a container, which container comprises wall sections, which wall sections comprise at least - a bottom wall section, - a front wall section, - a rear wall section, and - two upright longitudinal wall sections which interconnect said front wall section and rear wall section, and the wall sections define a lumen of the container; wherein the container contains a fat; and wherein, in order to deep fry the food product, the fat is heated using a burner, and the food product is deep fried in the heated fat; wherein the container comprises a main wall section selected from - the bottom wall section, - the front wall section, - the rear wall section, and - an upright longitudinal wall section; the deep frying device comprises a heating section, wherein the heating section comprises - a wall unit, and - a pipe section; wherein the wall unit comprises an inlet for relatively hot flue gas and an outlet for relatively cold flue gas, and the pipe section protrudes from the main wall section into the lumen and is not rigidly connected to the other wall sections; and wherein the pipe section protruding into the lumen of the container comprises - at least one supply pipe for the relatively hot flue gas, and - at least one outlet pipe for the relatively cold flue gas coming from the at least one supply pipe; wherein for heating the fat hot flue gas is passed via the inlet of the wall unit through the pipe section and discharged via the outlet of the wall unit; wherein at least one supply pipe of a plurality of supply pipes is provided with a plurality of channels provided transverse to the longitudinal direction of the supply pipe, which channels - extend from the outer wall of the supply pipe via the inside of the supply pipe to an opposite part of the outer wall of the supply pipe - comprise a first end situated relatively low and a second end situated relatively high in order to be able to pass fat from the lumen through the channel. - is arranged for heating fat using flue gas, and - comprises a container, which container comprises wall sections, which wall sections comprise at least - a bottom wall section, - a front wall section, - a rear wall section, and - two upright longitudinal wall sections which interconnect said front wall section and rear wall section, and the wall sections define a lumen of the container; - a bottom wall section, - a front wall section, - a rear wall section, and - two upright longitudinal wall sections which interconnect said front wall section and rear wall section, and the wall sections define a lumen of the container; - the bottom wall section, - the front wall section, - the rear wall section, and - an upright longitudinal wall section; - a wall unit, and - a pipe section; - at least one supply pipe for the relatively hot flue gas, and - at least one outlet pipe for the relatively cold flue gas coming from the at least one supply pipe; - extend from the outer wall of the supply pipe via the inside of the supply pipe to an opposite part of the outer wall of the supply pipe - comprise a first end situated relatively low and a second end situated relatively high in order to be able to pass fat from the lumen through the channel.