De Dietrich 97951037 fire tube D120

This is a fire tube, a component that forms part of the heat exchanger in a boiler. It carries hot combustion gases through the water jacket, transferring heat to the heating circuit. The tube is identified under the De Dietrich brand with manufacturer codes 97951037 and 336.832.001, and it is listed in the boiler pipes, flanges and connections category. When selecting a replacement fire tube, the critical factors are the tube’s outer diameter, wall thickness, overall length, and material grade. These dimensions must match the original tube to maintain the correct heat transfer surface area and to allow proper fitting into the tube sheet at both ends. The tube material—typically carbon steel or stainless steel—must also be compatible with the operating temperature and the condensate chemistry if the boiler is condensing. A fire tube is not a generic part; its geometry is fixed by the boiler model. Replacing it with a different size or material can alter the heat exchanger performance, restrict gas flow, or cause leakage at the joints. Always compare the code embossed on the original tube against the codes listed for this article before ordering. No further specifications, such as dimensions or material, are available from the product data.