De Dietrich 83450003 DTG 350 intermediate section

This is an intermediate section for the De Dietrich DTG 350 boiler range, listed under the heat exchangers catalogue category. It forms part of the heat exchanger block, where flue gases pass heat to the water circuit. In modular heat exchangers, the boiler output is determined by the number of sections assembled together; an intermediate section is designed to be bolted between the front and rear sections, with water and flue gas passages that align when the block is compressed. When replacing an intermediate section, the critical selection parameters are the port configuration and the gasket sealing surfaces. Sections from the same boiler range are engineered to match, but physical verification against the existing block is recommended because dimensional differences or gasket thickness variations can cause leaks. Typical failures for sections of this type include gasket deterioration, cracking from thermal stress, and scaling on the water side or soot accumulation on the gas side. In condensing appliances, corrosion where condensate collects is also a known issue. The part is supplied without gaskets unless stated otherwise; it is good practice to replace all gaskets and seals when the block is opened.