Abstract: A segmented watertube boiler system allows for rapidly expanding the capacity of a boiler. The system joins boiler segments to form a boiler. The segments have portions of the boiler so that the storage capacity for water and heat are increased with the number of segments uses. Any openings in the segments on the ends are capped off and heat and water sources are attached. The boiler can be cleaned and maintained by simply disassembling the segments to provide access to the whole boiler.

Abstract: A sectional boiler is described as made of cast iron or aluminum, in particular a condensing boiler, having essential annular sections, a front section, at least one rear section and at least one center section being provided, which form a combustion chamber having an essentially surrounding heat exchanger made of a sectional block, whose annular water chambers are connected to one another and which has gap-like heating gas flues, which extend between two adjacent sections with a mutually adapted geometry approximately radially and empty into an exhaust gas collection chamber, and having a return port and a feed port. The present system is based on the objective of optimizing a sectional boiler made of cast iron or aluminum as a condensing boiler particularly with respect to compactness and robustness.