The Kotlostroene JSCo factory in Sofia is the only factory in Bulgaria that specializes in producing heating and hot water boilers that provide hot water for central heating systems for residential and industrial needs.

Kotlostroene also offers low peassure steam boilers for the production of saturated steam at pressures up to 0,05 MPa and temperature 110° C. Kotlostroene produces PK type Industrial steam-pipe biolers for the production of saturated steam. KV and VK types Water heating, steam-pipe boilers - supplying hot water for central heating system and industial processes.

Kotlostroene also operates a workshop for gas-tight membrane tubular walls. The production line for this workshop has been provided by the leading German company - Babcock.