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Since 1865 until 2001 the Offenbacher Dampfkesselfabrik & Eisengiesserei Philipp Loos GmbH has been producing steam boilers. Within these 136 years more than 28250 boilers have been produced and have been exported worldwide.

We would like to inform you that on May 1, 2001 the boiler manufacturing activities have been handed over to LOOS International.
In 2009 Loos International becomes a subsidiary of Bosch Thermotechnik GmbH, Germany.

Since 2012 products are sold under the Bosch brand name

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If you need spare parts or support for a steam boiler please send your inquiry to Bosch Thermotechnik GmbH,


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