Fothermo

About

Founded in 2019, Fothermo is a private headquartered in Neu-Ulm, Germany with approximately 10-50 employees specializing in Solar.

Fothermo System AG specializes in innovative photovoltaic-based hot water solutions, primarily solar heating rods (PV heating rods) and photovoltaic hybrid boilers. The company manufactures direct current (DC) heating elements that convert electricity from solar modules directly into heat without requiring inverters or complex wiring. Their flagship 550W solar heating rod is designed for retrofit installation into existing hot water storage tanks, compatible with gas, oil, heat pump, and pellet heating systems. Products operate at safety low voltage (<50V), eliminating the need for licensed electrician installation. The company markets its systems as economical alternatives to traditional solar thermal systems, enabling households to reduce hot water costs significantly during summer months while maintaining compatibility with existing heating infrastructure. Manufacturing and development occur in Ulm, Germany. Over 10,000 systems reported in daily operation.

Products