About Green Heat International

Green Energy & Waste Solutions for all of Africa

Green Heat International provides revolutionary energy, waste and fertilizer solutions for homes, schools, farms and commercial buildings. Our environmentally-friendly products convert waste into clean and reliable biofuel and fertilizer. At the same time, reducing the dependence on water resources, reliance on non-sustainable biomass, and mitigating deforestation. Our core product, biogas digesters, are equipped with a leading edge technology known as a Slurry Separation System (SST), providing an unique waste and biofuel solution depending upon your need. Our mission is to improve clean energy access, and provide sustainable solutions for energy and waste, leading Africa into its green energy future.
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Where You Can Find Green Heat



We have partnered with the Ugandan Ministry of Energy to provide sustainable energy solutions in schools. In 2014, we constructed ten bio-latrines to reduce reliance on wood fuel. Following the project’s success, Green Heat was commissioned to build ten additional bio-latrines in 2015. One of our largest projects to date was the installation of a 120m3 digester for the National Teachers College in Kaliro, Uganda.

Agriculture / Farming

Our projects range from supporting small scale farmers to waste management on an industrial scale. We are currently installing solar powered slurry separation systems for farms in East Africa. Our recent USAID grant from Securing Water for Food is financing technology to decrease water demands and enhance the production of organic fertilizer.

Residential Appications for Green Heat

Green Heat is committed to improving energy resources in African homes. We have installed over 150 domestic biogas digesters and 40 kilns for briquette production. We are also expanding our access to finance schemes to increase the distribution of solar lamps. We recently installed a biodigester for a 70 year-old woman who has been collecting firewod every day for years. Despite her doubts, she now has a gas stove fueled by the pig waste from her farm.



Green Heat works with businesses to offset carbon and give back to local communities.
This year we had the pleasure of working with Walt Disney Studios, during their filming of Queen of Katwe. We won the design bid to construct a large-scale bio-digester for the new school they have funded in the Namuwongo slum of Kampala.

Here To Serve You


Vianney Tumwesige

Vianney started Green Heat from its grass roots origins in 2006. His entrepreneurial drive combined with innovative approaches has lead to the company’s success today.


By compressively designing and delivering waste management systems, Vianney has gained an array of technical and project management experiences. Driven by his passion for renewable energy, Vianney’s AFRI-FLAME research into improving the efficiency of biogas digesters and biomass stoves shall soon earn him a Ph.D. from The University of Aberdeen.

Gabriel Okello

Gabriel has a leading role within Green Heat, implementing biogas installation, environmental consultancy and briquette manufacturing. His interests are in occupational hygiene, household air pollution and waste management. He has pioneered bio-latrine digesters in schools for Uganda’s Ministry of Energy. He has delivered biogas digesters under the AFRI-FLAME project and set up numerous briquette kilns and clean cook stoves across sub-Saharan Africa.


Gabriel is also conducting research on human exposure issues associated with burning traditional biomass under the BREATHE-Africa partnership, a research piece that shall earn him a Ph.D. from The University of Aberdeen. Additionally, Gabriel is leading the implementation of the innovative Solid-Liquid Separation technology, which will help farmers save water and grow more food. His experience in environmental chemistry and renewable energy research has enabled him to collaborate with NGO’s, government departments and multinational companies for the advancement of renewables in Sub-Saharan Africa.

Dorothy Kyomugisha

Very strong customer focus with highly structured and organized working methods. Dorothy is responsible for ongoing support to existing clients on the company’s products and services to form and grow advisory relationships. She also contributes to the company’s mission of helping clients increase revenue, reduce costs, and reinvest in innovation with proven technologies. Comfortable in interacting, reporting and presenting on all levels of hierarchy.