Part of the Stelrad Radiator Group Stelrad has been part of the Stelrad Radiator Group (SRG) since 2014. With no fewer than 6 million radiators sold and a market share of around 20%, SRG is the only European manufacturer to focus 100% on the development, production and sale of radiators. Being part of this European group gives us the foundations and strength we need to consolidate and further strengthen our European position.