Sales soar for energy saving devices to keep warm and heat food as alternatives for conventional … [+] ovens, central heating and tumble dryers Photo: Philipp Schulze/dpa (Photo by Philipp Schul...
Sales soar for energy saving devices to keep warm and heat food as alternatives for conventional … [+] ovens, central heating and tumble dryers Photo: Philipp Schulze/dpa (Photo by Philipp Schul...