THERE have been recurrent phone calls in the house of Suparmin Sinuang Raharjo in the last few weeks. Callers generally have the same purpose: to order stoves of his own design. Over a dozen orders are placed daily. People ranging from entrepreneurs to herbal medicine sellers are all very much eager to bring home the stoves promised to be really energy-saving. A housewife, for instance, rode her motorbike from Magelang while carrying Rp3 million