Hecal Primus boilers are designed for central heating of small residential or commercial buildings where water-heating systems installed. The operated with mechanical thermostat, which enables to adjust both primary and secondary air inlets automatically by the help thermostatic valve. ...

Most families in rural China cook and heat their homes using stoves that burn coal or wood. Domestic energy use is a significant contributor to deforestation greenhouse gas emissions. Coal particular leads dangerous levels of indoor air pollution, contributes the poor outdoor quality much as ...