Sigma's production process is ISO 9001: 2008 certified. The solar panels have been certified , since 2005 , with the highest distinction in solar panels, with the solar keymark , (ELOT ) and are constantly tested for their best quality and efficiency.
The solar water heater is an appliance that can be affected by the significant drop in temperature due to bad weather. The greatest risk for the water heater to be damaged is if it does not have the necessary amount of antifreeze.
Find the best solar water heater system in 5 steps.
The installation of the solar water heater offers complete independence from the electricity grid or the use of fuel. It can keep water hot even on cloudy or bad weather days, making our lives so easy.