How to Build a Water Heating Solar Panel at self

солярную панель для обогрева воды- собствеными руками READ IMPORTANT UPDATE BELOW: I built a solar water heating system. In this video I show you how I built the water heating solar panels. My current system of twenty panels have the capability to collect 500,000 BTU per sunny day. typically I collect about 300,000 BTU, Still that is enough to easily heat our house for a day The panels cost about $450 to $500 each to build. Still that is much cheeper than buying them off the open market. UPDATE: The sec