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In page Solarwall:

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Compared to traditional roof-mounted solar thermal panels designed to heat domestic hot water, a vertical orientation eliminates any snow buildup and was found to increase winter solar gain, being angled more towards the lower winter solar angle. Reflective snow on the ground was found to increase solar energy as much as 50%.[citation needed] SolarWall systems are typically installed without thermal storage to minimize costs and thus operate as day time heaters on commercial, industrial and institutional buildings