Can I install flat plate collectors on a roof with heavy snowfall?

Snow Load Considerations

When evaluating a roof with heavy snowfall for flat plate collectors, it’s essential to consider the snow load. The American Society of Civil Engineers (ASCE) recommends a minimum snow load of 20 pounds per square foot (psf) for flat plate collectors. If the roof’s snow load exceeds this threshold, it may be necessary to implement additional structural support or choose a different type of solar collector.

Collector Size and Angle

To mitigate the impact of snow on flat plate collectors, consider installing smaller collectors with a more pronounced angle (typically 30-50 degrees) to allow snow to slide off more easily. This design can help reduce the risk of damage and maintain system efficiency. For example, a 2x4 collector array with an angle of 40 degrees might be more suitable for a high-snow-load area than a larger, flat array.

Alternative Options

If flat plate collectors are not viable, consider using evacuated tube collectors or solar water heaters with a ground-mounted or wall-mounted design. These systems are less susceptible to snow damage and can be designed to withstand heavy snow loads. For instance, a well-insulated, ground-mounted evacuated tube system can provide reliable solar hot water performance even in areas with extreme snowfall.