Whats the best collector tilt angle?
The best solar collector tilt angle (from horizontal) for space heating is equal to your location’s latitude + 15 degrees. However collector tilts equal to your latitude to 90 degrees (wall mount) is generally acceptable. When there is snow is often on the ground in front of the collector to reflect sunlight onto the collect, then mounting on a wall (90) is especially great. Wall mounting collectors is generally the least expensive, especially for adjacent, direct room heating, but is the most susceptible to shading. For roof mounts, to shed snow, we recommend an angle no less than 40-45 degrees (aka. 10:12 to 12:12 pitch), no matter what your latitude is (see the Latitude Finder link in the Links section).
