The panels are guaranteed for 25 years and require almost no maintenance. Since they have no moving parts, they make no noise. In addition, they do not produce any smoke or anything else.
The same goes for air collectors. The famous Solarwall collectors or other types of air collectors require no maintenance. They do not freeze, they do not overheat in the summer, and the only moving part is a small fan. Only water systems require maintenance, and the Canadian industry has no training to do this. The local plumber would not know what to do with a system of this type, which requires having specialized training.
If the objective is to provide 22% of the hot water needs to the industries that require it, that is entirely possible. So maintenance is simply something that does not need to be taken into account for the institutional and industrial sectors. A solar system does not require more maintenance than a hot water heater in order to produce hot water, certainly not in the institutional sector.