1. Maintenance Concern
Although most systems don't require excellent care, maintenance is one drawback. However, scaling happens when there are suspended minerals in household water, which cause calcium deposits to form in the system. Scaling can be prevented by using water softeners or mildly acidic chemicals like vinegar. Depending on the water quality, it only needs to be done every three to five years.
Another issue is corrosion. Oxygen can rust any iron or steel component in open-loop hydronic solar systems. Plumbing parts composed of copper, brass, bronze, stainless steel, plastic, or rubber are more durable. Storage tanks should have a glass or plastic lining to prevent corrosion.
Active systems may also overheat if the storage tank is too small for the collector. The usual rule is that there should be 1.5 gallons of storage for every square foot of collector. By keeping that in mind, a disadvantage like that can be avoided.
4. Limited Heating Hours
Heating can only be acquired during the daytime. It doesn't follow that hot water won't be accessible at night. Water heated throughout the day can be used at night by maintaining the temperature in an insulated storage tank, but without one, this may cause a problem without one.
Cost may also be a downside. Comparing solar water heating systems to other water heaters, they are frequently more expensive to buy and install. The long-term benefits result from lower water heating costs, which can be cut by up to 80%. Worrying about price increases, fuel shortages, or other problems with utility-based heating is also unimportant.