Domestic hot water preparation systems based on solar collectors are an environment-friendly solution because:
· they do not have a negative impact on the environment,
· they make it possible to tap into the unlimited resources of renewable energy,
· they do not pollute the environment,
· they do not require fuel supply or storage, they are clean and convenient.
Solar energy, one type of alternative energy sources, is the “cleanest” kind of energy from the environmental perspective.
The environmental effect achieved as a result of installing 2349 solar systems is described by the value of emissions prevented, as presented below: