Solar Heating

To heat the hot water in a residential building, is it useful?
is an explanation please (and not just yes or no)

A Yahoo search for "solar water heaters" (include the quotes in the search box) yields 329,000 results. If you do the same search, and are willing to spend a little time exploring, I'm sure you'll quickly find the information you are looking for.

Good luck with your search.

It depends on where you live. If you live where it is covered many days, like Seattle, it would probably not woth the expense. If you live where you get lots of sun, such as Arizona and then finally pay for itself.

If it was a good deal, it would be generally available in new construction, and there would be a thriving industry that retofitting existing housing. I have not seen either. I think it's just a "nice" idea yet.

It has been a BBC Radio 4's debate today on companies that sell solar panels to heat water. The companies are guilty of selling hard and pulling customers. Charging around £ 7,000 for a system to heat a tank of water, which, when the sums are calculated would take more than 25 years before obtaining a cost advantage.

These companies are known to sell their systems, even those who have a combination boiler, making the solar system completely useless from a reservoir of water is necessary for this to work. They do not provide technical information and mislead the customer just to get a sale.

If you "invite" these companies in your home, you are ineligible for a period of reflection, whereby up to seven days (I think), you can cancel the contract if you change your mind after signing your home. In addition, if they sell under false pretenses of the specification, they will not reimburse the customer until the dispute is brought against them.

Be very careful of companies in this industry.

To carry out engineering calculations would be too expensive for this forum.

What you spend on construction costs - you get in about 2-3 years.

The English climate is not very conducive, so it is not viable

Nah.

no