Despite the solar thermal is found to be considerably higher than in PV, remains much less common. The problem may be uncertain regulatory incentives
It is six times more efficient than a photovoltaic system. Provides hot water and heating from renewable sources. It will pay for itself within 3-10 years. A solar thermal system is a winning investment, provided you learn to correctly choose the features.
The main choice when you want to install a solar thermal system for domestic use is its purpose: "You just want to get hot water, or even space heating?
This evaluation is performed by the client, based on the budget and the energy-saving targets, with the advice of the engineer is asked to build the facility, which considers consumption and characteristics of the building.
More rising consumption, the greater the convenience of a solar thermal system with both features, thus making it possible to keep the boiler off completely even in the cold months of the year. The costs, however, increase accordingly. "For a family of four usually serves a facility that occupies an area of about 1 square meter per person, and then 4 square meters in all, if you just want hot water. To get even heating, you can get to 10 square meters. " Costs vary greatly depending on the quality of the components installed. It starts from a minimum of 800 euro per square meter to get up to 1,500 Euros. A plant from 4 m2 can then cost from 3,200 to 6 thousand euro, as you climb in 8000 to 15,000 euro for one 10 m 2. "A plant that costs more works better, is more efficient and lasts longer," says the expert. Look for savings at all costs, in short, can be counterproductive, partly because lower efficiency does is lengthen the amortization period determined by the savings in the bill.
Despite all the advantages and greater efficiency than the PV (the cost / energy produced is 6 times better), solar thermal versa in Italy for two years in a phase of stagnation. According to the latest report from the European solar thermal industry federation (Estif), at the end of 2011, the new installed capacity was reduced by 15%, from 500 thousand m 2 in 2010 to just over 415mila m 2 (for a total power of 290 MWth) . The fault, according to the analysis, resides mainly in the 'regulatory uncertainty regarding the incentives. If you install a solar thermal system, in fact, enjoys a deduction of 55% spread over 10 years (less desirable, therefore, compared with the rates approved by the Energy Accounts to photovoltaics) and to fall to 50% from 1 January 2013 until June 30. The incentives have been extended from year to year, with a short-term regulation that has left a long time the market uncertainty. To date it is waiting for an Account thermal energy that drives the guidelines for the months to come, according to initial rumors, the budget for the incentives indicated in early drafts of the decree, however, would be limited to only 700 million euro.
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