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R.O.I. is the return of investment of the project
It would be great if gas was always going to be a $1 liter or electricity 0.08$/kWh, but we have seen periodic price spikes in energy cost more than 10 times the inflation rate and the price of natural gas . Also consider that the capital investment and reduced operating cost of a solar hot water system installation will often pay back at resale! Finally, in this day and age it's impossible to put a price on environment. The extra electricity we consume and fossil fuels we burn
The return on investment (ROI) of a solar water heater depends upon the solar resource, local incentives, and to a lesser extent, the climate. Solar water heaters work best in areas with mild climates and lots of sunshine. They will work in cold, cloudy climates but the ROI is not as attractive. Many states and utilities have instituted incentive programs in addition to the 30% federal tax credit.
refer to a solar air heating
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