-Solar heating panels save money because no fuel is needed to heat the water
-But they are expensive to buy and install
-Suppose you pay £2000 to buy and install a solar pannel and you save £100 each year on your fuel bills. After 20 years you would have saved £2000
-In other words, the payback time for the solar panel is 20 years.
-This is the time taken to recover the up-front costs front costs from the savings on fuel bills
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