The higher the solar fraction, the greater the solar contribution to water heating, which reduces the energy required by the backup water heater. The solar fraction varies from 0 to 1.0. Typical solar factors are 0.5â0.75. Don't choose a solar water heating system based solely on its energy efficiency.
Price of a Stamp. The current price of a first class stamp is 49 cents. A domestic first class letter (1 oz.) is 49 cents. The price of each additional ounce is 21 cents. It will cost you 34 cents to send a domestic postcard.
Image caption A first-class stamp currently costs 46p and a second-class stamp costs 36p. A first-class stamp will rise in price from 46p to 60p from 30 April after the regulator lifted some price controls on Royal Mail. A second-class stamp will go up from 36p to 50p - some 5p below the top price allowed by Ofcom.