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2. Own a pool in Southern California? New air-quality rule ...

   www.aol.com/news/own-pool-southern-california...

   The rule will lead to the replacement over three decades of more than 1 million gas-burning appliances — including an estimated 700,000 pool heaters and 300,000 tankless water heaters — with ...

3. Swimming pool - Wikipedia

   en.wikipedia.org/wiki/Swimming_pool

   Swimming pool heating costs can be significantly reduced by using a pool cover. Use of a pool cover also can help reduce the amount of chemicals (chlorine, etc.) required by the pool. Outdoor pools gain heat from the sun, absorbing 75–85% of the solar energy striking the pool surface.

4. How Much Does It Cost to Replace a Water Heater? - AOL

   www.aol.com/much-does-cost-replace-water...

   Electric water heaters cost between $600 and $3,500 to replace, for an average cost of about $2,100. However, many states are phasing out gas water heaters in favor of electric water heaters, so ...

5. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Fluid from water storage tank to external (passive) heat source; ... At $1 per therm, the cost of the gas would be about 40 cents. In comparison, a typical 230 L (60 ...

6. Industry Hills Aquatic Club - Wikipedia

   en.wikipedia.org/wiki/Industry_Hills_Aquatic_Club

   Thus, other much more expensive petroleum was necessary to fuel the pool heaters' boilers. Directly prior to closure, the Pacific Palms carried $220,000 in debt for just one year of operation. [ 4 ] Concurrent with the complete demolition and removal of the swimming pools, the Pacific Palms also chose to completely remove the 17 tennis courts ...

7. Heat pump - Wikipedia

   en.wikipedia.org/wiki/Heat_pump

   In general, heat pumps work most efficiently (that is, the heat output produced for a given energy input) when the difference between the heat source and the heat sink is small. When using a heat pump for space or water heating, therefore, the heat pump will be most efficient in mild conditions, and decline in efficiency on very cold days.