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2. Yes, Costco Sells Hot Tubs and You Need One ASAP - AOL

   www.aol.com/yes-costco-sells-hot-tubs-013400451.html

   Price tag: $2,999.99 (currently $400 off!) Dimensions: 61 in. x 70 in. x 32 in. Accommodates: 3 people Average rating: 4.6/5 This 20-jet hot tub is the quickest plug-in option for your backyard ...

3. 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 ...

4. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   A BTU is the energy required to raise one pound of water by one degree Fahrenheit. A US gallon of water weighs 8.3 pounds (3.8 kg). To raise 230 L (60 US gal) of water from 10 °C (50 °F) to 50 °C (122 °F) at 90% efficiency requires 60 × 8.3 × (122 − 50) × 1.11 = 39,840 BTU. A 46 kW (157,000 BTU/h) heater, as might exist in a tankless ...

5. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power. There are also heaters that use several single-phase circuits instead.

6. Uniform Swimming Pool, Spa and Hot Tub Code - Wikipedia

   en.wikipedia.org/wiki/Uniform_Swimming_Pool,_Spa...

   Designated as an American National Standard, the Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems associated with swimming pools, spas and hot tubs as a means of promoting the public's health, safety and welfare.

7. Storage water heater - Wikipedia

   en.wikipedia.org/wiki/Storage_water_heater

   A storage water heater, or a hot water system (HWS), is a domestic water heating appliance that uses a hot water storage tank to maximize water heating capacity and provide instantaneous delivery of hot water. [1] Conventional storage water heaters use a variety of fuels, including natural gas, propane, fuel oil, and electricity.