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2. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Tankless water heating. The inside of a hydraulically operated two-stage tankless heater, heated by single-phase electric power. The copper tank contains heating elements with 7.2 kW maximum power. Tankless water heaters — also called instantaneous, continuous flow, inline, flash, on-demand, or instant-on water heaters — are water heaters ...

3. 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.

4. List of SMTP server return codes - Wikipedia

   en.wikipedia.org/wiki/List_of_SMTP_server_return...

   X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 . A server capable of replying with an Enhanced Status ...

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

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

   And while you can switch, this is largely determined by what kind of power your old system ran on. Gas water heaters cost between $600 and $2,700 to replace, for an average cost of about $1,650 ...

6. Google will replace Nest thermostats affected by 'w5' WiFi error

   www.engadget.com/google-replace-nest-w5-wifi...

   Nest. Google is very much aware that some Nest thermostats are suffering from a “w5 error” that prevents them from connecting to WiFi, according to Android Police. In a statement sent to the ...

7. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   The main disadvantage is their much higher initial costs; a US study in Minnesota reported a 20- to 40-year payback for the tankless water heaters. [citation needed] In a comparison to a less efficient natural gas fired hot water tank, on-demand natural gas will cost 30% more over its useful life. [dubious – discuss] [citation needed]

8. This in-home water recycler is meant to help the planet, and ...

   www.engadget.com/2020-01-08-hydraloop-home-water...

   At $4,000 per unit, Hydraloops aren't exactly cheap, but those recurring monthly water savings should help recoup that initial investment over time. And honestly, with the earth in the condition ...

9. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   A backflow prevention device is used to protect potable water supplies from contamination or pollution due to backflow . In water distribution systems, water is normally maintained at a significant pressure to enable water to flow from the tap, shower, or other fixture. Water pressure may fail or be reduced when a water main bursts, pipes ...