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

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

    Gas water heaters cost between $600 and $2,700 to replace, for an average cost of about $1,650. Electric water heaters cost between $600 and $3,500 to replace, for an average cost of about $2,100 ...

  3. Energy Prices Are High—And These Tankless Water Heaters Can ...

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    Tankless water heaters run on gas or electric, so we’ve consulted our guide listing the best tankless water heaters to give you a cost-effective option for each.. The Rheem RTEX-18 is one of the ...

  4. 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]

  5. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    Tankless water heaters provide many advantages: [8] Long term energy savings: Though a tankless water heater typically costs more initially, it usually costs less to operate because of lower energy use—since it only heats water when required instead of continuously maintaining a tank of heated water. Even homes or buildings with high demand ...

  6. Energy factor - Wikipedia

    en.wikipedia.org/wiki/Energy_factor

    The energy factor metric only applies to residential water heaters, which are currently defined by fuel, type, and input capacity. [5] Generally, the EF number represents the thermal efficiency of the water heater as a percentage, since it is an average of the ratio of the theoretical heat required to raise the temperature of water drawn to the amount of energy actually consumed by the water ...

  7. Mechanical, electrical, and plumbing - Wikipedia

    en.wikipedia.org/wiki/Mechanical,_electrical...

    In special cases, water cooling/heating, humidity control or air filtration [5] may also be incorporated. For example, Google's data centres make extensive use of heat exchangers to cool their servers. [6] This system creates an additional overhead of 12% of initial energy consumption.

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