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

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

   According to Angi's data, the average cost for a water heater is $1,200, but the overall cost can range depending on whether you go with a tank or tankless system and need any additional plumbing ...

3. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Gas tankless water heater (Taiwan) On the other hand, tankless water heaters also have some disadvantages: [9] Startup costs: Beyond the 2x-4x larger initial purchase price (as compared to a tanked water heater), installing a tankless system comes at an increased cost, particularly in retrofit applications. They tend to be particularly ...

4. Reliance Home Comfort - Wikipedia

   en.wikipedia.org/wiki/Reliance_Home_Comfort

   In addition to water heater rentals (and sales in some areas), Reliance sells, rents, installs, and maintains furnaces and air conditioners. [1] It also offers maintenance and repair plans for heating and cooling systems, as well as for plumbing and electrical systems. [16]

5. 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 ...

6. Water heat recycling - Wikipedia

   en.wikipedia.org/wiki/Water_heat_recycling

   Installation of a double-walled copper-on-copper heat exchanger in a vertical section of the master drain line in a Canadian home (2007) Water heat recycling (also known as drain water heat recovery, waste water heat recovery, greywater heat recovery, [citation needed] or sometimes shower water heat recovery [citation needed]) is the use of a heat exchanger to recover energy and reuse heat ...

7. District heating - Wikipedia

   en.wikipedia.org/wiki/District_heating

   The Spittelau incineration plant is one of several plants that provide district heating in Vienna, Austria. Animated image showing how district heating works. District heating (also known as heat networks) is a system for distributing heat generated in a centralized location through a system of insulated pipes for residential and commercial heating requirements such as space heating and water ...