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2. 11 Reasons Why Your Water Is Only Lukewarm - AOL

   www.aol.com/11-reasons-why-water-only-171300843.html

   This type of water heater could be 24% to 34% more energy-efficient than a traditional water heater, according to the Department of Energy. Tankless water heaters can also save space, as they don ...

3. Tips for troubleshooting water heater issues - AOL

   www.aol.com/tips-troubleshooting-water-heater...

   Your hot water heater is complicated. But not so complicated that you can expect ice-cold showers to become part of your routine. If your hot water heater isn't working, click through to learn how ...

4. Is your heater making you sick? How to avoid cold-like ...

   www.aol.com/lifestyle/heater-making-sick-avoid...

   Using distilled or demineralized water in your humidifier can reduce the buildup of scale and the release of dust. Clean your home regularly Dust and allergens in the home can trigger sneezing ...

5. Automatic bleeding valve - Wikipedia

   en.wikipedia.org/wiki/Automatic_bleeding_valve

   The valves are normally installed with the first installation of a system, then remain in place for the life of the system. They are generally reliable and require no maintenance. If they do eventually fail, they are replaced rather than repaired. A leaking valve commonly shows a dribble of water from the air vent, or stains of rust or limescale.

6. Condensing boiler - Wikipedia

   en.wikipedia.org/wiki/Condensing_boiler

   Condensing boilers are water heaters typically used for heating systems that are fueled by gas or oil. When operated in the correct circumstances, a heating system can achieve high efficiency (greater than 90% on the higher heating value) by condensing water vapour found in the exhaust gases in a heat exchanger to preheat the circulating water.

7. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   The result of automatically mixing hot and cold water via a tempering valve is referred to as "tempered water". [14] A tempering valve mixes enough cold water with the hot water from the heater to keep the outgoing water temperature fixed at a more moderate temperature, often set to 50 °C (122 °F).