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

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

    The dry air produced by heating systems can irritate your nasal passages and throat, which can in turn cause discomfort, Lizarzaburu adds. Dry air can also make it harder to fight off colds.

  3. Tankless water heating - Wikipedia

    en.wikipedia.org/wiki/Tankless_water_heating

    A hybrid water heater is a water heating system that integrates technology traits from both the tank-type water heaters and the tankless water heaters. [5] It maintains water pressure and consistent supply of hot water across multiple hot water applications, and like its tankless cousins, it is efficient and can supply a continuous flow of hot ...

  4. Humus - Wikipedia

    en.wikipedia.org/wiki/Humus

    The latter looks rough and has visible remains of the original plant or animal matter. Fully humified humus, on the contrary, has a uniformly dark, spongy, and jelly-like appearance, and is amorphous; it may gradually decay over several years or persist for millennia. [14] It has no determinate shape, structure, or quality.

  5. Ondol - Wikipedia

    en.wikipedia.org/wiki/Ondol

    In contrast to heaters, such as fireplaces or charcoal-based heaters that leave ash in the room, an ondol does not cause pollution in the room leaving it clean and warm. [9] [10] The ondol has some disadvantages. Mud and stones are the main materials that make up the ondol. Such materials take quite a long time to heat up, therefore the room ...

  6. Plumbing - Wikipedia

    en.wikipedia.org/wiki/Plumbing

    A system of copper water tubes used in a radiator heating system. A water pipe is a pipe or tube, frequently made of plastic or metal, [a] that carries pressurized and treated fresh water to a building (as part of a municipal water system), as well as inside the building.

  7. Humic substance - Wikipedia

    en.wikipedia.org/wiki/Humic_substance

    "Humic substances" is an umbrella term covering humic acid, fulvic acid and humin, which differ in solubility. By definition, humic acid (HA) is soluble in water at neutral and alkaline pH, but insoluble at acidic pH < 2. Fulvic acid (FA) is soluble in water at any pH. Humin is not soluble in water at any pH.

  8. Hot water storage tank - Wikipedia

    en.wikipedia.org/wiki/Hot_water_storage_tank

    Water is a convenient heat storage medium because it has a high specific heat capacity. This means, compared to other substances, it can store more heat per unit of weight. Water is non-toxic and low cost. An efficiently insulated tank can retain stored heat for days, reducing fuel costs. [1] Hot water tanks may have a built-in gas or oil ...

  9. That rotten egg smell could be a gas leak. What can you do to ...

    www.aol.com/news/rotten-egg-smell-could-gas...

    Mercaptan is a harmless chemical that smells like sulfur or rotten eggs that utility companies add to natural gas to make it easier to detect leaks, according to Healthline, a medical information ...

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