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2. Limescale - Wikipedia

   en.wikipedia.org/wiki/Limescale

   Limescale - Wikipedia ... Limescale

3. Descaling agent - Wikipedia

   en.wikipedia.org/wiki/Descaling_agent

   Limescale build-up inside a pipe reduces both liquid flow and thermal conduction from the pipe, so will reduce thermal efficiency when used as a heat exchanger. A descaling agent or chemical descaler is a liquid chemical substance used to remove limescale from metal surfaces in contact with hot water, such as in boilers, water heaters, and kettles.

4. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   Water heating - Wikipedia ... Water heating

5. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   Hard water - Wikipedia ... Hard water

6. Water softening - Wikipedia

   en.wikipedia.org/wiki/Water_softening

   Water softening - Wikipedia ... Water softening

7. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Gas water heaters have an exhaust vent or one to two exhaust pipes on the top, and still require electric power for electronics, sensing and ignition. A three-phase, 21 kW, 400-volt tankless water heater in Europe, with new European color coding for three-phase power. There are also heaters that use several single-phase circuits instead.