Acme Plumbing & Heating

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Hot Water Heaters

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About Hot Water Heaters
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry both hot water and water heated to steam have many uses.

Instantaneous water heaters

Stand-alone appliances for instantaneously heating water for DHW (Domestic Hot Water) are known as tankless heaters.

Storage systems

Another popular arrangement where higher flow rates are required (although for limited periods) is to heat water in a pressure vessel capable of withstanding a hydrostatic pressure close to that of the incoming mains supply. (A pressure reducing valve is usually employed to limit the pressure to a safe level for the vessel.)

These vessels are known as tanks and may incorporate a gas or oil burner heating the water directly.

Where hot-water space heating boilers are used DHW cylinders are usually heated indirectly by primary water from the boiler, or by an electric immersion heater (often as backup to the boiler). When connected to a boiler they are known as indirect-fired water heaters.

Tank-type water heaters

A storage water heater
A storage water heater

In household and commercial usage, most water heaters are of the tank type. Also called storage water heaters, these consist of a cylindrical tank in which water is kept continuously hot and ready for use. Typical sizes for household use range from 75 to 400 litres (20 to 100 U.S. gallons).

References: Wikipedia

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