In household and commercial usage, most water heaters in North America 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 liters (20 to 100 U.S. gallons). These may use gas, electric, propane, solar and heating oil.energy Natural gas heaters are most popular in the US and most European countries, since the gas is often conveniently piped throughout cities and towns and currently is the cheapest to use. Compared to tank-less heaters, storage water heaters have the advantage of using energy (gas or electricity) at a relatively slow rate, storing the heat for later use. Larger tanks tend to provide hot water with less temperature fluctuation at moderate flow rates.
Storage water heaters in the United States are typically vertical, cylindrical tanks, usually standing on the floor or on a platform raised a short distance above the floor. Storage water heater tanks in Spain are typically horizontal. In India, they are mainly vertical. In apartments they can be mounted in the ceiling space over laundry-utility rooms.
With most water heater inspections you will find missing earthquake strapping. Vet flue in contact with combustible surfaces. Gas leaks around gas valves and fittings. Back drafting of CO gases. Rusted or leaking supply fittings. Missing TPI valve and down piping, just to name a few.
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