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16 Domestic water heaters
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Tank water heaters 219 Reversed connection 219 Relief valve 220 Rumbling noise 222 Exhaust stack 222 Operational inspection 223 Water heater replacement 224 Water heater capacity and recovery 225 Tankless coil water heaters 226 Inspection procedure 228 Indirect-fired storage water heater 228 Checkpoint summary 229
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Hot water for bathing and washing (domestic hot water) is produced through a separate tank-type water heater, through the heating-system boiler (steam or hot water) by a tankless coil, or through an indirectfired storage water heater. Domestic hot water is considered by manufacturers as cold water whose temperature has been raised 100 F. An important consideration in the design of water heaters is the ability of the unit to raise the temperature of 1 gallon of water 100 F. This criterion is used in evaluating the recovery rate for tank heaters and the water-flow rate for tankless coil heaters. These items will be discussed in the sections that follow. The temperature of domestic hot water is important for energy conservation and safety. The operating temperature range for most
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water heaters is between 120 F and 160 F, although in some cases it is possible to achieve temperatures of 180 F. Normally, a thermostat setting that produces a water temperature of 140 F will be adequate for household chores, including the use of automatic clotheswashers and dishwashers. However, for washing dishes by hand or bathing, temperatures of 120 F are more than adequate. In fact, a 120 F water is above the tolerance level of most people and will have to be mixed with cold water. Setting the thermostat so that the water temperature exceeds 140 F is wasteful of energy and will shorten the life of the water heater. In addition, a water temperature in excess of 160 F is a potential hazard because of the possibility of being scalded while showering (if the mixing valve should be faulty).
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218 Domestic water heaters
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Most tank water heaters are located near the heating system or in a utility room, sometimes in the kitchen or a closet. These heaters basically consist of a lined steel tank that is covered with an insulated sheet-metal jacket to reduce heat loss. The lining in the tank is usually vitreous enamel (glass) but can be concrete (stone) or copper. To minimize tank corrosion, most heaters are equipped with a sacrificial magnesium anode rod that is suspended inside the tank. The electrochemical action causing corrosion takes place between the water and the anode rather than between the water and the tank, thereby extending the life of the tank. Some tanks are constructed so that the magnesium anode can be inspected and replaced if necessary. Tank water heaters are gas- or oil-fired or electric. (See FIG. 16-1.) Reversed connection Many water heaters have at the top of the tank hot-water outlet and cold-water inlet fittings
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that are clearly marked HOT and COLD, respectively. Yet it is surprising how many times I have found heaters with a reversed water-line installation. You can tell whether the installation is reversed by touching a pipe about 4 feet away from the unit and comparing it with the HOT outlet fitting on top of the tank. A reversed connection results in an inefficient operation of the heater. Even though there is a cold-water inlet tap at the top, the cold water does not enter the tank at the top. There is a pipe (dip tube) inside the tank connected to the inlet fitting that carries the cold water to the bottom of the tank. Because the hot water tends to rise above the cold water, the hot water is normally at the top of the tank where it flows through the outlet fitting. When the inlet-outlet connection is reversed, the cold water enters the tank at the top and mixes with the hot water as it settles to the bottom near the outlet fitting. Consequently, for the same thermostat setting, the temperature of the hot water is lower than it would otherwise
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