Sacrificial anode.
It is probably sewer gas or something coming up from the drain.
Because the hot water heat transfers into the rod.
Follow Some steps for remove magnesium rod in hot water heater.1 Turn off water and fuel supply (gas or electricity) to water heater.2 Partially drain the water heater.3 Locate the anode rod on the water heater; if necessary, unscrew and lift off the cover from the top of the heater.4 Use a ratchet wrench and 1 1/16-inch deep socket to unscrew the anode rod from the heater.5 If the anode rod won't budge, slip a steel pipe onto ratchet wrench handle for extra leverage.6 Lift out and discard the old anode rod.7 Wrap Teflon tape around threads of new anode rod; insert anode rod into water heater and tighten with 1 1/16-inch socket.8 If limited space above the heater prevents the installation of a standard anode rod, install a collapsible type.9 Turn on the water and fuel supply to the water heater.alliedallcityinc.com
Has it been 6 years sense you checked your anode rod. If it is deteriorated this can cause an odor. If the tank is old, this can also cause an odor. Read your manual oh how to check your anode rod, or go online to the MFG website and read it, also look in the troubleshooting section for odor. There could be a answer for cleaning your tank.
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Brown-tinted water appearing when the drain faucet on a water tank is opened is normal. The brownish water is created by dissolved mineral and metal sediment collecting at the bottom of the hot water tank. This sediment creation is a normal function of the hot water heater heating the water and is released when you open up (or drain) the tank. Draining the tank should be done on a periodic basis - I drain my hot water tank every 6 months. Draining lessens the mineral/sediment buildup and helps extend the life of your hot-water heater.
All hot water tanks have rust after 4-5 years. If you are a sensible homeowner, drain and clean it every 3-4 years. You first turn OFF the power to tank, now remove the anode rod, ( a large bolt head on top of the tank, attached to what may remain of your rod) . then attach a hose pipe to the bottom fitting, lead it outside or to any drain, turn on the valve by it, turn OFF your inlet valve and open the relief valve so air can enter the H/W tank. Let the whole tank empty -takes about 30 -40 minutes. Next, when empty turn ON the inlet valve and let cold water run through the tank and out the hose, now you will see the sludge coming out. Let this run 5-7 minutes or until water is coming through clean. Now you are done . Let it fill, and fit new anode rod as it fills ( weight of the water helps) then turn on power when full.
If it is the common type with a float (big empty bulb) on the end of a rod, rotate the rod or bend it to make the float sit igher. The water will have to come higher in the tank to raise the rod high enough to shut of the water.
When did they make the first hot-rod
Water heaters can operate without an anode rod. If tank is not made of steel, then no anode rod is present. If tank is made from steel or glass-lined steel, then anode rod is necessary for long life of tank. Without anode rod, water will rust tank causing leaks and possible failure where tank bursts open and floods house until water is turned off. Anode rods are made of lower noble metals than steel water heater tank. When the two metals are connected together, water reacts with lower noble metal first, so the water dissolves anode rod instead of rusting tank. Anode rods should be checked every two-four years, more frequently when water is softened. Factory-made, gas and electric, steel water heaters come with one or two anode rods installed. Tanks with longer warranties generally have two anode rods. Check manual for specifics. Adding a second anode rod can prolong life of water heater. Ship hulls and propellers, and steel bridges, and other structures that come in contact with water also have anode rods.
What type of thermostat (there are several, the commonest is a rod)?
Hot Rod TV - 2006 SkySkrape Builds a Hot Rod was released on: USA: 18 June 2012