Water heater information

Sediment buildup

In a water heater the heating of water causes calcium carbonate to precipitate out and settle to the bottom of the tank. Steam bubbles can form under the sediment when the burners come on causing popping and other noises. It can also reduce the amount of water your tank holds. Regular flushing will help prevent sediment build up. 

Not producing enough hot water

Check for a broken dip tube, wrong setting on a thermostat, a defective thermostat, burned out heating elements (electric), or a heavy build up of sediment. 

Dip tube

The dip tube is a long slender tube that fits down into the water heaters  inlet, and usually has a small hole about 6 inches from the top. The dip tube directs the incoming cold liquid down to the bottom of the tank.  If the dip tube is broken, the incoming cold liquid can mix with the out going hot water and cause it to seem as though you are running out.

Noisy tank

Noise coming from gas models can often be caused by the sediment build up in the bottom of the tank. Steam bubbles form under the sediment. The thumping and popping noises are created by the bubbles escaping from under the sediment.  Sizzling noises can be caused by condensation dripping onto the hot burner.

Thermal expansion

When water is heated it expands. If the inlet is not blocked by a check valve, pressure reducing valve, or other device, the increase in volume simply travels back into the source. If the inlet is blocked, this increase in volume will cause an increase in pressure, sometimes to dangerous levels. 

The T&P (Temperature-pressure) valve relieves this pressure by discharging some water.  A thermal expansion tank can be installed in the line that will absorb the increase in volume, preventing the relief valve from discharging unnecessarily.

T&P valves are strictly an emergency measure and should be replaced every 2 years.  At 180 degrees, the temperature that the T&P valve opens, damage can occur to your system and you may have voided the warranty on your water heater.

The improper installation of backflow preventers can block the thermal expansion leading to operation of the T&P Valve.

Water Hammer

When water is traveling in the pipes it has kinetic energy (energy of motion).  When a valve shuts off suddenly and stops the moving water, a shock wave results. 

Water hammer most often occurs when a valve shuts off suddenly.  Commercial arrestors are available to combat this problem.  They consist of a small air bladder within a cylinder plumbed to the piping system near the valve causing the problem.  Some hardware stores carry them. 

Sometimes if the piping is sagging then supporting the pipe solves the problem.

Milky color

Water contains dissolved oxygen and other gases.  When it's heated it has less ability to hold these gases and when the pressure is lowered  as the water comes out of the tap these gasses can form tiny bubbles giving the liquid a milky appearance.  Letting it stand for a few minutes will allow these bubbles to rise out of the liquid and it resumes its clear appearance.

If you live in an earthquake prone area then be sure to strap the tank to the wall to prevent damage and possible injury during an earthquake.

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