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Hot Water System Adelaide – Hot Water System Troubleshooting.

Posted by on February 7, 2017
Unlike tankless water heaters, standard tank-type hot water systems use an insulated storage tank. Water heaters are generally very reliable but occasionally they do have some problems. These problems can include:

  • No hot water
  • Insufficient hot water
  • Rust colored water
  • Rotten egg odor
  • Low rumbling or popping noise
  • Higher pitched whining
  • Water leaking around base of the hot water system

Before any troubleshooting is done, make sure to prepare safely for the job by doing the following:

  • Turn off power to an electric water heater system. Do this by turning off the circuit breaker or fuse powering the heater.
  • Turn the gas pilot control valve to “pilot” setting.
  • Shut off the water supply to the water heater.

Let’s take a look at each problem and what possible causes and repairs exist.

Hot Water System Adelaide – No Hot Water Flow

Possible Causes

  • Faulty gas pilot
  • Faulty gas thermocouple
  • Faulty gas pilot control valve

Possible Repairs

  • Check that the gas pilot flame and pilot is operational.
  • Re-tighten, reposition or replace the gas thermocouple.
  • Replace the gas pilot control valve.

Hot Water System Adelaide – Insufficient Hot Water

Possible Causes

  • Hot water system is undersized for water heating demands
  • Broken or damaged dip tube allowing cold and hot water to mix in the tank.
  • Faulty plumbing installation has crossed cold and hot water connections
  • Gas supply or control problems

Possible Repairs

  • Make sure the hot water system is not being overtaxed by hot water supply demands. The hot water system should have 75% of its capacity as hot water (e.g., a 40 gallon WH should be used for a demand of 30 gallons).
  • Undo the cold-water inlet and pipe nipple and remove dip tube. Check the condition and replace if required.
  • Check for crossed connection by turning off the water supply to the hot water system. Open a hot water faucet. If there is water flow, then there is a crossed connection somewhere. Check for a hot water line connected to a cold-water connection on the water heater or appliances such as washer, dishwasher, faucet or shower valves.
  • Check for a proper flame from the burner. A natural gas flame should be bright blue with the tip of the flame having just a tinge of yellow. A propane flame should have a bluish green flame with a tinge of yellow at the tip.

Hot Water System Adelaide – Rust Colored Water

Possible Causes

  • Corrosion occurring inside glass lined tank
  • Sacrificial anode rod is failing (anode rods dissolve slowly to prevent rusting in the tank)

 Possible Repairs

  • Replace the sacrificial anode rod with magnesium anode rod. Anode rods are available from a plumbing supply house.

Hot Water System Adelaide – Rotten Egg Smell

Possible Causes

  • Bacteria in the tank sediment fed from hydrogen gas created from decay of sacrificial anode.

Possible Repairs

  • Flush the hot water system using a hydrogen peroxide solution of 2 pints 3% peroxide to 40 gallons of water, treat tank and run some of the solution into water lines.
  • Let peroxide solution set in the tank and pipes for 2 hours. The Solution is not toxic and requires no rinsing.
  • If the problem persists, replace the anode with a zinc-alloy anode.
  • If the problem still remains, replace the hot water system with a plastic lined tank type.

Hot Water System Adelaide – Low Rumbling or Popping Noise

Possible Causes

  • Noise heard is the sound of boiling water. Excessive buildup of sediment in bottom of the tank is causing overheating of the tank bottom and boiling of water to occur.

Possible Repairs

Remove sediment by flushing the hot water system

Hot Water System Adelaide – Water Leak Around Base of Heater

Possible Causes

  • A faulty T&P (temperature and pressure) relief valve
  • The T&P valve leaks due to excessive pressure, overheating or is stuck
  • A leak from overhead or nearby plumbing connection
  • A leaking water tank (corrosion likely)

Possible Repairs

  • Place the bucket under overflow pipe. Open and flush T&P valve clear of debris. If the leak remains from the valve, replace the valve.
  • Reduce the thermostat setting to prevent tank overheating and opening T&P relief valve.
  • Inspect bottom of the tank by looking through the combustion chamber. If water marks or heavy rusting is noticed or if water is noticed setting in the combustion chamber bottom, then the water heater needs to be replaced.

 Get in touch with a professional plumbing business such as Adelaide 24 Hour Plumbing to service or replace your hot water system.

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