Question about Emerson Insinkerator 2.5 Gallon Water Heater - W152

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The water from the instant heater smells bad. I've changed the filter but the odor remains. What is this?

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  • carol_brandt Sep 08, 2009

    OK...that sounds good but how do I flush it? As you can guess....I'm not very knowledgeable about these kinds of things but I'll always give it a try.



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If the water supply from other outlets of the house are fine, the unit itself developed some mold or other contamination from period of non use. it will need to be flushed

Posted on Sep 08, 2009

  • bozcro
    bozcro Sep 08, 2009

    call a seviceman, specially if gas



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1 Answer

The hot water smells

1) Odors are caused by harmless bacterial reacting with anode rod.

2) If odor is in both hot and cold water, problem can be other causes.

Feb 07, 2013 | Whirlpool Water Heaters

1 Answer

I have a John Wood one pipe power vented hot water heater. The model number is Jw840nvh-fv-04. Recently I've been smelling products of combustion coming out the top of the tank where the vent is.

If this heater is located in a "confined space", has the "make up air" entry point(s) been restricted/blocked? In short, is there enough air present to support combustion AND to supply enough air for the power vent to move the gases at a reasonable rate to the environment?

Can you "feel" the gases coming out the vent at a reasonable thrust? Is the power vent blower motor making any noises (not rotating properly, i.e., bad bearings)? Does the vent have any debris at the end, possibly at a screen?

Is the T&P valve dripping water? Is there ANY water on the floor? Is there a thermal blanket on the heater? Is the blanket wet anywhere? Did you recently add a thermal blanket? (Some manufacturers DO NOT recommend a blanket.) Have any liquids been spilled on top of the tank? Is anything dripping on the tank?

Is the burner flame crisp, not "lazy"?

"Recently I've been smelling products of combustion coming out the top of the tank where the vent is". There is a negative pressure present at the top of the tank where the vent is - in a properly drafting vent pipe assembly. This means that vapors, odors, and moisture ARE BEING SUCKED OUT of that area under and through the hood and then into the piping. "and when blew some smoke at the vent, it drafted up through the vent no problem". Try to identify the real source of the odor.

Lastly, I think this model uses a direct connection technique from the blower/power vent termination to the piping without a hood. So if you blew smoke at the vent, and there is no hood, how would the smoke get into the vent? If the 2" vent is PVC or CPVC, and if the gases are being slowed because of any reasons mentioned, maybe the plastic piping is slowly cooking.

Feb 02, 2013 | Water Heaters

1 Answer

I have a John Wood one pipe power vented hot water heater. The model number is Jw840nvh-fv-04. Recently I've been smelling products of combustion coming out the top of the tank where the vent is

1) Copy following link for troubleshoot resources by type of gas control valve, Venting resources, and pro water heater forum:

2) This odor can indicate incomplete combustion due to lack of air supply. Get more fresh air to unit. Check that flame is clear blue color. John Wood is American/AO Smith product so air intake screen is located on bottom of unit. Use mirror and flashlight to inspect. Clean with compressed air ad or feather duster.

3) Jw840nvh is 40 gallon natural gas. Natural gas is lighter than air and rises upward, unlike propane gas that is heavier than air. Install gas detector at height correct for type of gas.

4) For safety, install CO carbon monoxide detector

5) Review product manual for correct vent lengths and diameters.

Feb 02, 2013 | Water Heaters

1 Answer

What is the purpose of the magnesium rod inside the water heater (bock)

These anode rods, sometimes made from aluminum, prevent corrosion. The rod emits ions that line the tank and help prevent corrosion. The rod isn't solid magnesium or aluminum; it has an iron core. If your hot water smells of sulfur (rotten eggs), the anode rod has gone bad or there is a presence of hydrogen sulfur gas that is overwhelming the rod. Usually replacing the rod will stop the odor, but sometimes chlorination of the tank is necessary.

Oct 25, 2011 | RTO Bock Water Heaters 32E 32 gal 104,000...

1 Answer

About every two months the the hot water gets a sour smell. To get the smell out I turn both elements all the way up for 3 hours then drain the water heater, its good for about two months. The water heater...

The smell is from bacteria. The high temperature kills the bacteria. Some regions require water heater temp to be set at 135 because of bacteria.

A test to determine if only the water heater is causing problem: Turn off water to water heater. Smell water coming out of cold tap. Turn on water to heater, smell water from hot tap. If only hot tap smells, then water heater is suspect.

Another way to handle the problem long-term, is to reconfigure cold water pipes so you can regularly pour in 2 bottles of hydrogen peroxide during your flushing procedure. Pour in the hydrogen peroxide and let it work for a while. And then flush tank as you have been doing.

You should read up on anode rods also. Many people replace anode rods when tank begins to get odor.

Oct 23, 2010 | Rheem 80 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Just rented a home in the country the water smells like rotten eggs

Hydrogen Sulfide Gas can occur in wells, and gives the water a characteristic "rotten egg" taste or odor.

  • Install an activated carbon filter. This option is only effective for low hydrogen sulfide levels, The gas is trapped by the carbon filter is saturated.
  • Install an oxidizing filter, such as a "manganese greensand" filter. Manganese greensand filters are often used to treat iron problems in water. The device consists of manganese greensand media, which is sand coated with manganese dioxide. The hydrogen sulfide gas in the water is changed to tiny particles of sulfur as it passes through the filter. The filter must be periodically regenerated, using potassium permanganate, before the capacity of the greensand is exhausted.
  • Install an oxidation-filtration system. These systems utilize a chemical feed pump to inject an oxidizing chemical, such as chlorine, into the water supply line prior to a storage or mixing tank. When sufficient contact time is allowed, the oxidizing chemical changes the hydrogen sulfide to sulfur, which is then removed by a particulate filter, such as a manganese greensand filter.
  • Aug 08, 2010 | Whirlpool Water Heaters

    1 Answer

    New hot water heater cause smelly hot water.

    U can clorinate ur water heater 1 gallon will do it. But you should try changing the anode rod(to aluminum) or removing it first followed by a complete drain, purge and refill.

    Mar 29, 2010 | Water Heaters

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