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Low hot water output - Water Heaters

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Do you have a question on this?

You have a water heater that has woked well in the past and now the amount of hot water is diminished?

When was the last time your cleaned the junk out of the bottom? Do it now ... connect a hose to the bottom drain and lead the hose to a drain. Run the water until it is clear + 2 or 3 minutes.

Is this gas or electric? You have plenty of gas ... all other gas appliances work fine in your home?

Electric ... you could turn off the power and check that the elements still good. check contunity first then carefully - repeat - carefully - turn the power and check the voltages. should be 220 V ac

If it put out hot water before and now does not ... the elements are good ... still no hot water, could be the thermostat.

all speculation on my part because I dont know what your question is.

a

Posted on Oct 05, 2009

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1 Answer

No hot water,central heating is fine


Sounds like the output fitting has melted inside and clogged up the output pipe. These couplings are one way valves to keep water from draining backwards when not in use to keep from burning elements. They are plastic inside. I would turn off water and replace those after a visual inspect if needed.

Feb 20, 2013 | Water Heaters

1 Answer

Low water pressure


Hi Bob,

You can determine if the tank is the problem by connecting a garden hose to the drain that is provided on most water heaters. Before doing this, be sure to shut of the electrical supply to the heater - otherwise you can damage heating elements if an electric type or waste fuel by heating an empty tank if a gas / propane fired type.

If you get a slow flow out of this drain, it means that somewhere in the cold water supply side to / in the tank - there is a problem. Inside the tank, the cold water is delivered by a "dip tube" that distributes the cold water to the bottom in the tank. Dip tubes are used in both electric and gas / propane fueled heaters. Here's a cut away view of a typical tank:



6_29_2012_9_57_32_pm.jpg

If the tube is clogged, or there is build up, scale or debris in the supply (cold water) side of the heater, flow rates will suffer. Likewise, if there is a problem with the output of the tank, it will directly affect flow as well.

If you get a good flow rate from the drain, then the issue is going to be on the hot water output side of the heater. Again, the same build up, scale, debris issues on the hot water out put pipe will cause problems with flow. Typcial tanks do not have dip tubes for the hot water side of the tank - as taking hot water from the top of the tank is most desireable and is furthest away from the cold water that rushes in to make up the hot hot water going out.

There's nothing really in the tank itself that can cause issues with flow outside of the dip tube, and piping to and from the tank.

Good luck!

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1 Answer

Do the pink and blue inserts on the water lines stay in


If you are referring to the plastic plugs that are in the cold water supply (blue) and hot water output (red) lines, they are only there to keep any debris out of the lines before connecting, so pull them out and toss them.

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1 Answer

I recently had to change out my water heater. WIth the new one in hookied up I frequently get diminished water output. I did not have this problem before with the old unit. It was immediately apparent...


The question is unclear.
Diminished output could mean you have less less pressure on hot side and hot water barely trickles, or it could mean you have fewer gallons of hot water available.
The type of water heater is also unclear. Do you have gas or electric, or indirect or tankless or tank or power vent, or RV heater.
The label located on side of water heater is valuable source of information.
As a general rule the serial number is not important, but the type of heater and possibly model number are important. Serial numbers are used by manufacturer to identify your product, and also contain information about age of water heater.

Causes for less hot water.
Cold incoming water, thermostat set too low.
With gas heater, location can be issue if burner not getting enough air.
With gas: poor venting, or new furnace with power vent
Sediment in water lines, or clogged pipes, or clogged shut off valve could cause problems.
Defective parts can be a suspect.

Solutions: First of all, exact information must be included because nobody can see through walls without description from person who can see.
1) Re-post question with more details.
2) Add a comment to this post and I might have some answers.
3) Take advantage of fixy phone service. For a price, fixya expert speaks to you via phone to help isolate problem
4) Post a detailed question on professional water heater forum:
http://www.thetankatwaterheaterrescue.com/forums/forum3/

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1 Answer

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1) clogged aerator on your fixture - easily fixed by removing and cleaning the aerator with a pair of vice grips

2) clogged inlet filter for your tankless - the inlet filter is located on the incoming cold water connection. It has a black cylindrical cap. To remove it, make sure to first turn off your water to the heater and then unscrew the cap to remove the filter. Instructions can also be found in your owner's guide.

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It could be back flowing into the hot water heater tank which is not full because of the leak. Even though the valve is closed on the cold water entry side, there is probably no valve on the exit side. That is how it is returning to the tank.

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1 Answer

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