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My Hot water tank is not heating water and feels cold to touch

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It is probably broken and you should call someone to fix it

Posted on Jul 30, 2008

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Posted on Jan 02, 2017

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On our AE125, the thermal cut-off is tripping AFTER the water is turned off. The heating element is getting so hot you cannot touch it


The elements are getting over heated then set temperature.You have a defective thermostat. The elements will continue to heat until they reach the set point of the thermostat. Try to lower the temp setting first. If that does not fix it, you'll need to repalce the thermostat, located very near the element, under the screwed cover on the side of the tank.------------- To know how this heater works, read as follows:---

Because electric tankless water heaters have to instantaneously raise the temperature of incoming water to a selected hot water temperature, they require very powerful heating elements. To power the heating elements of this 27,000 Watt model, you will need to upgrade the electrical service you were using for your storage tank water heater. The PowerStar AE125 will require a 240V, 200 Amp service. In addition you will need to install three 40 amp dedicated double pole breakers in your electrical box. In Canada, you will require one 120 Amp breaker.

The PowerStar AE125 electric tankless water heater incorporates a very sensitive flow sensor, and three heating elements. The heat from the electric elements is electronically modulated on the basis of the flow rate of the water entering the water heater, and the temperature rise that the water heater must achieve. Through its electronic modulation system, the AE125 maintains a very precise hot water temperature. As a safety precaution, each of the three heating modules is protected by an electro-mechanical thermal cut-out. This device will cut power to a particular module if the temperature gets too hot.

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This will help.Thanks.Helpmech.

Jul 02, 2011 | Heating & Cooling

1 Answer

Hello Geno, This is The Human Touch again. I want first of all the thank you for your recommendation of purchasing a hot water tank. We will do so when our tankless goes to Heaven! We live in sunny,...


This in NOT Geno--


But I wonder if you ever thought of using a small Electric Hot Water heater?
Then when you shut that off-- you know it is not using ANY ENERGY!

As for cleaning the calcium from your instantaneous heater-- have you ever considered circulating an acid, or some Iron-out thru it, to remove minerals?-- Jut a thought-- You need a pump, and a bucket, and protective gear, to keep the acid out of your eyes, and off your clothing and hands, etc.-- One of those little flexible rubber impellar pumps works great!--- just don't run it dry!

Just a thought-- Sorry to stick my nose in, if you wanted only Geno to answer--

If you want him to answer you directly-- just send a reply to his last not e to you-- and it will show up in his 'IN' box.
Keep Cool!
Mack B

Jan 27, 2011 | Heating & Cooling

1 Answer

Rinnai infinity standing in the shower and it suddenly goes cold for a few seconds no other water been run in the house or it goes cold and goes to a trickle then comes on again. Could the heat ex changer...


We are a bit confused by the device that you are using to heat the Hot water with- Is it an instantaneous HW heater?--
They are pressure sensitive-- Could it be, that your water pressure drops momentarily, (which causes the instantaneous heater to shut down its flame-- and you get a pulse of Cold water.)

If your hot water is a tank-- It is possible that something is cycling your hot water away-- like rinse pulses on the Washing machine)-- or your dishwasher?

Tell us more about the Rinnal Air Conditioners and what they have to do with Hot water and your SHower?

Tell us more-

Mack B

Jan 23, 2011 | Rinnai Heating & Cooling

1 Answer

All water lines are not hot


Do you mean refrigeration lines? In general the bigger line of the two should be cold and the smaller line should be warm to touch. Depends on what the ambient temperature is outside. If it is cold outside the little line or liquid line will be cold. And if both lines are Hot you either have a heat Pump or the Valves are out of the Compressor. Will need more information on your problem.

Dec 19, 2010 | Heating & Cooling

1 Answer

Water not hot enough, have to open more than one hot water faucet to get hot water


The Dip Tube "The dip what?" you might say. In every water heater, there is a plastic tube parked in the cold port that brings cold water to the bottom of the tank to be heated -- and preventing it from mixing with already-heated water in the top of the tank.
If that falls into the tank or splits or breaks, then cold mixes with hot and suddenly your water heater doesn't work nearly as well as before.
There's a ton of Americans out there who know all about this because of a debacle a few years ago. The company that makes most of the dip tubes in this country changed its formula for the plastic. The new plastic was prone to disintegrate in certain conditions. The operative time period was August 1993 to March 1996. Aside from gradually or suddenly having much less hot water, the telltale was finding bits of plastic clogging faucet aerators.
There was a scandal, class-action suit, and settlement. But the terms of that expired several years ago, so if you find you have the problem, all you can do is try to deal with it. Even after replacing the dip tube and flushing the tank, you might still find plastic bits for awhile. But at least the water will again be hot.
Debacles aside, you should also be aware that even good plastic will eventually become brittle with age and hot water. We've found dip tubes in old water heaters that were split and broken. It's entirely possible for a water heater to outlive its dip tube. Simply replacing this inexpensive part can restore your tank's function to new and save you the cost of a new heater. So think about that before you run out and buy a new one if you experience this problem.
You may also want to flush out any built sediment. Check this out.

http://www.waterheaterrescue.com/pages/WHRpages/English/OrderPages/XCart/Sediment-Control-Flush-Kit.html

Dec 04, 2010 | Heating & Cooling

1 Answer

I had a new 315 litre vulcan hot water system installed today and the power was turned on about 4:00pm and it is now 11:45pm .. how long will it take to heat up before i can have a shower ? the water still...


I would check breaker to make sure it is not tripped. Next check owners manual for location of reset and make sure it is set. If you have a volt meter check to see that you have proper power supply. You should have had hot water long before now. After you have checked above items and if you don't have any sucess I would call your installer. Hope this helps. Thanks

Nov 24, 2010 | Heating & Cooling

1 Answer

Radiator feels cold engine is over heating please explain how this is happening and the water comes up out of the bottle cap when it's closed


Sounds like the thermostat is stuck, not allowing hot water from the engine to flow to the radiator. Thus the engine is getting overheated and the radiator still feels cool.

May 07, 2010 | Heating & Cooling

2 Answers

Powermax boiler 155, when boiler reaches operating temperature the presure relief vale blow's off at 3 bar, when it cools down the presure go's down too, right down to zero needing a water top up before a...


Sounds likes you have a hot water system. Some where you have an expanion tank that is full of water and it should be half full. It will a round tank above the boiler and may even have a site glass on the end off it. It will have a special valve on it to lower the water level in the tank. The tank is to absorb the expanding water as it gets hot, and releases it when it cools down therefore preventing your relief valve from popping off.

Oct 14, 2008 | Heating & Cooling

2 Answers

Water tank is suddenly filling up


look closely how the water flows from the evaporator to the tank. does it goes first to the condenser ?..or is there a heating pipe that is touching the tank in order to heat the water for it to evaporate?

here's the set up, your ac would cool and absorb moisture in the air and becomes water in the evaporator. these water is sometimes used to cool the compressor or the condenser to help it run cooler and at the same time evaporates the un-needed water . but incase the water is so much then you have the tank to keep the water from spilling. sometimes they still put some hot pipes to further heat the water to evaporate.

check those pointers that i have mention.

in some case, the air in your place just got humid and wet that is why it has too many water condensation..

Aug 08, 2008 | Danby DPAC8099 Air Conditioner

1 Answer

Hi, I have hot water coming through the cold water taps in the house, there is a check valve on the cold water return side of the water heater. could this be the problem? The cold water line feeding the...


i have seen a faucet that has a valve on the end (like your pull up on the shower)back feed the hot water or yes you could have a bad ck valve dan

Jul 23, 2008 | Heating & Cooling

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