Question about Rheem 40 GAL ELEC TALL Water Heater 6YR SC 82VH402

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My mains pressure Rheems hot water system only reaches 44 degrees

Cylinder about 10 years old; replaced element 5 days ago, still no improvement. What next? Thermostat or mixer valve?

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Thermostat would be my next to replace.

Posted on May 13, 2010

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I have a Rheem Stella 850 series 360 L which is one year old. I have noticed the last few days that the hot water pressure is dropping and water flow is fluctuating in and out.


Did you do back flow? Suggest you perform back wash via the hot water outlet of your heater by plugging a hose. What is the tubing size that flows thru the heating elements? If it's small, maybe you need to apply higher back pressure to remove the soil. Does it have a built in pump? If it has, check the ******* strainer, maybe it's cloaked up with debris, you never know what's in the line.

Jun 21, 2016 | Rheem Water Heaters

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Is my A.O.Smith 52 913 really something else?


first off , it is probably a genuine hot water system
secondly --- the heating elements are not made by the manufacturer but are off the shelf items that are made by electrical manufacturers as this reduces the cost of the unit and allows spares to be bought any where from reputable dealers or plumber shops.
that would explain why there are different elements as they may have failed at some point and have been replaced by a plumber
next , it doesn't matter which element is positioned where as they head water and the location , being in close proximity would not make a great deal of difference
normally there would only be one element in operation as the extra element is for fast hot water recovery ( long hot showers , many people showering or fast heating after all the hot water has been drained for an element replacement)
the element with all the controls would be the main element and it will control water temperature and also it should have an adjustable screw or knob , that can be turned to adjust the thermostat setting
there should be wires to the second element from the controller of the main element so that it is cut in when the water falls below a set temperature
If you have 25 years and the system is not leaking anywhere then the cheapest outcome is to have an accredited electrician/ plumber check out the elements
The secret to hot water systems is to have the thermostat setting low ( around 65 degrees c is hot enough for the hands and body) and the temperature difference between utility supply temperature and the set temperature means that you can draw off more water before the hot water system switches on the power
conversely if you have it set so that is at 100 degrees C the the cold utility supply only has to drop the water 10 degrees and the power switches on to maintain the 100 degrees C
any way get an accredited electrician / plumber in to check it out and get a quote

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1 Answer

Buying a new electric hot water heater and seeing two different types of elements; copper and combination. Is one type better than another, and if so, which one?


hot water systems come in three types
copper--subject to electrolyses around the heater element area where they leak life expectancy in good water areas -- possible 20 years
steel ( vitreous enamel coated to prevent rust-- subject to cracking of the covering during manufacture and transport and rusting around the ports-- life expectancy if in perfect condition - around 10 years
stainless steel-- mainly the cost but if in hard water areas is the most cost effective - life expectancy well past 20 years in harsh water conditions
the heater element are mostly copper as in the stove element and will last a long time provided the heater tank has water covering the element although the element may be stainless
however regardless of the material used it is the porcelain inside the covering that allows the element to short out and burn the cover
most hot water systems use common heater elements so it may be wise to keep operational units for future use
Best is to talk with a good plumber supply shop ( not a hard ware shop) and get all the details before buying a new system
repairing is not really an option

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1 Answer

Pressure relief valve intermittent noise


check your water pressure and then make sure it is not to high or all the problems you have had were not the answer. it is a pressure /temperature valve not just . temp.

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Relief valve buzzing noise


Add an extrol expansion tank to the piping. You can get one for about thirty dollars from the hardware store.

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1 Answer

How long does the model 81v52d last in years?


Did you clean sediment out of tank when replacing elements?
Did you replace thermostats? Thermostats go bad, or get out of calibration.
Copy following link for tank-type electric water heater troubleshoot:
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html

Test elements.
Sounds like lower element is burned out.
Clean sediment out of tank. Check for water leak running hot water out of tank by putting ear against pipe.
Replace both thermostats.

Electric water heater will last 20+ years, IF ...
Electric water heater is totally unique because it can last forever with part replacement using parts from hardware store, as long as tank does not rust because of depleted anode rod, and pressure is kept below 80psi.
http://waterheatertimer.org/How-to-maintain-water-heater.html
Annual water heater maintenance will pay you $10 a month, tax free money in pocket, by avoiding tank replacement.

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1 Answer

Have Model EX380T2T2 Serial # 777604. Have purchased two EX630 heating elements and installed them. Water got hot for about a week. One more old heating element burned out. Fixed it by reattaching to...


A lot of problems can contribute to this problem.
As you know, tankless cannot be exposed to water with more than 11 grains of hardness.
Tankless require softener and filter system which can affect line pressure and flow, which will adversely affect tankless unit.

The problem could be clogged sensor, bad board, but still that doesn't explain burned out elements unless the elements were coated with sediment.
Sediment build up will kill a tankless within 2 years and render it useless and unfixable.
Yearly deliming will not restore functionality.
If pressure is a contributing factor, you can add a pressure tank that will even out the pressure.
All in all it looks like the pressure sensors and other sensors are crashing.
Call service technician, and glean from that person the tips and tricks.

Read the manual for advisories and required yearly maintenance.

You can fix this tankless problem yourself, same day, by installing $207 tank-type electric water heater from box store. Offer 10% less and also buy flexible connectors to connect to existing water lines. The cost of running and maintaining electric tank-type is cheaper long term. All costs are energy.
http://waterheatertimer.org/9-ways-to-save-with-water-heater.html

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1 Answer

2 green flashes. hot water is blazing hot set at 120 degrees.have the energy smart unit model#ee2h50rd045v . what is wrong?


2 green flashes is 'High Water Temp.'
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html

Typical energy smart manual:
http://waterheatertimer.org/pdf/Whirlpool-energy-smart-electric-manual.pdf

3 flashes is Temperature Sensor failure.
4 flashes is Upper element
5 flashes is Lower element

Troubleshoot section says:
1) Make sure access doors and insulation are installed.
2) Check elements for resistance of 5-25 ohms (if element has a short in center of element, it might not trip breaker)
http://waterheatertimer.org/How-to-test-water-heater-element.html
3) replace element and reset control system.
Buy ordinary 4500 Watt element from hardware store.
http://waterheatertimer.org/How-to-replace-water-heater-element.html

4) I also suspect the self-diagnostic control box.
Manual says: Repair parts may be ordered through your plumber,
local distributor, home improvement center, or by calling
1-877-817-6750.
You need serial number, product number and model number from label on side of tank.

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I have a 135 litre, 10 year old Rheen mains pressu...


usually on the hot water piping, It starts to rust closed faster than the cold side, due to electrolosis. What you r discribing are the first signs of this happening. only solution is to replace the effected pipes..

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Rheem Hot Water Cylider Thermostat keeps tripping


Sounds like you have a faulty thermostat.  This is the unit that detects the water temperature, and if it is not where it is set, will kick the switch to allow electricity to flow to the elements you replaced. The thermostats are relatively cheap and if you have the knowledge to change the elements, changing these thermostats should not be a problem.

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