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Can not raise temp of water as we had 3 years ago. sorry to say never had maintenance and sure thats it

What would be the most effective maintenance to raise water temp

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Drain tank to get all of the sediment out. turn supply off, drain, leave drain open and turn supply on to stir up bottom. drain til clean turn drain off. fill up. check temp control for temp setting.

Posted on Mar 31, 2015

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Posted on Jan 02, 2017

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How do I flush this unit


1) Copy following link for steps showing how to run white vinegar through Rheem tanklessx heat exchanger to partially remove scale that coats heat exchanger and reduces unit efficiency and causes error code IL:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html#de-lime

2) Tankless are prone to scale inside heat exchanger and require yearly deliming to mitigate effects. Do the required yearly maintenance to avoid common error codes.

3) Expected cost of maintenance and repair is more expensive than estimated $1-8 monthly energy-bill savings from owning tankless.

Dec 31, 2012 | Rheem EcoSense by 7.4 GPM Tankless Water...

1 Answer

I have a Bosch 250sx NG I hired a plumber to install. I have 3/4 water and 3/4 gas line to unit. When turned to hot the water is cooking, turned down it is great,,, almost. My water will turn cold for...


Before calling service technician, open following link for Bosch troubleshooting steps.
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

If you are not getting error code, then problem could be somewhere in plumbing, as you suspect.
For example cross-over on single-handled faucet, or faulty check valve on re-circulation system, or sediment clog at elbow, or varied water-well pressure. Install in-line pressure tank.
http://waterheatertimer.org/pdf/Bosch_Overcoming_fluctuating_temps.pdf
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Be sure to read manual for yearly maintenance protocol.
Tankless must be maintained, and cannot be exposed to hardness in water greater than 11 grains, and should be de-limed each year. Expect maintenance, service, and potential repairs and parts for tankless to far exceed expected $1-8 monthly savings. All costs are energy.

All gas tankless brands can be repaired by homeowner for $330.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Apr 22, 2011 | Bosch Water Heaters

1 Answer

I have a Rheem EcoSense tankless water heater that I want to set the temp to 140degF. How do I set it internally for this?


1) The best place to find this information in your manual.
Typical Rheem manual in my files shows temperature is adjusted by pressing UP and DOWN temperature buttons on remote.

2) Manual says: Temperatures of up to 140°F
(60°C) for Light duty models and up to 180°F
(82°C) for Heavy Duty models can be
achieved with the MAIN (UMC-117) remote
control and a dip switch adjustment. Only
qualified service personnel should perform
this adjustment. Only factory authorized
remote control(s) should be used.

3) Typical manual shows information on page 22-23. Search pdf for 'temp'
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf

4) This information squares with what I heard before that trained service technician is needed to adjust water temperature.
I think Rheem does this since tankless will not achieve that rise in temperature if incoming water is cold.
BTUs put out by tankless burner has limit.
If incoming water is colder than certain temperature, then tankless cannot raise temperature quick enough as water passes through burner.

5) You might also need a tempering tank, to modify cold water in winter:
http://waterheatertimer.org/Tempering-tank.html

6) Suggest you also read the yearly maintenance required for tankless.
For example tankless are prone to lime build up and need to be de-limed each year with vinegar.
Lime build up will certainly affect water temperature.

7) Following 2 links might be helpful for tankless owner:
http://waterheatertimer.org/pdf/Delime-tankless-water-heater.pdf
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 04, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Tankless water heater water will not come out hot enough


1) Read your manual

2) De-lime unit on yearly basis:
Search google and Utube for 'de-lime tankless'
They make special fittings that permanently attach to water ports so you can delime each year.
Research shows that reqular de-liming will not restore tankless efficiency.
http://waterheatertimer.org/pdf/Delime-tankless-water-heater.pdf

3) Typical manual shows temp information on page 22-23. Search pdf for 'temp'
http://waterheatertimer.org/pdf/Rheem-RTG74IndoorOutdoor_owners.pdf


4) Read maintenance steps shown in manual
The word maintenance appears throughout the manual

5) Search fixya questions on tankless to glean information about your unit:
Older answers have more responses, and each seems varied as techniques succeed for one person but not another.
The quantity of unanswered questions and vague answers reveals why Rheem suggests qualified technician be added to your rolodex-wallet
http://www.fixya.com/tags/rtg_74pvn

6) Other useful links for tankless owners:
http://waterheatertimer.org/pdf/Paloma-Tankless-Error-Codes.pdf
http://waterheatertimer.org/How-to-install-gas-water-heater.html


Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Mar 04, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

I have a Rheem (Paloma) GT199XN tankless water heater. It has worked fantastic since I installed about 5 years ago. Just recently, I have have intermitten issues of the burner not firing up when we turn on...


All costs are energy.
Here's the order of things I would do.

1) Contact Rheem for name of qualified service technician.

2) Call technician who can fix your specific unit, and can educate you about maintenance, and tricks and tips. These guys learn something new each day and are good to have in your rolodex/wallet as tankless unit ages.

3) Download manual, or read manual cover to cover and review maintenance protocol to make sure you're on a schedule for de-liming and other things required for tankless to work.

4) Ask Rheem how you can become familiar with their website pages that show updates and other information that affect your specific unit.

5) Install ordinary tank-type back up that can be put online quickly in case tankless needs parts or frequent maintenance as it ages.
http://www.fixya.com/tags/rtg_74pvn

http://waterheatertimer.org/How-to-install-gas-water-heater.html

Feb 27, 2011 | Rheem GT-199XN Outdoor Natural Gas Heavy...

1 Answer

Our 40 gal Rheem gas hot water tank is almost 3 years old. We have a well for water supply and a 2 year old Paterson Iron Remover plus newer water softener. Suddenly 3 weeks ago the hot water developed the...


I would have to go along with your brother on this one. The aluminum anode rod is by far the cheapest way to go. Other options include extensive filtration,ozone treatment and acid treatment.
The aluminum anode rod is much cheaper and I would recommend you change it yearly at least. Good luck and thank you.

Feb 22, 2011 | Rheem Water Heater Anode Rod AP12938

1 Answer

How do you increase water temp on Rheem 82v52-2 Water Heater?


Sorry to read about your problem, I hope this helps you out.

the big knob, at the base of the water heater, turn to warm or Hot. if water is not hot after that, you have other issues, it will take a hour or two, for the new settings to take effect.

I tried to help you. Please help me and Rate/Vote on my response. We take the time to answer your question's. take the time to rate us.Thanks and good luck

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Jan 02, 2011 | Rheem 40 Gallon FVR NATGAS Low WATER...

2 Answers

Runs out of hot water


I wonder if you have this problem below caused by a drop in water pressure from someone flushing a toilet or a washing machine. I would call the company to remedy this issue.

17. What is a cold water sandwich effect? The term “cold water sandwich effect” is a term that is used to describe the introduction of cold water into the hot water supply line during frequent on/off operation of an instantaneous water heater. The cold water sandwich effect, when present, appears as a momentary drop in hot water temperature as it is discharged from a hot water supply outlet (i.e. shower, tub, or faucet). This phenomenon is present in the operation of all instantaneous, tankless style, water heaters, but is minimized with the high tech design of Rinnai water heaters.
The technology built into the Rinnai water heaters is designed to minimize the cold water sandwich effect. Rinnai water heaters are microprocessor controlled and when water flow through them ceases, they remain in a “ready to fire state” for approximately 1 minute. If water flow through a Rinnai water heater begins within the first minute following water flow stoppage, the water heater will fire back up within 1 to 2 seconds. This minimizes the cold water sandwich effect that would otherwise be experienced with a low tech tankless water heater. It should be noted that the cold water sandwich effect cannot be removed completely from tankless style water heaters. The safety standards developed to insure the safe operation of water heaters require a delay in the ignition sequence of all gas water heaters.
While the cold water sandwich effect cannot be completely eliminated from standard plumbing systems, it can be eliminated from plumbing systems that have a supply and return hot water circulating system. Rinnai has developed 2 methods to eliminate the cold water sandwich effect in residential hot water circulating systems.
The first (and preferred) method to remove the cold water sandwich from circulating systems utilizes a small electric tank water heater (powered up) that is used with a dual purpose. The small water heater acts as a mixing tank to eliminate the cold water sandwich effect from the Rinnai water heater and it uses its electric heating element to offset the heat losses from the hot water circulating system.
The second method to remove the cold water sandwich from circulating systems utilizes a small 2 to 6 gallon storage tank installed on the hot water outlet of the Rinnai water heater. This tank acts as a mixing tank to blend the cold water sandwich with hot water and eliminating its effect at fixtures.

Mar 11, 2009 | Rinnai Water Heaters

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