Question about Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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Product is four years old - Rheem Tankless Hot Water Heater Rtg-74pvp-2 7.4 Gpm

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  • Rheem Master
  • 5,245 Answers

Delime tankless each year.
Copy following link:

Tankless cannot be exposed to more than 11 grains hardness in water.

Posted on Nov 09, 2012


6 Suggested Answers

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Good luck!

Posted on Jan 02, 2017

  • 68 Answers

SOURCE: rheem gas tankless water heater with error code c4 13

problem is inside burner compartment o2 sensor dirty or block..need to have a qualify technician clean it.

Posted on Jul 31, 2010

  • 68 Answers

SOURCE: Rheem tankless rtg 74pvn - heater hot water shuts

This is something you will have to contact rheem about due to the fact you don't have a fault code

Posted on Aug 12, 2010

  • 68 Answers

SOURCE: rheem tankless vibration when water is first turned on

This is cause by air in the gas line if the problem don't go away in a couple of days contact rheem there could be a gas control problem

Posted on Aug 12, 2010

  • 130 Answers


Probably the thermocouple, this is a very cheap and inexpensive part to replace. You can pick one up at home depot for about $20. For in depth instructions on how to remove and replace, please reply.

Posted on Dec 02, 2010

  • 130 Answers

SOURCE: Water leakage at lower heater

I believe your water heater could have a 6 yr warranty. If its leaking then you should be able to get it replaced for free. Call the place you pruchased it at and see what their procedure is for returning it. Most places just allow you to bring it back and they will give you a new one. To uninstall, first shut OFF the breakers to the power or shut off the gas. Then shut OFF the valve to the water supply line and if there is a shutoff valve on the other water line line coming out of the heater, shut it off also. Once the water valves are shut off, remove the two water lines from the top of the unit. On the bottom of the unit you will notice a water faucet valve. Attach a garden hose to the valve and run the hose outside on the ground. Open the water valve and your heater will drain through the hose to outside on the ground. Then, with the power OFF, unattach the wires from the junction box or wherever they are attached or if it is a plug, then unplug it. If it is a gas model, unattached the gas line AFTER the gas is truned OFF. Once the water has fully drained from the tank then it should be ready to be moved. Reinstall the new tank in the same manner in reverse.

Posted on Mar 29, 2011

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My Jacuzzi J-N180F tankless water heater will not even light.

Access your product manual.
I cannot find a product manual.
Some major company, like Rheem, makes this computer that heats water.

Call service technician to repair the unit.
Copy following link for overview of type of problems found with tankless computers.
For example tankless computers require continual maintenance on yearly and monthly basis to prolong expected life of product.

If tankless computer is older than 5 years, then assume it is like your 5-year old laptop computer.

Save problems, and repair the unit yourself, same day, by installing tank-type water heater:


Aug 27, 2013 | Jacuzzi 7.5 GPM 180000 BTU Internal Gas...

1 Answer

Moved into a house with an existing Rinnai system. We have controllers in the kitchen and bathrooms. My understanding was that you can change the temp by hitting the priority button then up or down as long...

You need a product manual for your tankless computer that heats water.
Look on side of unit for label.
Then google that brand and model and add .pdf to search parameter to find possible resources.
Or try Rinnai website for a dose of promotion about how great their product is.
If unit is a few years old (age of unit accessed with serial number), there might be no manuals posted online since manufacturers often drop manuals from website after a few years, assuming most their products no longer function correctly and thus avoid available knowledge for customer to talk specifics... instead telling customer to call service tech who of course does not have manual either because he is a tech and needs one, but got hired last week to his new esteemed position and gets paid by service call not by successful repair except bonuses for recommending replacement unit.

Read the manual. Especially required maintenance, such as deliming yearly and cleaning water filter.
Note resources for maintaining tankless appear on following link except for different brand tankless computer:

Also scroll down page to read explanation of high temperature limit for tankless before causing irreversible problem with your computer requiring skilled technician.
Also scroll up on page to read about no error code, since cooler than normal temperatures from tankless computer can be result of common plumbing problems like defective single-handle faucet cartridge. Or power surge, since tankless are not protected from ordinary surge event like power restored after outage.

If your tankless computer is older than 5 years, then assume it will not work better than your 5-year old cell phone or 5-year old laptop, or behave better than 5 year old child. So don't assume you are doing something wrong... just assume it doesn't work despite glossy advertising brochures from tankless manufacturers claiming 20 year lifespan for tankless computers.

Install tank type heater yourself, same day and avoid computer water heaters: Ordinary plumber can fix these units easy.


Aug 22, 2013 | Rinnai Water Heaters

1 Answer

Gas outdoor mounted AQ250 won't stay lit. Unit is about 2 years old and has been working great.

Before calling service technician, open following link for Bosch troubleshooting resources.

Sample manual has troubleshoot section and yearly maintenance requirement.

Service bulletins for 250SXO

Tankless require yearly maintenance as outlined in manual.
No tankless manufacturer suggests do-it-yourself repairs on their product, in part for liability and danger to customers, but for long-term customer satisfaction.
Repairs and yearly maintenance will eliminate the $1-8 monthly energy savings expected from owning tankless.

Apr 19, 2011 | Bosch AquaStar 2400ES-NG

1 Answer

Hi I have a bosch instananeous hot water heater 16H, it is about four years old. Since quite early in its life the hot water flow has become less and less. now when i turn the hot on full it takes...

1) You might have a simple liming problem, requiring deliming by qualified service technician.
If you want to do-it-yourself, Utube search: de-lime tankless water heater

2) Usually the warranty requires yearly, and periodic maintenance like a new car:
Maintenance protocol requires yearly de-liming.
Tankless cannot be exposed to water exceeding 11 grains hardness, and require softener and filter.

3) Look up your manual on following link and read entire thing to shake off promotion-driven-perception that tankless solve all water heater worries:

4) The promise of 'longer-life than tank heater' is not supported by actual product warranty.
Check your manual for warranty.

5) Since all costs are energy, tankless can fall short of energy-saving claims.

Feb 24, 2011 | Bosch Water Heaters

1 Answer


Probably the thermocouple, this is a very cheap and inexpensive part to replace. You can pick one up at home depot for about $20. For in depth instructions on how to remove and replace, please reply.

Dec 02, 2010 | Rheem 50 Gallon FVR NATGAS Water Heater...

1 Answer

Furnace filter gets black within 1 day. Electric furnace is 5 years old

I would take apart the burner and have it cleaned out thouroghly for its full of carbon

Jan 14, 2010 | RTO Home Heating Products 5.5HH240...

1 Answer

Takes long time to heat then goes from hot to cold.

I know that this is a great answer but with out being there its hard to answer you call there tech support they are great, I have had to call they from jobs before they can help
Phone Support:
Gas Products Technical Support: 800-642-3111
Electric Product Technical Support: 866-330-2729

Feb 03, 2009 | Bosch 1600H-NG Natural Gas AquaStar...

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