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Plumbing connections Looking for the correct methods to connect the plumbing for a tankless water heater.  I'm finding that some suggest the addition of either a 2 to 6 gallon storage tank, or a small electric water heater, plus a circulating pump.   Are these additions necessary.  ?   Thanks! jorge

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Water source. City...New line..."T" the line so cold water services the house and the other line runs direct to the inlet side of the heater. Make sure you are connecting to the line after it passes through a pressure regulator. If you have a pump and water tank...."T" the line after the tank so cold water services the house and run a line directly to the inlet side of the heater. The outlet side gets connected to the main feed for hot water to the house. These do not require a storage tank. It does take a short period of time to heat the water, but once they get to temp they have an endless supply. Make sure you vent the heater if gas. After you get hot water, you can adjust the temp to the required temp according to the code in your area.

Posted on Apr 24, 2009

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Posted on Jan 02, 2017

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My Rheem tankless water heater has been flashing a C8 and 76 code. I can turn off the heater using the power button on the unit, but my hot water will only last for a shower or so. Any suggestions? ...


Before calling service technician, open following link for troubleshoot resources including Rheem chat and contact, possible manual, error codes, etc.:
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

C8 76 is generally bad PC board. Call 800-432-8373
Just like a motherboard on your computer, the tankless PC board is operational center of tankless water heater.
Various sensors gather information from water pipes, gas line, vent pipe, and air supply to determine when to activate burner.
Most people understand that when their computer motherboard needs replacement, that computer will probably not work reliably again.

Tankless is basically connecting a complex computer to your plumbing and electrical lines and to a gas burner with a vent pipe to outdoors, despite knowing that plumbing lines, vent pipes, gas burners, and household electrical systems have plenty of problems on their own.

Age factor: When tankless is new and everything operates perfectly, the tankless works correctly.
And each tankless manual recommends yearly and monthly maintenance, just to maintain operation, the cost of which can exceed the expected 1-8$ monthly savings. And who wants to clean the water filter each month and delime the exchanger every year?
http://waterheatertimer.org/pdf/Tankless-maintenance.pdf

Don't buy a tankless water heater because the only folks promising unlimited hot water and effortless water heating experience while saving money with a tankless are the tankless promotors.

Solve most tankless problems yourself, same day, any brand for about $350.
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Sep 22, 2011 | Rheem Tankless Water Heater Main Remote...

1 Answer

Our tankless water heat will not heat the water-it won't ignite


Question posted under Boasch tankless. Model number not known.
Before calling service technician, open following link for Bosch troubleshooting resources, including phone and contact for Bosch, error codes, and possible manual, plus hours of reading and research:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

As you know from reading manual, tankless water heaters require yearly maintenance by trained service technician, or by homeowner. This action would check gas and pressure, venting draft, condensation drain, burner and combustion parts, igniter and-or pilot light, electrical connections, air intake and general condition of plumbing.
Problem you describe does not include error code.
Open following link for possible help with general plumbing problem:
http://waterheatertimer.org/pdf/No-Error-Code.pdf

Add a comment with model number that appears on side of unit, and I can directly locate possible service bulletins and further troubleshoot resources available at Bosch for possible do-it-yourself diagnosis and repair.

Sep 02, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

I installed a dhc tankless heater, but when I open only the hot water everything is ok, but when I open the cold water at the same time the heater turns off.


Hi and welcome to FixYa, I am Kelly.

What is happening is that your cold water flow is greater in volume (gals per min) than your hot water. So when you open the cold water it is mixing with the hot water inside the faucett or shower plumbing and actually reverse flowing back into the hot water heater plumbing. The reverse flow slows the water flow sensing turbine inside the heater and it is thinking that there is not any water flow. (There isn't actually due to the equalization of water pressure when you open the cold water faucett) Since this is a safety feature of the tankless heater to keep it from overheating, it shuts off.
Somewhere in the hot water plumbing there is a major restriction. It may very well be the internal plumbing of the tankless hot water heater or the flow detector design.

There are 2 ways to correct this. The easy way would be to restrict the available cold water flow. You can do this by installing another shut off valve inline with the cold water plumbing and just not open the valve all the way. You would have to adjust the setting so that the hot and cold water can be on at the same time and the hot water heater stays on. The hard way is to locate the hot water flow restriction and eliminate it.
It is possible.... if you have a flow restrictor in a shower head or a screen in a faucett areator that they are partially clogged. Clean any flow restrictors and screens then see how the hot water heater performs before you start modifying plumbing.

Thanks for choosing FixYa,
Kelly

Apr 10, 2011 | Stiebel Eltron DHC-E 8 Tankless Electric...

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I was told that i am being sent a replacement heater for my ae125. after looking at the unit i do not see how i am to remove the old heater. any help would be of great help.


It seems unprofessional that Bosch, or any tankless manufacturer, would suggest self-installment when each tankless manufacturer pointedly says their product should be install and maintained by person specifically trained by manufacturer. Especially when it is widely known that self-installed units can void the warranty.

That being said.
Cover on your unit should come off. Unit is attached to wall with screws/toggles at each corner.
Gas line (assuming gas heater) should have a union located on gas line near tankless unit.
Hot and cold pipes are located on bottom of unit.
Vent stack is attached to top.

Specific plumbing techniques are used for each item shown above.
If you are not fully qualified to work with gas appliances, or have no plumbing experience, I suggest taking advantage of fixya paid service where expert walks you through each step while you work on unit.
But you need the tools and vocabulary, and remember the expert cannot see what you are doing or know exactly what you are talking about.

Frankly, if you are not qualified, call a service technician.

Install DIY tank-type gas water heater and avoid the whole headache
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Mar 08, 2011 | Bosch PowerStar AE125 AE125 Whole House...

1 Answer

Can we install a a ptg 74pvp tankless hot water heater in a closet? Would we need to install grating in the closet wall to provide more fresh air?


Rheem Tankless Water Heater Selection and Installation Videos
  • Introduction - time 04:11
  • Pre-Qualifying the installation - time 01:13
  • Selecting the Right Product - time 01:48
  • Key Differences Between Tankless & Storage Heater- time 01:27
  • Choosing the Location - time 01:20
  • Installation: Major Components - time 00:58
  • Installation: Tools Required - time 00:48
  • Installation: Mounting the Heater - time 01:15
  • Installation: Plumbing & Gas Connections - time 04:29
  • Installation: Side Wall Vent Termination - time 02:41
  • Outdoor Installation - time 01:21
  • Connecting the Remote Control - time 01:42
  • Turning on the Water Heater - time 01:00
  • Commercial vs. Residential Products - time 01:47
  • Manifolding Multiple Units - time 01:43
  • Troubleshooting & Additional Support - time 01:01

Feb 02, 2011 | Rheem Tankless Hot Water Heater...

1 Answer

Bosch tankless heater flucuates hot cold?


It sounds like you have a plumbing cross over or a poor install. Check boschhotwater.com to find a service technician and have a Bosch service provider look at it.

Mar 06, 2010 | Bosch & Tankless LP Hot Water Heater

1 Answer

No hot water from bosch tankless heater


  1. If the display is blank, verify power to electrical outlet. (120VAC/60Hz properly grounded circuit required). Verify that the heater on/off switch is in the on (I) position.
  2. Verify the fuses in the control unit are good.To access fuses, the control unit must be removed. See BULLETIN TWH-G2-24 Two spare fuses are located inside lower access panel of control unit.
  3. Make sure cold water inlet connection is plumbed to the right side of heater when facing unit.
  4. A minimum of 0.8 gallons per minute (GPM) (3 l/m) is required to activate the heater. A quart container should fill in 20 seconds or less to activate heater.
  5. Clean inlet filter screen per chapter 5.2. of the installation manual.
  6. Inspect the water path for obstructions. Make sure all showerheads, faucet aerators and whole house filters are clear of debris.
  7. The heater activates when the water flow through the unit is at or above the required minimum of 0.8 GPM (3 l/m). A crossover creates back pressure on the water flowing through the heater. Therefore, a higher flow rate than normal is needed to force the heater to activate. To check for a plumbing crossover, shut off the cold water supply feed to the water heater. Then open all of the hot water taps served by the heater. Wait 10 minutes and check for water flow at taps. There should be no water flowing. Any continuous flow of water indicates a crossover is present and must be corrected. Consult a professional plumber for help in correcting a crossover. Failing single lever faucets and mixing valves are common causes of plumbing crossovers.
  8. With the ON/OFF switch turned to OFF (O) position and the power supply cord unplugged, remove theunit's front cover (See Page 5. Fig 3 of installation manual). Check wire connections between the water valve, control unit and electrode set. See chapter 9.2 of installation manual for location of these parts.

Feb 14, 2010 | Bosch & Tankless LP Hot Water Heater

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