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On demand, tank less water heater

I have a tankless gas fired water heater in the bathroom. It is 9 years old. After the tank was cleaned with an acid wash, the hot water stopped delivering to the sink faucet. The tub and shower have sufficent pressure to ignite the burner (the burner works fine) but there is still no hot water delivered to the tub faucet. I have disconneted at various joints to confirm that water pressure flow is adequate and at the heater it appears so. In fact when you first turn the water on the water delivered from the tank is warm to hot for all of 1 sec. then to tepid to cold, again only at the tub. If I turn the tabs on at the tub and the sink there is no increase in flow. Any ideas on how to repair or what might be worng?

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  • Anonymous Mar 26, 2014

    can go hours before tank fills up with hot water i have a warmsure condenser boiler nthe problem is recent had water turned off for a new sink fitting ,now the whole houes suffers

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THE WATER IS RECIRCULATING IN THE UNIT. MAYBE CAUSED BY THE ACID. TRY INSTALLING A BACK FLOW PREVENTER

Posted on Oct 27, 2008

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If you are installing new tankless in place of 40 gallon gas water heater, then you CANNOT use same vent pipe.
You must use larger diameter pipe that is specified by instruction sheet, and the pipe must be approved plastic or stainless steel to avoid corrosion.
The vent pipe must also have a condensate trap to catch acidic water that drips back down the vent pipe.
The reason is that tankless burn more gas than regular tank-type heater... because tankless must raise temperature quickly as water passes in a pipe.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

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My water heater shuts down in cold weather. How do I fix this problem


Add tempering tank.
Tempering tank made from old tank-type water heater, or small tank heater will passively heat incoming water.
http://waterheatertimer.org/Tempering-tank.html

This works because tankless can only raise temperature so many degrees. If water is very cold, tankless cannot keep up, so the sensors shut down the unit.
Passively preheating water... or using a small tank connected to power can preheat water enough so tankless works.
Also delime tankless each year will help remove natural scale that builds up inside tankless heat exchanger.
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If tankless computer is less than 5 years old, then call Rheem for local technician qualified to work on this type of computer that heats water.

If tankless is older than 5 years, then replace with tank-type electric water heater for $285 from Lowes.

Avoid Rheem, Richmond, Palmoa, GE water heating products since this company does not post service manuals.

Choose AO Smith, American, State, craftmaster, Whirlpool etc.

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Oct 01, 2013 | Rheem RTE-9 Electric Tankless Water Heater...

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Unit has been in service for several years. I had to replace the motherboard last spring. I have no power to the unit. The inline fuses are intact. the outlet is hot. Breaker is sound. all wiring is...


I can offer resources:
1) Open following links for possible help.
http://waterheatertimer.org/pdf/No-Error-Code.pdf
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/Low-hot-water-pressure.html
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

2) As a note: When the motherboard on a computer or phone needs replacement, most people figure the device is about used up. The same is true for tankless.
Despite promotions claiming longer life, tankless warranty is not longer than warranty for typical tank-type water heater.

3) Fix most tankless problems yourself, same day, for $300-400
http://waterheatertimer.org/How-to-install-gas-water-heater.html

Take a moment and rate answer for accuracy:
And 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.

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Hot water heater restarts then turns off. This happens over and over again. It clicks off about 3 seconds after the burner actually fires up. Water Heater: Kenmore Power Miser 9 w/ White Rodgers Intelli...


Service technician is probably best bet for troubleshooting all possible causes from plumbing leak to burner assembly needing cleaned to blower problem to bad gas control valve or tripped ECO, or combination of things listed above.

The intelli vent controller has error codes.
Open link for images, error codes and sample manual.
http://waterheatertimer.org/How-to-adjust-water-heater-temperature.html#Intellivent

I think the Kenmore is a Rheem product, but the market changes very fast.
Intellivent control indicates that water heater has a blower on top of heater that communicates with the gas control valve to coordinate combustion.
Rheem recommends the burner assembly be cleaned no less than once a year by trained service technician who has the tools and experience.

Newer gas water heaters, both tank and tankless are maintenance heavy because of energy and safety standards, and because of new electronic controls. Tankless require more frequent attention.

If problem is going to cost more than $330, then install new gas water heater yourself from local box store. I recommend avoiding electronics, and blowers, and tankless so you can hold down costs and maintain the unit yourself.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Water heater electronics and energy factor are good initial selling points, but all costs are energy, and repairs, service and parts of more sophisticated machines can cost more than the $1 to $8 saving you can expect under best circumstance.

Upvote the help.
And 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.

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

Sometimes people attach tankless to tank-type heater to preheat incoming cold water.
Additional tanks are also used to store solar heat, and some installations have tank-type because tankless is unreliable. Service technician can sort out the function correctly.
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Since tankless are expensive to repair and replace, you might be able to fire up the tank-type water heater and provide hot water without much cost.
You can also install tank-type gas water heater yourself. Lowes sells 40 gallon for $317.00, and then you offer 10% less.
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1) Flush tank each 6 months to prevent sediment.
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2) Inspect and replace anode rod.
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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.

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