Question about Rheem Paloma PTG-74PVN / RTG-74PVN Natural Gas Indoor

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Problems with tankless water heater- shower furthest from tank does not stay hot for length of shower-it goes cold for about a minute 3-4 times during a longer shower.

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  • Corrie Stokes Jun 06, 2013

    Did you ever get a response or solution to this? I have a similar problem.

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How long has the heater been installed?

Posted on Sep 06, 2009

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I have a recently installed richmond water heater. When the shower is running and someone turns the faucet on in the kitchen the water gets drastically colder in the shower. We didnt have that problem with...


Which type Richmond water heater?
Is this a tankless water heater or tank-type?

Tankless are notorious for 'cold water sandwich' under exact conditions you describe. You might need tankless with larger BTU burner.
Don't install a tankless.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

If you have tank-type water heater, then I suspect a clog in the hot water line, or single-handle faucet cartridge in show is going bad.
Same problems can contribute to tankless problems.
http://waterheatertimer.org/Low-hot-water-pressure.html

Aug 06, 2012 | Rheem Richmond

1 Answer

Hi there, I have a bosch aquastar 125b waterless tank. My problem is that i am not getting hot water at all. The water runs during the shower and it stays warm. HELP!!


This should run two showers at once with no problem. If you have a shut off valve on the cold side of the heater, try closing about halfway. This will slow the water flow and the water will have more time to heat up as it pases through the tank. If you dont have a shut off valve, just cut back the hot water valve on your shower and do not use any cold water. If it gets too hot then turn on a little cold water. The object is to slow the speed of the water going through the tank. Tankless heater take a little getting use to but they work great when you know how to treat them. On my shower I turn the hot all the way on until it gets hot and then add a little cold water to bring the temp down. You may have too much water going through too fast to be able to heat it up to what you need. Try this and see how it works.

Mar 26, 2011 | Bosch AquaStar 2400ES-NG

2 Answers

I have a Paloma Whole Home 7.4 GPM Water Heater, it is a propane heater. I bought this heater in 07 and I get the same problem ever year. When the weather gets cold and the water is cold the hot water...


If incoming water is too cold, tankless might not have enough time to heat the water as it flows by insince the heat exchanger.

1) You can passively preheat cold water using staging tank, or tampering tank.
http://waterheatertimer.org/Tempering-tank.html

2) Buy old water heater from plumber that is not rusted out.
Replace anode rod to stop further rust.
Rinse tank with water and hydrogen peroxide to kill bacteria that results from anode rod.
http://waterheatertimer.org/Replace-anode-rod.html
Clean sediment out of bottom:
http://waterheatertimer.org/Clean-sediment-out-of-water-heater.html

3) Don't forget, a tankless heater needs to be de-limed each year, and cannot be exposed to more than 11 grains hard water.

4) Since all costs are energy, when you get tired of messing with tankless.
http://waterheatertimer.org/How-to-install-gas-water-heater.html
http://waterheatertimer.org/images/Compare-water-heater-parts.jpg

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.

Jan 18, 2011 | Rheem Paloma PTG-74PVN / RTG-74PVN...

1 Answer

Our tankless water heater is about 3 yrs old and when you take a shower the water is so hot it will burn you and when you try to cut more cold on it turns all the way cold we have it turned down as low as...


almost all tankless water heaters have this problem. I would install a small "buffer" tank. for example a small 5 or 10 gallon electric water heater will "mix" the water so that it doesn't come out of your shower cold, or scalding hot.
the instructions that came with your water heater should have a diagram of how to do this. if not let me know, I can send a copy.
the electric water heater acts as a mixing station.
the problem with most tankless heaters is that the water coming in is cold, average 60* and the water coming out is average 120*. sometimes the flame in the unit can't keep up when using large amounts of water, and you will get cold spots. when this happens, the heater will sense this, and then tells the flame it needs more BTU's, so then you will get extremely hot water.
the buffer tank will fix this by mixing the water before it gets to your shower and will give you an even water temperature.

let me know if this helps

Aug 22, 2010 | Bosch Water Heaters

3 Answers

Water turns cold very quickly


I had the EXACT same problem (installed my tankless last winter and worked fine, now this summer it fluctuates, have to turn the shower completely off and then on again to get any hot water and then it only lasts for a couple of minutes!) Argh - it is frustrating!

Here's what I found: the demand for hot water is lower during the summer (hot) months because the "cold" water coming in is already quite warm. You don't need as much hot water to make the shower temp comfortable. SO, my tankless was shutting off due to low flow demand. I've removed the flow restrictor from my shower head and it helped alot but didn't completely solve the prob. Next step is what has been recommended to me by several people but is much more expensive - change the pressure valve on your shower to a temperature valve. Or just wait til winter and it should work ok again :)

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

1 Answer

Heats up the rapidly decreases within in minutes.


Problem new or old? How long you have unit? Sounds like not enough flow to keep burner on. Tankless need at least .6 gpm to keep hot water flowing or else the burner fires then shuts fires then shuts and you get a sandwich effect...hot cold hot cold. If you have new diverter valve in shower -vs- old two handle type try turning hot water ALL the way ON and see if hot stays hot. If it does stay hot then slowly adjust to cool and see if you maintain a good MIX for proper temp. If it goes cold again try this......LOWER control pad setting to a comfortable 105 degrees (ladies) 100 degrees(men) and turn shower valve all the way to HOT. See if your temp remains consistant now and if it does then problem solved. Tankless mindset...set temp on control pad and stop trying to MIX at shower valve. Thats how these things work. Thats why I install a control pad in each bath and one in the kitchen for adjusting ash temp during dishwasher on time. ditto for wash machine. You should never need to turn on cold water if your unit is set to proper temp at controller. Hope this helps

May 17, 2010 | Rheem Tankless Hot Water Heater...

1 Answer

Rheem tankless water heater error code C4 13??


check diaphrapm valve or micro/switch best of luck

Sep 13, 2009 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

Hot and cold water from tankless heater


check your tigh/low water temperture setting. you may have them crossed.
check all of your wiring.

Jan 13, 2009 | Rheem RTG-53PVN Indoor Natural Gas...

1 Answer

Running out of hot water after 5 minutes or so in the shower.


I think the dip tube in your water heater has failed, this is a plastic tube that goes in the cold side of your tank and forces incoming cold water to the bottom of the tank allowing hot water out at the top. When this tube deteiorates the incoming cold water mixes at the top of the tank causing the problem you have. the dip tube runs about 5 bucks but takes someone with pluming skills to install.

Dec 31, 2008 | Water Heaters

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