Question about Terminator Aquastar 125FX Tankless Water Heater: FX Hood Horizontal Vent

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Hi, We have one of your tankless hot water heaters. At about this time of the year in southern CA it is difficult to take a shower. We run either really hot or really cold. Is this due to the water tanks in the city being on a hill and catching the suns warming rays? If "YES" or "NO" what can we do to correct this situation? New shower heads?

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Your water in southern california is very hot during the summer months. I would try pulling the aerators out of the sinks and shower heads and also pull the inlet screen out of the watervalve connection on the heater itself

Posted on Jan 19, 2009

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I own a salon and have 2 Rheem 60 gal 50,000BTU Gas hot water heaters. I am still running out of hot water during the work day. My question is because the hot water heaters are on the 3rd floor, it is...


I think before I spend the kind of money to get a tankless added I would get the rheems serviced . two should produce more hot water than 30 people could shower with all day

Feb 21, 2015 | Rheem Water Heaters

2 Answers

Hot water varies


I do not know how old this unit is or what model but many water heaters are not sophisticated enough to measure the temperature, but heat based on water flow and temperature rise. To start, tankless water heaters turn off every time you turn the hot water off. Lets use an example. You use the facilities, wash your hands then turned off the water and take a shower. You will bring the already heated water (from washing your hands) from the pipe up to the shower. Then the cold water that comes into the pipe from the reactivation of the water heater comes up the hot water pipe with warm then hot water just behind.

If this is not your problem, keep reading. Every unit I have been called to see were installed wrong. Check your installation manual to see if the problem with the system started with the contractor.

First, check the temperature of the water from the heater. If it is too hot and you are mixing too much cold water in, the unit will turn off because there is not enough water flow to keep it running.

Second, turn off the valve at the water heater and turn on the hot water at a faucet. If the water does not stop running, there is a "plumbing cross over" usually caused by a failing pressure balance valve in a shower.

Third, if the unit has not been serviced, go to bosch-climate.us to find a tankless water heating professional in your area. Totally Tankless LLC

Mar 14, 2014 | Bosch & Tankless LP Hot Water Heater

1 Answer

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

The eco 180 dv tankless water heater will not turn on unless you run the tub/shower and lavatory at the same time. Running only one fixture at the same time will not kick on the water heater.


You have tankless water heater, and no error code.
Burner does not activate with one faucet, but activates with 3 faucets.
Best suspect is crossover:
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/pdf/No-Error-Code.pdf
Problem can be a combination of causes including Tankless part failure: sensors are not working, PC board is bad, wires are loose. Call service technician to catch up on yearly maintenance and troubleshoot problem. Tankless water heaters require yearly maintenance.
http://waterheatertimer.org/Troubleshoot-Rheem-Tankless-water-heater.html

Jul 21, 2011 | Rheem EcoSense by 7.4 GPM Tankless Water...

2 Answers

I have a Marey LPG tankless heater. The water temperature fluctuates. At my kitchen sink - warm water. In my bathroom shower lukewarm water. At my outdoor shower - nice hot water. How may I fix this...


Ok i intall tankless water heaters and sell them and repair them . The trouble your are hving is more than likely ,the mixing valve on your shower has a ajustment on it to prevent you from burning your self . that is the number one reason in showers when water never get to temp . What it is doing is addng cold water to your shower for you bummer . Take handle off and adjust water temp to your hottest setting . Some times you have to remove the low flow washer in shower head to get the right flow . also every time you start up your hot water it shouldbe set all the way ot other wise withe the battery 2 D models the unit will not sence flow and shut off the unit ,with some units it is a fine balancing act to get them adjusted right. If your buying a tankless water heater always buy a blower type unit that has a computer that runs it . You will be happy . If the Battery operated unit is for a cottage or a smallcabin then your just going to have to fix the pumbing to make it work right many of the safety features of the newer showers are not made to work well with tankless water heaters .
4_5_2012_1_19_13_am.jpg

Apr 16, 2011 | RTO Lp Gas Tankless Water Heater By Marey

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

I have a Titan tankless hot water heater. I get hot water from the faucets but not in the shower. Do you have a solution?


try opening the faucet and the shower at the same time. some shower heads don't draw enough water for the tankless to fire.

May 20, 2010 | Kitchen Appliances - Others

1 Answer

Tankless on demand water heater.


Tankless water heaters normally take a little longer than a regular heater to provide hot water because they have to start and get warmed up. I'm guessing the heater uses a pilot light and that the short amount of hot water when you turn on the tap is hot because when the water is sitting still in the heater the heat from the pilot light is enough to get it hot. The tub faucet will get hot a lot faster than the shower because it lets a lot more water through and empties out the pipes faster than the shower. You could probably speed things up by letting the tub faucet run on completely hot for like 10-15 seconds and then turning on the shower.

Oct 24, 2009 | RTO Takagi Jr. TK-JR-N Tankless Water...

1 Answer

Tankless water heater: cold sandwich effect. While showering, hot water stops for about 1 min and then runs again. Was fine for 5 years.


tankless water heaters are a great appliance with one small draw back they require a constant flow of water through them to maintain production of hot water if the water presure fluctuates they can cut out momentarily or if your water supply is less than great ie hard ,high iron,
sulpher ect.. then the heat exchanger can become plugged over time like say 5 years. Contamination of the flow sensor/presure switch could also be a culprit depending on how handy you are a through cleaning with a good kettle descaler will probably help.
Good Luck

Oct 07, 2009 | Water Heaters

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