Question about Rheem 50 GAL FVR Propane Gas Water Heater 42VP50FP

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Does not have much hot water gets cold fast

Its a 21vp50E-1

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Tank water heater? if so its because the water is much colder this time of year. water heater has to work harder to heat 40deg. water than 70deg. water in the summer. That also means as you use the hot water from the tank its replaced with very cold water. Causing you to have less hot water. Either get a larger water heater. Or even better go tankless and have never ending hot water and save money at the same time.

Posted on Jan 12, 2013

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Posted on Jan 02, 2017

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1 Answer

T and p valve leaking and i replace it and pressure pushes out hot water


It sounds like it's doing it's job, by not letting your water heater turn into a missile, or exploding....The "T" in T&P stands for temperature. When it gets too high, the valve will open. The "P" in T&P stands for pressure. When IT gets too high, the valve will open. When they both get too high...you know the rest...The condition can be caused by many factors.
1. The house "pressure reducing valve" is letting in too much pressure. Any more than 80 lbs. is too much. 50 to 75 is good.
2. Hot water expansion in a closed loop system...no "prv" or "water meter" bypass...To fix, you can install a small "expansion tank" above the water heater. It will allow the extra bit of water to go somewhere temporarily, Letting the T&P valve stay closed. Installation is always on the hot outlet side, because high efficiency water heaters use a "check ball" in the factory installed cold water inlet nipple, which also doubles as a dip tube. (lets cold water into the heater at the bottom)
When a gas fired water heater turns on, there is a pretty fast spike in both temp. and press.
3. The gas control valve itself, has a non resetting 190 degree, "high limit" safety shut off feature. IF that were to fail, the control would run away temperature wise, but I have never heard of one failing.
regards!

Dec 06, 2014 | Rheem 40 Gallon FVR NATGAS Low WATER...

3 Answers

Water heater supplies about a pint of hot water than turns cold?? what is th eproblem


Hello Rsjohnson164,

I understand that you are having a problem with your hot-water tank not producing any amount of hot-water. I would suggest that you turn off the cold water supply to your hot water tank and drain the tank and see how much water comes out of it.

Flush the tank:
1. Turn off the cold water supply
2. Hook a water hose to the boiler valve (spicket on the bottom of the tank) and turn on the valve
3. Turn on the cold water inlet line and let it run for about 15 minutes or until you get good pressure coming out.

Check the Elements:
1. Turn off the power to the hot-water tank
2. Remove the service panels
3. Remove one wire from the element and use a multi-meter to check continuity
4. If no continuity replace one or both elements

If you do all of this and still have a problem repost to this thread and we will check your thermostats to make sure they are working properly.

Thank you for choosing FIxYa.com

Justin

Apr 21, 2011 | RELIANCE ELECTRIC WATER HEATER

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

1 Answer

I have powerstar model # 45557701- what causes the cracking noises when water is heating? what will make the unit slow to start to heat? how can i change the heating units?


The crackling noises is just from air in the water and should be of no concern. If you are having a problem of heating up the water with the unit it is most likely do to water moving too fast through the lines. Ideally, there should be a shutoff valve installed on both sides of your heater (makes for easy removal if it needs to be serviced). But if you turn off the valve about 1/4 to 1/2 way on the one on the "in" side of the heater (where the cold water enters) then you will slow down the water going through the heater and this will give the water a better chance to heat up. This should alleviate the heating problems you are having. If you do have a shutoff valve on the cold (in) side of the heater, shut it off about 1/4 to 1/2 way and then go to your shower and turn the hot on all the way (no cold). Wait for the water to warm and test the water by hand to see if it is the temp you want. If it is still not warm enough, turn the hot on the shower DOWN just a little. This will actually make the water hotter. I know this doesnt seem right but it will. On the other hand, if the water coming out with the hot water fully turned on is too hot, then just turn on a little cold water at a time until the water is the temp you want. Remember, always give the water plenty of time to get from the heater to the shower before you decideof its the right temp. Ideally, you should be able to turn the hot water on all the way and get the hot temp that you want and if you want to cool it down, just turn the cold on just a little bit until it is where you want. I'm fairly sure the problems you are having are due to the water going too fast through the unit and once you adjust that and understand better how these tankless heaters work, you wont have any more trouble. They are difficult to get used to after using conventional water heaters and the manufacturers arent very good about giving you these hints so they will work properly. You will need a professional to uninstall and hopefully this will work and you want have to. But if you do, it requires shutting off the water to the unit. Shutting off the pwer to the unit. Unattaching the water lines to the unit and then unattaching the electric lines from the junction box or wherever they are attached. The heater then can be removed from the wall by unscrewing the screws from the hangers which hold it to the wall.

Feb 21, 2011 | Bosch PowerStar AE115 Tankless Water...

1 Answer

I have a Rheem Power Vent hot water heater. Model 21VP50E-1 A. The hot water heater makes hot water and keeps up with demand. Problem or no problem: main burner cycles on and off in about 5 second...


I see your question posted under JJ, and will also watch for the answer.
The Tank has amazing amount of water heater information. But the industry is also changing very fast.

Feb 18, 2011 | Water Heaters

1 Answer

How does rhe hot and cold water hook up on a 71-40d which is which top and bottom


Tanks are marked with Hot and Cold.
1) If water connections are on top of tank, look for red marking or word HOT that shows where hot water pipe connects. Look for blue marking or word COLD that shows cold water connection.
2) If water connections are on side of tank, cold water connects to bottom one, and hot connects to top.

3) If hot and cold are reversed, the tank will not work.
Pipes on top of tank: cold water enters tank and is sent to bottom of tank in a long tube called the dip tube. This means the cold is on the bottom since hot water rises to the top. The hot water exits top of tank.
Pipes on side of tank: You want cold water to enter bottom, so hot water naturally rises to the top outlet.

Nov 14, 2010 | Rheem 40 GAL ELEC TALL Water Heater 6YR SC...

1 Answer

Hot water wont get hot


1-First check for power to water heater and remove acces panels on heater to check power at thermostats. Thermostats have a reset button on them that trip and can be pressed to reset.

2- If none of the above have changed any thing and you have power you may have elements gone bad.

If an element is gone at top you will get scalding hot water then go to cold.

If an element on the bottom is gone you will get luke warm water then will get cold.

May 17, 2010 | Water Heaters

2 Answers

We have a customer that has a 751od who says at times thier water gets cold for a few seconds. No error codes on the remote. They claim it does it at different fixtures. Everything checks out from water...


A few things you should check:

1. Cross Connections - this occurs when cold water leaks into the hot water system through a fixture. In order to check for a cross connection: 1) turn off the cold water to the tankless 2) open up hot water fixtures in the home. The water should shut off at all hot water fixtures; if there is a continuous flow of cold water, then you have a cross connection. The most common place to find a cross connection is on old shower cartridges.

2. Ask the customer to check to see if the burner indicator is continuously lit during operation.

3. When the water goes cold at one fixture, try another near by fixture to confirm it is also cold there. If its hot at one fixture but not the other, then you have some issue with you plumbing. Tankless heaters can't pick and choose which fixtures to deliver hot water to.

4. Tankless water heaters all have a minimum flow rate that must be maintained in order to continually fire (.5 gpm for Noritz). Ensure their hot water fixtures flow at least this amount, or that the customer isn't mixing too little hot water at their fixture.

5. If they see the cold spurt during initial firing, they may be experiencing a cold water sandwich. When the heater moves from a standing state to a firing state it takes a short period to ignite and heat water. During this time it will be passing cold water through the system. Usually this cold water mixes with hot water in the line as it travels through the plumbing system, but if their fixture is very close to the heater, there won't be enough time to mix.

6. If debris has gotten into the flow sensor, this can prevent the unit from registering flow and cause intermittent firing.

Aug 27, 2009 | Noritz 7.1 Gpm Natural Ng Gas Tankless Hot...

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