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Posted on Jan 02, 2017
SOURCE: Shower goes hot and cold
If you are having trouble only at the one fixture (shower), and no where else, the problem is most likely in the shower valve...which either needs new cartridges, or a complete replacement.
hope this helps
Posted on Jan 08, 2009
Okay let's trouble shoot this problem. The Hot water issue may just be that your Temp. control is not set as high as it was before it was replaced. Find the control on the water heater and check the setting. You can adjust it hotter from there, but it is not recomended to set it all the way to HOT. Just increase it at small adjustments and see if the water gets hotter. The Cold Water Tap issue.....Turn off the Cold and Hot water supply lines to the faucet. Remove the Cold water tap. VERY SLOWLY TURN ON THE COLD WATER SUPPLY and see if you get water coming out of the line. If you get water, then your line is okay. Inspect the valve to see if there is any debris in or on it. Clean and reinstall both taps and turn back on the water. It should work. Now if you turn the water on SLOWLY when the Cold water tap is removed, and no water comes out, Then you know you have an issue with the line going to the cold water side. (Frozen Line, Debris in supply line valve, Broken or Leaking Water Line) I hope this assists you........Joe
Posted on Jan 16, 2009
It sounds like the Rinnai units are working correctly but you've got some plumbing problems. Any tankless heater has a minimum water flow required to keep the burners going. If the burners were going with very little water flowing through them to carry the heat away, the heat exchanger could overheat and fail. The solution is generally to the electronic controls to set the desired temperature and then just use hot water. Once you start mixing cold water in, you actually reduce the flow of hot water and the burners turn off. If you are right near the cut off point, the burners will cycle on and off resulting in those very annoying hot-cold-hot-cold showers.
The fact that you've got those very loud noises indicates some other sort of plumbing problem. Hooking up two tankless units in series is much more complicated. In heavy draw situations, the second unit is asked to finish heating the water up to temperature when the first unit couldn't quite get it there. Now you're putting hot water into a heater and heating it more. You have a lot more issues with fluctuating temperatures and pressures within the pipes which could conceivable cause these horrible noises. Everything's got to be set up right to for things to function properly and it's easy to get something wrong.
From your description, it sounds like a better solution would have been to mount the two heaters in different places. e.g. One in the basement to serve basement and first floor faucets. The other on the second or third floor to serve those two floors. Since these units are direct vent (don't use inside air), they can even be mounted in a closed closet as long as the vent can get to the outside. With this setup you avoid the complexities of a series installation and you also have a much shorter wait time (and therefore less waste) for the fixtures on the upper floors.
Posted on Jan 22, 2009
You aren't the first to run into this dilemna.
The size of thhe pipe will affect your system in this way.
If you start 85lbs of pressure in the water main, The meterhas a 1" pipe inlet and a 3/4" outlet. The meter reduced thhe pressure to60 psi and then it is reduced again at the point of entering the structure dropping to 1/2" pipe. By resucing the pressure is upped approx 5-7 lbs. The point of regulator and pipe size is the only time the pressure changes. The lowest pressure will drive a rainbird spribkler,actually several. But too many rainbirds won't affect by pressure as much as volume. The pressure will push whatever is available.By reducing the 3/4 to 1/2" didn't affect your pressure as much as it did your volume.. The reason your hot water starts to run cold sooner is that now you do not have the volume ratio between the cold and hot.It 's 1:1 now instead of 1.25:1. Hot more than cold. It takes more hot water to heat cold water than ittakescold to cool hot. Plus, the hot water you use is being replaced by cold water and that water is cooling what hot water is in the tank as the heat moves to the cold. The heater cannot heat al that water fast enough, but the cold water line is happy as can be.No pressure changes and no temperature changes. Before, you had to turn up the cold to bring the temp down to comfortable or safe. I just had my shower redone and everything is the sme size. Here is something to think about. Ck the shower head. They clog up and cause poor mixing over time. Yoou should be ok. How old is the water heater? Over time they get a build up of calcium and lime which is very detrimental to the heaters efficiency and recovery time. I hope this all made sense to you. At times when we have things done right it seems to be wrong because we are accustomed to the way it was. You will get accustomed to it and find your water heater gobbling less energy. Good luck and I hope it all works out, There is no need to fret. Sincerely -Ned-
Posted on May 26, 2010
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