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Old 01-21-2011, 09:53 AM   #16
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Adding a tankless water heater


I am going to toss my support behind Terry also... Lets see if we can explain why

Water travels from Point A to Point B and hopefully it takes 1 path. Unfortunately your water seems to either be limited in that path or it seems to be getting additional water added to the line... Right now you are probably thinking WHAT!!!! So lets start with the basics

Option A
If Water is going from Point A to Point B with out any added water than I would lean towards the problem being at your Mixing valve.. Why not a "Cold Zone"? well if it was a Cold zone then you will get a Burst of Cold water that has been sitting in the cold zone and then it will go back to hot and remain hot because the water traveling past that point would be going at a rate that it would not have a chance to cool down quick enough to give you a Cold Shower. To test this theory put a gallon of water in a Bowl and toss some ice in it... See how long it takes to cool off. Now the other option if it is going from A to B would be the shower head using to much water but, I think you said that you did a test on that. Soooooo I will go with the Mixing valve

Option B
Now another theory that I have is that one of your faucets in your house is screwed up. By this I mean that normal faucets will not allow cold water to be siphoned through to the hot side. I currently have a Bathroom faucet that needs to be replaced because the hot water actually sucks the water through the valve and out the hot side. This added cold water can give us an occasional cold shower.


Will installing a POU water heater fix your problem?
I am going to say no it will not fix your problem but I do believe that it will fix your situation. Look at it this way... If your car has a bad transmission and you need to get to work... If you buy another car it will allow you to get to work so your situation is fixed but, the problem of the transmission is still there on the original car so your problem still exist.

Things I would look at
1- Is it all the time with the hot water?
2- Is it a timing thing? In other words is it when your wife is washing her hands? or something like that?
3- Do you use the toilet right before you shower?
4- When you run out of hot water in the shower do you have hot water at the sink?

I guess I am trying to say... You need more info. I teach people that when you are giving a quote... give 2... I for the problem and one for the situation they want fixed.

Good Luck!

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Old 01-21-2011, 10:04 AM   #17
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Adding a tankless water heater


Yes, after reading the threads again, I agree with the water heater being the main problem. And, its very likely one of the two heating elements are not working. End of Story ( I hope ). Good luck.
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Old 01-21-2011, 10:15 AM   #18
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Yes, after reading the threads again, I agree with the water heater being the main problem. And, its very likely one of the two heating elements are not working. End of Story ( I hope ). Good luck.
Gas Water Heater So doubt it is a Heating Element
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Old 01-21-2011, 01:05 PM   #19
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How old is the gas water heater? Its also possible that you are heating only the bottom layer of water. I do not think you have a full take of hot water. What size is it? And, watch the heater under demand. Does it crank up right away under demand of hot water. And, does it heat the complete tank. Still think its the water heater.
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Old 01-21-2011, 02:38 PM   #20
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Option B
Now another theory that I have is that one of your faucets in your house is screwed up. By this I mean that normal faucets will not allow cold water to be siphoned through to the hot side. I currently have a Bathroom faucet that needs to be replaced because the hot water actually sucks the water through the valve and out the hot side. This added cold water can give us an occasional cold shower.
I like this for a possible explanation.......and it reminds me of a funny. I recently did a rehab on a master bath for a neighbor. I installed the shower manifold, pressure tested it, and left for the day. The owner calls me the next morning and said while he was taking a shower in another bathroom, he kept getting blasts of cold water. I scratched my head for a moment, then realized I'd not installed the manifold guts. So much like Doc is describing, the cold water was entering the hot side.

Good luck!
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Old 01-21-2011, 09:56 PM   #21
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ok I have been away from the conputer for awhile dealing with a sick daughter. So first, the water heater is less than a year old and is a 50 gallon tank. I am interested in the cold water entering the hot theory. But I am confused about this could happen, and how it can be detected and how it can be fixed. I will say this other than the shower not staying hot for more than a 15-20 min. shower, I have no other problem with hot water. Before the old tank went, I had the same problem and thought a new tank would fix the problem, but it does not seem to have done the trick.

All this advise is great please keep it coming.
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Old 01-21-2011, 11:16 PM   #22
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A 15 minute shower is a long shower, in my opinion. What does everybody else think?

Does a lot of water come out the showerhead? I know that is tough to measure, but does it seem much more than your shower downstairs?
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Old 01-22-2011, 12:39 AM   #23
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I also have a shower in the basement, (the man shower), seem to have plenty of hot water when showering down there. Which makes me think that the problem is either the distance from the tank to the upstairs shower or onthe way to the second floor the hot water pipe must pass through a cold air zone somewhere.
Run the shower upstairs. When you run out of hot water, shut off the hot water and quickly go to the basement shower and see if it has hot water.

1. If no hot water in the basement either, then your problem is that the volume of your upstairs shower head is greater than your downstairs shower head.

2. If the basement shower has hot water, then there's something wrong with whatever is unique to your upstairs shower which includes the pipes, faucets or shower head.

Post the results of this test and maybe folks can help further.

Way out in left field, double check that the cold water into the heater is connected to the pipe labeled "COLD" on the heater. If the hot and cold water pipes are reversed, then cold water into the heater will be dispersed at the top of the tank which I believe will reduce the effective amount of hot water output. I said this was way out in left field...

HRG

Last edited by Homerepairguy; 01-22-2011 at 12:42 AM.
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Old 01-22-2011, 07:01 AM   #24
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Today is Sat, and I will be out the majority of the day. So I will try what has been suggested and post the results on tomorrow. Thanks all!
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Old 01-22-2011, 07:43 AM   #25
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Put a bucket on each shower for a few minutes and compare how long it takes to fill up a gallon. You will be amazed at the difference a low flow shower head will make.
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Old 01-22-2011, 08:03 AM   #26
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Put a bucket on each shower for a few minutes and compare how long it takes to fill up a gallon. You will be amazed at the difference a low flow shower head will make.
Now that's a good idea......
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Old 01-22-2011, 11:46 AM   #27
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To answer the question about a POU water heater, everyone I have seen wants the input from the cold water.

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