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schultz56 01-19-2011 08:15 AM

Adding a tankless water heater
I have recenly, within the last year, installed a new 50 gas water heater, but I am still having a problem with the amount of hot water reaching the 2nd floor shower. I was wondering if I can install an on demand tankless water heater at the shower location. Will this help? Should I put it on the hot water line or the cold water line? How can I determine the flow rate at my shower? Is the flow rate measured with both hot and cold on or just the hot?

Bondo 01-19-2011 10:06 AM


but I am still having a problem with the amount of hot water reaching the 2nd floor shower.
Ayuh,... I'd sooner think you have a problem with the shower Faucet, 'n adding yet another water heater won't help a thing....

1acman 01-19-2011 10:18 AM

Have you tried a recirculating pump installed under the sink for that bath? I have had good success using those in my home.

schultz56 01-19-2011 10:29 AM

What is a recirculating pump?

1acman 01-19-2011 11:36 AM

A recirculating pump will keep hot water in the lines so you do not waste water when you turn the hot water on. Check out your local Home depot or lowes, they will have one in the plumbing section. Have you tried turning the thermostat up on your water heater?

Navien Plumber 01-19-2011 11:49 AM

What is the size of the water supply pipe, both hot and cold going up to the bathroom?

schultz56 01-19-2011 12:18 PM

1/2" copper. Yes I have turned up tstat on tank.

Bondo 01-19-2011 12:44 PM

Ayuh,... Do you have good hot water else where in the house,..??
Do you have good hot water in other faucets in the same bathroom as this shower,..??

schultz56 01-19-2011 01:05 PM

yes good hot water everywhere, just doessnt seem to last long. I only seem to run short during/after a shower.

schultz56 01-19-2011 01:08 PM

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. Either way I thought the solution would be to add a point of use tankless water heater at the upstairs shower. Just not sure how to do it.

rditz 01-19-2011 01:24 PM

if you are running out of hot water after or during 1 shower, are you sure that both elements are working (assuming an electric water heater)?? did you turn both of them up?? what are they set to?


Jackofall1 01-19-2011 01:34 PM

If you can, before installing a tankless, POU, unit for your shower, insulate as much of the HW line as possible, I found that once I did this, even though I couldn't get in the walls, just the basement line was enough to make a big difference in longevity.

schultz56 01-19-2011 05:11 PM

It is a gas tank, and I already have insulated the lines in the basement. I could try putting one of those blankets on the tank itself. But I think I am at the point of requiring a pou tankless for the shower. I wonder if I could hook it up the hot water line. All info I have seen shows connecting to the cold supply.

terrylueders 01-20-2011 08:05 PM

I do not think you understand your problem yet. You do not want to fix it until you understand it. And, I think it could be the shower valve upstairs. If you can take a shower downstairs, you can take one upstairs. Its that simple if you have the same showerheads. If the flowrate of the showerhead upstairs is triple that of the one downstairs, that could be a problem. Switch showerhead and see if the problem moves.

Good Luck!

broox 01-20-2011 09:19 PM

I agree with what Terry said!

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