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My hot water doesnt last more then 12 min in the shower. Any ideas why or how to fix it?

I only get about 12 minutes of hot water while in the shower . The tank was put in 2009.

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The tank is too small, the recovery time for gas water heaters it quite long. One of the best solution is to have a tankless heater which only heats as you need it saving money and you never run out of hot water some factors are the size of the home the the rate of water flow ( the slower water flow the hotter the water)

Posted on May 01, 2014

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One of your heating elements most likely burnt up

Posted on Apr 20, 2014

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Posted on Jan 02, 2017

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1 Answer

Bosch gwh 425 hn


Fix problem immediately same day, yourself, for $385, by replacing whole thing:
http://waterheatertimer.org/How-to-install-gas-water-heater.html
Bosch posts some service manuals: or contact Bosch. Lack of error code indicates failed PC board? or bad single-handle faucet cartridge?
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html
Check for crossover where bad faucet cartridge allows cold water to enter hot pipe, so hot water is not drawn through tankless and burner does not activate... but this might not be problem since you hear the tankless clicking
http://waterheatertimer.org/Crossover.html
Call local service technician to catch up on required yearly maintenance.

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I installed a 30 gallon gas hot water tank and sometimes i get strong water pressure but my hot water doesn't last long enough for 2 showers, but if i have low water pressure we can get in 4 showers. Any...


At a high pressure you are consuming more hot water. It sounds to me like the water heater isn't big enough for what you need. You can try turning up the heat thermostat on the water tank. If the water gets hotter you won't need as much for each shower and it will also recover faster at a higger temperature.

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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 :)

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If not ,try setting the heat up a little higher on it until you have more then a 5 min hot shower.

May pay you to get a 100 gallon heater.

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have you checked the error codes on the heater?
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1 Answer

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you have to much volume of water going thru the unit, did you size it properly by haow many baths and showers you have or did you just by the cheapest one,, there is a scale to go by run just one shower and see if it changes temp, with nothing else running,, a shower has 2.5 to 4.5 gal per min,, then you can also check to make sure it has the right size gas line 3/4 from the meter to the unit is required at a min of 2lbs of gas

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check the screen on the cold water intake on the cold side,, you might have to flush the system out, and do you have the shower head water restricter in, if not you may be using to much hot water,,, how many other hot water fixtures are running at the same time? try running just the shower,,,if this is a tank water heater the dip tube could be bad that is on the cold side it takes the cold water to the bottom of the tank and forces the hot water out,, if you ar only getting a couple of min of hot water and the dip tube is bad it is not going to the bottom but just at the top and not getting all the hot water you will need a plumber

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1 Answer

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