Question about Bosch 1600H-NG Natural Gas AquaStar AquaStar Natural Gas Tankless Water Heater...

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Hot at showers but not at sinks

I put this heater about 3 weeks ago, we have great hot water at the showers but not at any of the sinks. I dont run any 2 things at the same time.I've tryed to ajust the settings and it dosent seem to make any differance.

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  • Azz
    Azz May 11, 2010

    Are you sure the showers aren't heating the water? Mine does.

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THIS IS CALLED A CROSS OVER IF YOU HAVE A ONE HANDLE FAUCET WHAT YOU NEED TO DO IS CHANGE THE CARTRIDGE.

Posted on Jan 25, 2009

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Do your sinks have a hot and cold handle or just one handle. how old are the faucets. If they are very old.the first thing i would do take one faucet out and replace cartridge.

Posted on Jan 23, 2009

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I have to turn the hot water tap on full open to get hot water


Type of water heater is unknown
If you have single-handled faucet the faucet cartridge might be bad.
If you have recirculation system, then check valve might be bad.
Copy following links for troubleshoot.
http://waterheatertimer.org/Crossover.html
http://waterheatertimer.org/How-to-troubleshoot-electric-problems-with-water-heater.html
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html

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3 Answers

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3 Answers

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I found a way to get warm water in the shower, but I'm not sure it qualifies as a solution. After trying everything else I thought that maybe when I was feathering the faucet in the shower toward the cold side so I would get warm water that at a certain point it blocked the flow on the hot water side enough so that the sensor in the hot water heater sensed there was no demand in the line and it shut the water heater off. To test this, I went to the kitchen and turned the kitchen sink faucet all the way to the hot side and then turned it on so that I got a small flow of water. I waited for the water to get hot to be sure the hot water heater was working. Once it was hot, I left it running to keep demand in the line and then I went to the shower and turned the faucet on. When the water got hot I started feathering the control towards the cold side and soon I had warm water. So I think I'm right in that the sensor in the hot water heater was shutting the water heater off when the demand in the shower was lowered to a certain point when I was trying to adjust the water temp in the shower.

So now I can get warm water, but it means I have to leave the hot water running at another fixture in the house to create a false demand in the system so the hot water heater doesn't shut down. Is there a way to adjust the senor in the hot water heater so that it will stay on when I'm using the shower only, so I don't have to waste water by running another faucet when I want to take a shower?

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