Question about Bosch PowerStar AE3.4 AE3.4 Point-of-Use Electric Tankless Water Heater...

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Water doesn't stay hot PowerStar AE3.4

Kitchen sink is all the way across the house from the water heater. Takes forever to get hot water. Put this unit under sink to cure wait. Water gets hot quickly, but after running water for a couple of minutes it is just tepid. Have reduced flow aerator to keep max flow rate in limits. Instructions say it can't be hooked into the hot water line. Why? Seems like that would cure both my problems. Unit will heat up water cooled in piping from water heater and than I get heated water from tank.

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Apparently the software in the brain of the unit is not capable to modulate for smaller heat need and it trigger off the unit when it only need less the 20F temp increase . That is a lack of engineering in the brand unit, and really can not be "fix"

Posted on Feb 02, 2013

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Are you using a single lever faucet? The install guide does indicate that you may need to reduce the input from the cold water side to ensure that water stays at a consistent temperature (see page 7 of the installation and service manual). Also, remember, this is a SMALL hot water heater. So if you're running for any length of time at full output, it may not keep up with you (see page 8 of the service an installation manual). I found the manual online at http://www.airwater.biz/images_templ/bosch-water-heaters-ae3.4-manual.pdf.

Posted on Feb 01, 2009

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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.

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