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We have a new Bosch AquaStar hot water heater. It is currently set on 104 F. After taking a shower for about 2 minutes the water cools off dramatically but then will become hot again in another 2-3 minutes if you let it run. Help!

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Hello
Is there somthing else in the home that uses water automaticly?
Such as a sprinkler system,ice maker,maybe a toilet running.

Next,check for air in the hw heater,on the hw heater is a relief vavlve.get a bucket and hold it open for 15 seconds or 30 seconds.Please be carefull this water will be hot.If air is trapped in the water line it can cause cool water on occasion.

Posted on Sep 09, 2010

  • mpcheesman1
    mpcheesman1 Sep 09, 2010

    Also i keep the hot water temp at 112.f you may want to raise it some.

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This should run two showers at once with no problem. If you have a shut off valve on the cold side of the heater, try closing about halfway. This will slow the water flow and the water will have more time to heat up as it pases through the tank. If you dont have a shut off valve, just cut back the hot water valve on your shower and do not use any cold water. If it gets too hot then turn on a little cold water. The object is to slow the speed of the water going through the tank. Tankless heater take a little getting use to but they work great when you know how to treat them. On my shower I turn the hot all the way on until it gets hot and then add a little cold water to bring the temp down. You may have too much water going through too fast to be able to heat it up to what you need. Try this and see how it works.

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Paragon 8145-20 is a 240V defrost timer
It is probably not best choice for water heater timer
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A water heater timer should have more scheduling options.
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-To save money using water heater timer, you have to schedule times carefully so water heater runs less than 3 hours per day.
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I suggest Intermatic WH-31 240V or Intermatic T-104 240V or GE 15207. These are mechanical repeat-24 hour timers with manual override where each day has same schedule.
Digital programmable timers like Intermatic EH40 offer 7-day, 40 event programming. Weekends and weekdays can be different.
To see several box-type timers:
http://waterheatertimer.org/Boxtype.html

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