Question about Bosch & Tankless LP Hot Water Heater

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Tp valve opening and dumping water

The tp valve on my aquastar tankless lp water heater keeps dumping water. I replaced the valve but the problem still exists. When I turn the hot water on, I get hot water but when I shut the hot water off, the valve dumps. I also seem to have lower water pressure (volume) within the house. Any ideas?

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  • georgeb527 Dec 23, 2008

    The pressure reducing valve had indeed gone bad. Once replaced (by the water district), everything was fine. Thanks so much.

  • Anonymous Mar 20, 2014

    I have stated the problem. Would the microswitch be the problem?

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Certain water heaters can only handle so much pressure from the main line. There is a pressure controller between your water meter and you house, it's called a pressure regulator. You need to call a plumber to check and see if it needs to be adjusted or even replaced.

Posted on Dec 22, 2008

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Open TP valve and confirm that hot water is available.
If water at TP valve is hot, then problem might be plumbing-related, for example crossover.
http://waterheatertimer.org/Crossover.html

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Before calling service technician, open following link for Bosch troubleshooting resources including contact information for Bosch:
http://waterheatertimer.org/Troubleshoot-Bosch-Tankless-water-heater.html

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Resources at Bosch
http://www.boschhotwater.com/HelpfulResources/TechnicalSupport/BoschAquaStarModels/tabid/370/Default.aspx
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Gas appliances are increasingly complicated and experienced technician is good resource to have in local area before installing tankless.

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Aquastar 1600H NG Natural Gas Tankless Water Heater Bosch AquaStar Model 1600H NG Natural Gas Whole house tankless gas water heater, 117,000 Btu input, natural draft with hydro-generated ignition. Provides endless hot water for one major application at a time . Can replace 40-gallon storage tank water heater. Optional Accessory: Model AQ1- Power vent with built-in... More freeze protection when venting horizontally. Capacity: 1 to 2 Bathrooms Dimensions: 8.75D x 18.25 W x 29.75H Weight: 40 Max GPM @ 45F Rise: 4.2 Energy Factor: NG .80 LP .84 Minimum Input: 28,000 Maximum Input: 117,000 Vent Size: 5 Gas Connection: 3/4 Water Connections: 1/2 Warranty: 12-year warranty on heat exchanger, 2-year on parts Features: Endless hot water Can save up to 50% off utility costs annually Perfect for one major application at a time No standing pilot, hydro generated

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