Question about Terminator Aquastar 125FX Tankless Water Heater: FX Hood Horizontal Vent

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Gradual decrease in water temperature

My aquastar is approx 6 years old. The water temperature has gradually decreased over time with the same inlet temperature. The unit lights correctly. It is a natural gas unit. I have never performed any maintenance. Any ideas?

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  • Gary Davd
    Gary Davd May 11, 2010

    i suggest you clean and flush the unit and install a Sediminate filter on the feed side

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  • 25 Answers

Rebuild the watervalve or replace it. 6 year old unit means its probably one of the 125 series. Probably a polymer gray water valve. Pay attention to the venturi, most likely its very dirty. You can get instructions off the www.boschhotwater.com websight to rebuild this.

Posted on Jan 19, 2009

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Posted on Jan 02, 2017

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Hi mike_poulton,

I'm Harvey the master Plumber.

Your question is: You have one of the above models and it has been a fantastic dishwasher but now it seems not to take in water even on rinse and the timer does not decrease.
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Feel free contact me again!
Please give me a rating here at fixya.com before you sign off
Thank you,
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