My Bosch Water Heater is Noisy.

My Bosch Water Heater is Noisy.

by Frank
(Seneca Falls, NY 13148, USA)

I have a Bosch AquaStar 250SX Tankless water heater (propane). It makes a humming noise when the hot water is turned on and then we get intermittent hot water in the shower. What is the cause and fix for this? Thank you.

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Nov 04, 2015
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Possible Problem and Fix for Noisy Bosch Tankless Water Heater
by: Frank

I called Bosch and explained the problem. Possible cause: is incomplete/insufficient combustion of exhaust gases that the unit senses causing intermittent hot water. Fix: contact a certified gas tech/plumber to bring both a Manometer (measures LP gas pressure at the unit) and an CO2 Analyzer to help read and adjust CO2 percentage of combustion gases, according to the tech at Bosch, 800-642-3111.

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