Hearth Record

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Robert Bosch (Bosch) gas water heaters

1 report to CPSC, the latest made Feb 18, 2014. A report isn’t a recall.

Watch it to hear when CPSC publishes new reports about it. CPSC’s own search, on saferproducts.gov

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At a glance

From SaferProducts.gov, released Oct 25, 2026.

  • 1report to CPSC
  • Feb 18, 2014the latest report was made
  • Feb 18, 2014the earliest
  • 0with the company’s comments
Brand
Robert Bosch (Bosch)
Maker
BOSCH THERMOTECHNOLOGY CORP.Makers, importers or sellers, as the reports name them
Product
Gas water heatersCPSC’s product type: Gas Water Heaters (code 118), in Home Maintenance and Structures: Plumbing & Bath

By month

1 report from March 2013 to February 2014; the most in February 2014, 1.
The numbers, as a table
Reports to CPSC by the month each was made, newest first
MonthReports
February 20141

How badly anyone was hurt

  • No one hurt 1 CPSC: Incident, No Injury

As each report says it, in short words; CPSC’s own words are under each.

The reports, as CPSC published them

Reports people made to the U.S. Consumer Product Safety Commission. CPSC publishes each one after sending it to the company named, and doesn’t guarantee they’re accurate. A report isn’t a recall.

Each report is the words of the person who made it, as CPSC published them. The company’s comments, where CPSC published any, are set apart as the company’s own.

Source:

CPSC, SaferProducts.gov public database export. Released Oct 25, 2026. Updated daily.

  1. No one hurt

    Made Feb 18, 2014, sent to the company Mar 7, 2014, published by CPSC Mar 24, 2014

    The product, in the report: The product in question is a tankless water heater designed to provide hot water to a household. This particular model uses a standard Class B vent system and has a patented hydro ignition system (uses water to ignite the liquid propane gas). It is Bosch model 520 HN LP.

    I have a new Bosch 520 HN LP tankless water heater that we installed in September of 2013. We chose this water heater because the vent and hook up were an exact fit for the 20 year old [REDACTED] tankless water heater originally installed in our home. The Bosch water heater is designed such that the heat exchanger is placed near the vent of the water heater. As such, it has flash frozen four times since it was installed (freezes very quickly). The latest episode caused the tankless water heater to rupture the heat exchanger in two places, dumping water all over our basement floor. During this time, the heater continued to operate continuously producing considerable noise, heat and steam. Luckily for us, we were home at the time and heard the commotion in our basement. Otherwise, the heater would have continued to pour water on the floor and run continuously.

    I called Bosch before this incident to inquire about a backdraft preventer. They do not offer such a product for this water heater and do not seem very concerned about the potential for problems. The service people suggested that we contact an HVAC person to see if they could balance the house. As I mentioned, we had the previous tankless water heater for years without incident. It would occasionally blow out the pilot light from down drafts. But, the downdrafts were not a persistent problem and likely resulted from a rapid change in barometric pressure that causes an imbalance between the outside and inside air. We were convinced that an HVAC person would not be able to offer much in the way of solutions, particularly since the problem was so rare and episodic.

    Model
    520 HN LP
    Serial number
    7 703 431 996
    Bought from
    PlumberSurplus.com, California
    Bought
    Aug 10, 2013
    Where
    Duluth, Minnesota: Home/Apartment/Condominium
    Who was involved
    Age 56, Male
    The reporter’s relation to them
    Self
    As this report names them
    Brand Robert Bosch (Bosch), made or sold by BOSCH THERMOTECHNOLOGY CORP.
    How badly, in CPSC’s words
    Incident, No Injury

CPSC’s disclaimer

Disclaimer: CPSC does not guarantee the accuracy, completeness, or adequacy of the contents of the Publicly Available Consumer Product Safety Information Database on SaferProducts.gov, particularly with respect to information submitted by people outside of CPSC.

Source:

Word for word, from the disclaimer in CPSC’s export.

Sources

Sources

  • U.S. Consumer Product Safety Commission, SaferProducts.gov public database export.

    Released Oct 25, 2026 and checked Oct 25, 2026. Updated daily. Public domain (U.S. Government work). CPSC asks to be credited, and that no endorsement be implied.

Source:

Reports of harm are from the U.S. Consumer Product Safety Commission (CPSC), on SaferProducts.gov. CPSC does not endorse Hearth Record.

Back to Gas water heaters

How to read a record

Four things every record does, shown on an example record made up for this guide.

An example record, made up for this guide

An example nursing home

Made up for this guide: no real place is shown

Not fully inspected in over two years (CMS flag)

11 health citations at the latest inspection cycle

The state average is 14.3.

Source:

CMS, State and US Averages and Health Deficiencies. Released Oct 8, 2026. Updated monthly.

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1 of 4

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