The Ministry of Economy, Trade and Industry said Friday there have been no carbon monoxide poisoning accidents caused by alterations to safety devices of gas water heaters made by makers other than Paloma Industries Ltd.
The ministry said it looked into products of 12 water heater makers other than Paloma and found that no such accidents have been confirmed from products of 11 out of the 12 makers.
Investigations are still under way into a March 1994 carbon monoxide poisoning case in Miyagi Prefecture in which one person fell seriously ill while using a water heater made by Osaka-based Harman Pro Co., an affiliate of Osaka Gas Co.
Officials said the cause of the 1994 accident is not known.