Hello, Shariq -
I have not been able to find an English language translation of the user manual for the Osaka Gas heater model 43-450 online. I only find the Japanese language manual (24 pages):
http://www.osakagas-info.net/pdf/43540.pdf
There is a Japanese language online forum, where you may find someone fluent in reading and translating Japanese who will be kind enough to provide you with a translation:
https://jref.com/forum/threads/translation-for-osaka-gas-heater-43-586.56175/
You will need to register with the forum first (free.)
Or, you can look for a translation service (which you will have to pay) to translate the Japanese manual into English. I have no idea where you reside, so I cannot search for any such service in the area of the world where you reside.
Fixya receives questions from people worldwide. I am answering from the USA.
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