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Simply boiling water inside the heat exchanger then the pressure will break the valves, until this moment someone will notice the gas still running then will close the source. Nothing will blow up; At any moment there won't be enough gas inside the heater to blow up. BTW, it seems this water...

The gas shutoff when the water pressure inside the diaphragm gets lower than the spring power pushing the diaphragm so the other rubber that shutoff the gas close. what i did is removing the rubber that closes the gas so it's always open disregard water pressure. btw, there are RGI's in Jordan...

Hello I'm new here and appreciate any help I have a very old water heater (more than 30 years old), currently it works great but only manually, ie there is no gas shut off since the diaphragm is punctured, i know it's dangerous so i take the at most precaution when i use it. It been like this...