The smell of an odorant added to LPG (propane) suddenly appeared in my washroom. I checked all plumbing connections for leaks, including the inlet and outlet of the gas lines in the water heater control box, using a Harvey leak detector. No leaks were found although the odor remained strong. I contacted the manufacturer of the water heater and he sent me a document with a reference to the technical standard according to which the valve in the control box has an allowable leakage. Protecting my home was a priority so I turned off the gas and ordered this gas detector. It detects combustible and combustible by-products of combustible or explosive gases and displays the information on a bright color screen in three selectable values. Values are displayed as numeric values and as a graph. If the level becomes dangerously high, an alarm will sound and a response is required. The controls are easy to use and the instructions are clear and logical. The gauge worked fine and confirmed the leak was inside the control box and came from a seam around the box. I did a simple test with the burner on my stove to make sure the gas analyzer (detector) was working properly. What the manufacturer of the instantaneous water heater didn't tell me is that the control valve in the control box relies on a certain pressure in the tank in order to generate the pressure according to specifications. When I cut off the gas I found the tank pressure gauge stuck and after a few nudges the volume gauge dropped from just under 1/2 full to almost empty. When filling the tank and restarting the water supply to the water heater, the sniffer found no noticeable leak. Although this gauge is not the data logger that would be required to determine if a control valve is leaking to specification, it saved me the hassle of calling a licensed plumber and gave me peace of mind that I was restarting my water heater and having a hot, relaxing one Shower. I'm not going to be using this gauge as often as a plumber, HVAC technician, or inspector, so I pull out the included triple-A batteries and set it aside for the next event along with my electrical test equipment. I asked if the gas company had such a meter and the answer was no. Calling a toll technician near me is much more expensive than the price of the meter. I would recommend this gauge for use here.
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