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Replacing a gas valve on a water heater will take a professional plumber between 1 and 1½ hours. However, they may require extra time to diagnose the problem with your water heater, particularly since so many of the surrounding parts work together. Speak with your plumber before the job to confirm the pre-hour price and the approximate length of the job.

Shut-off valves, like any other piece of metal hardware, can corrode, age, get worn down, and eventually break or rust into place. Occasionally spray your shut-off valve with WD-40 to stall it from rusting. If it really gets stuck, a wrench and WD-40 will usually do the trick, but you will need to call a plumber if it’s completely unmovable.

In some ways, yes, and in some ways, no. As for how they’re the same, propane and gas both burn via the same process, combustion, and at the same temperature, around 3,600 degrees Fahrenheit. The difference is that propane produces more heat per unit than gas. One cubic foot of propane contains 2,516 BTU, while one cubic foot of gas contains 1,030 BTU.

In North America, pipe measurements are listed as the nominal pipe size (NPS). This measurement refers to the outside diameter. As an example, a 1/2-inch copper pipe has an outside diameter of 5/8 of an inch. If a hardware store lists a pipe as having a 2 NPS, it means that all the pipes with this measurement have a 2 ⅜-inch outside diameter, regardless of wall thickness and inside diameter.