Deciding between the NGM5458UC and its higher-output sibling at the same width is really a question about how you cook. This 24 inch 500 Series gas cooktop has four sealed burners and 25,700 BTU, and the lower total is easier to ventilate and kinder to the cabinets around it.
For everyday cooking it is plenty. The higher-output sibling, the NGM5456UC, only earns its place if you often bring large volumes of water to the boil. That distinction matters to us because owners sometimes call about slow boil times when the cooktop is delivering exactly what it was specified to deliver.
Its top is 23 inches wide, and the caps are lifted off every time the grates are cleaned, so they do not always go back the same way. Frying heavily can also foul the electrodes. On a visit we confirm the caps are seated, clean the electrodes, and check the flame on each burner.
Compare the flame to the others: steady blue flame all around the cap is healthy. If it looks the same on every burner, slower boiling is probably the rated output, not a failing burner.
Only if you often boil large pots. For daily cooking the lower output is easier to ventilate and gentler on the cabinets. It comes down to how you cook, not to quality.
Check that each cap sits flat and level on its crown before lighting the burner. A cap that is off-center is the quickest way to get an uneven flame.
Book in about a minute, or call the desk. Same-day windows inside the Loop on most days, next-day across the rest of Houston.