Domestic gas burners are widely used for household cooking in several countries. With the advent of climate change, there is a need for cleaner combustion. Predominantly, domestic gas burners utilize Liquefied Petroleum Gas (LPG) as a fuel for burning. It is a mixture of several hydrocarbons, with butane and propane being the major constituents. A better alternative for LPG is Natural Gas (NG), which mainly consists of methane, and it releases lower carbon emissions compared to LPG. Due to the differences in chemical characteristics of these fuels, a different burner design is necessary for firing methane. Numerical simulations are helpful in these designs. The present study aims to develop a numerical model that can accurately predict the temperature fields and carbon monoxide (CO) emissions for a multi-slot radial methane burner. The burner has been studied under two configurations: open flame and burner with vessel. Of these, the latter configuration has already been studied in the literature extensively. However, numerical studies on open flames of radially slotted burners are scarce. The results from the present numerical model match quite well with the experimental data, with an overall accuracy of 80% or more in the temperature and CO predictions.