I am praying and to my right is a lit brazier; what is the ruling on the prayer?

Your prayer is valid even if there is a fire stove to your right or left, as there is nothing to indicate that the prayer becomes invalid on that account. The nullifiers of prayer are well-known, and this is not one of them. We advise you to perform prayers in congregation at the mosque due to the immense reward therein, and because many scholars consider it obligatory.