On Tuesday, June 16, 2015 at 11:53:39 PM UTC-4, Arthur Conan Doyle wrote:
Andy wrote:

Is it worth buying 4 more burners or go for a new grill ?

If you are to the point of replacing parts, I'd buy a new grill.

I'd say it depends on the condition of the whole thing, how
old it is, and what the cost of the replacement parts are.
Typically besides the burners, the flame spreader bars go too.