boiler selection with minimum cost using GDP.

Respected teachers and seniors,

I want to select one boiler out of two using the general disjunctive programming with big M, I tried but I am unable to solve it please help
[attachment=1]boiler selection.gms[/attachment][attachment=0]equations.PNG[/attachment]

Thanks in advance.
equations.PNG
boiler selection.gms (1.22 KB)