The main reason for buying a new generator is having the benefit of a manufacturer’s warranty.  These warranties vary significantly in their length

 

and terms but they tend to be between 1 and 2 years.  They can however sometimes significantly increase the overall cost.

 

Depending on the size and  manufacturer there may be a longer wait or limited availability than if buying a used model.

Comparison between new and used diesel generators

 

So if you have the time to wait and would prefer a full manufacturer’s warranty and the security that offers,

 

 

Something else to bear in mind is the timescales involved when buying a new generator.

then a new generator could be the right choice for you.