Perhaps it helps to understand the differences:

You installed a Pellet Stove to replace a wood stove, in your House.

Or;

You installed a Pellet Stove to generate Heat, using it to turn a turbine to generate electricity, which you sell to the electrical grid.

One is personal residence improvement. One is generating. Also, there can be conservation projects, alternative fuels, etc.

Have you used the IRS resources?

https://www.irs.gov/pub/irs-pdf/i3468.pdf

https://www.irs.gov/instructions/i5695

All of these instructions include, in the first part, Why or Who uses this form.

I had a client several weeks ago that brought a pellet stove, he brought all the paperwork for the tax credit that it qualified for, look for biomass fuel property credit on 5695 and see if your stove meets those qualifications.

Pellet Stove = Biomass. You might not see "pellet" but you will see "biomass."