They are correct that there is no lifetime limit. That means that you can buy another one.
Unfortunately @BrittanyS is correct - the Biomass stove credit is limited to only the year in which you make the purchase and only up to your total tax liability or $2000. In your case because you didn't owe more than $2000 in taxes this year you did not get the full benefit of the tax credit.
@secane6-q
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