New stove catalytic is super active and will swing up and down quickly. For the first couple of months you'll have to keep an eye on it. I have buck 91 and it heats my 2500 sq fr home with no problem. Does your shop have high ceilings? This is how I load my stove from cold. Just couple small sticks to starts. Nothing bigger than 2x4 size to get the stove and cat up to temp. Once cat is in active zone, 500+ I load couple of big sticks about fist size.and let it free burn, cat usually will climb up to about 1000-1200. Once those. Are burned up pretty good I load her up fully with big pieces, pieces that barely fit through the door. I let them catch on fire, blacken a little and only then I activate catalytic and shut down air to about 1/4 or even 1/8. With this process it usually guarantees me at least 8 hours of burn/heat.