Is your baffle plates in the stove correctly? As One person report one time same stove and found the issue to be the baffle plates had slid out of place during shipping.
Where are you reading the temps?
What are you reading the temps with?
As those real dried bio bricks will burn really hot.
Not much to these stoves , the baffle plates and insulated fireboxes heat up and the super heated secondary air injects at the top of the box.
Basically same design for all these stoves just better quality workmanship in some of the stoves and fancier trimmings.
Here is one Home Depot Review with some advice:
I purchased this stove a month ago & we are having the worst winter in southern OHIO in over 25 yrs & was 3 degrees last night & it kept my home at 74 degrees my furnace come on this am only once & after getting the stove up & going again it has not come on since!! My home is around a thousand square ft in size & a sectional home & sits in the corner of my living room & is a nice piece of American workmanship! I cant get 8 hrs of burn time tho as stated but other than that I'm very pleased with it so far & would tell others to buy one. I purchased the small model & returned it due to issues with draft problems & was very hard to keep going if you don't have all seasoned wood as I don't!! This stove is a lot easier to start & does not kill the fire when you close the door as the smaller model did & you will save on wood due to how long it does burn on a load of wood in the fire box!! Do not block the air injection tube on the bottom middle front of stove cause it does burn a lot better if you don't "as stated in manual" I think if I had all seasoned wood small stove would of worked a lot better! But I do feel there is a draft issue with it & should be looked into & fixed BUY the medium or large cause it does work very well & I am very happy so far with it!!