Ways to increase heat output from woodstove

I planned on moving a stove from my shop to my house, but I cannot install the way my wife wants, so am wanting to change the stove to make it better and leave it in the shop.
I was going to take an undersized shop stove and replace it with a batch box. Since I won’t get much for the stove,  I wonder if I can modify it to make it better.  I have 3 barrels and a bunch of brick available.  Can I have the exhaust go into a double barrel to gain quick heat?  It works ok, but the shop is big and drafty.  I just need better output.  

Thanks!

Hi Michael;  
Sad that you don't get to build a batchbox RMH at this time, but yes you can help your existing stove with a barrel and bricks.
A double barrel is perfect.   One way that works well if your a welder... is drill and insert / weld multiple pipes from end to end. These pipes catch the heat and a fan placed behind helps move it thru your shop.
Another option (helpful if your barrel has a removable lid) Is partially fill the upper barrel with brick. leave plenty of room for heat flow and be sure the lower barrel can hold the extra weight.
Dry stacking brick around your stove will also act as a  heat sink.

Nothing will come close to what a batchbox could do, as far as amount of wood needed or exhaust emissions.  But all good things come in time...