Version: 1.11.2. I am using the latest version of TechReborn.

I just did a small test with the vanilla furnace and TechReborn’s iron furnace, and here are the results:
The vanilla furnace smelts eight items per piece of coal, and the iron furnace smelts ten items per piece of coal. This is all good, but the problem is that it did not smelt the items quicker, which the IC2 iron furnace does.

Fixed with: 21dd44d

@modmuss50 Thanks!