If you compare this furnace with the industrial furnace from AAI industries it is too cheap.

industrial furnace has a production of 4.0

https://imgur.com/a/NTLRYsg

I would suggest amping the production cost of the building to 50 instead of 20 furnaces and increasing the power consumption accordingly.

True, I didn't spend too much time thinking about recipe costs.
So I beefed up recipes a bit, added concrete to both tiers, more furnaces for MK1. MK2 requires 2 MK1s and processing units instead.
MK1 crafting speed 100, energy 7,5MW -> 20MW
MK2 crafting speed 150 -> 200, energy 10MW -> 50MW
I hoped people will adjust it to fit their playstyle/difficulty.