Converting a small fridge to brewery accessory

[RANGER1]

Heating element, light bulb and heating element are all good suggestions for the sake of simplicity. However. If I'm not mistaken; a reverse cycle system is the most efficient way of generating heat in a closed system.

Would I be able to control such a system with a stc controller? Or am i required to use some of the expensive Danfoss controllers?

Depends, you do not say how big your small refrigerator is?
If you are making small quantities how are you going to compare with a 100 watt light bulb.
Reverse cycle need a lot of thought & design work.
What will be your ambient temperatures.
Where will the condenser , now evaporator on reverse cycle be.