Vastu experts call Southeast the Fire zone because according to Vastu principles, this direction is associated with fire zone. This isn’t about a physical flame. It represents every form of energy that creates heat, transformation and action.  
Your home is a living body as shown:  
The Southeast is like your stomach and metabolism—- it produces the energy that keeps everything running.  
Our body needs healthy digestive fire to convert food into energy. In the same way our home needs a balanced fire zone to support activity and productivity.  
Also fire represents transformation:-  
Raw food becomes cooked.  
Ideas become action.  
Effort becomes results.  
So , activities which involve heat and energy are placed here:- kitchen, cooking appliance, machinery and power system in commercial spaces.  
Fire does not mean only flame. It represents:- Motivation,Confidence,decision making,digestion,electricity, technology.  
Modern Vastu considers electric equipment’s, investors as a part of fire element.

Think of a gas stove:-  
Too little flame— food remains uncooked.  
Too much flame— food burns.  
Balanced flame- food cooks perfectly.

The goal of Vastu is not to” more fire”— it’s balanced fire.  
Southeast is associated with heat( digestion), transformation ( like raw food to cooked food) and action.

Smita( Kostubh Vastu)  
“ I don’t change spaces, I activate them.”

Why Southeast direction is called fire zone? What is its significance?