C282 The Heating System

After looking at the drawings for a while, His Majesty immediately said: "The palace also needs some, no, every house, every palace needs these!"

Xiao Yun waved his hand and said, "This... is not necessary."

"Why?"

His Majesty was puzzled.

Xiao Yun smiled and said, "I prepared an iron stove for you. It is much better than these. This is made of mud. No matter how good the mud is