A romm 20x9 is 180 square feet. You will need 5000 to 6000 BTUs for this.
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It doesn't work that way. BTU is a unit of energy, not a unit of power. In other words, to heat a certain building you would need a certain amount of BTU per hour, a certain number of BTUs per second, or some other unit of power.
NO! Granite is hard S#$!. 1.If you don't have a diamond blade its not gonna do much. It doesn't matter how many blades or which way they turn. 2.You will need water to cool the blade and the tile. Without water to cool it the tile will get hot and break and the blade unless diamond will overheat turn to molten metal and fly apart .
You need 13 square meters.
how many roof tiles do I need for 6ft by 4 ft pitched
They need to eat 2 square yards.