Difference between fire tube boiler and water tube boiler

Water Tube Boiler	Fire tube Boiler
i) The water circulates inside the tubes which are surrounded by the hot flue gases from the furnace.	i) The hot gases from furnace passes through the tubes which are surrounded by water.
ii) Externally fired	ii) Generally Internally fired
iii) It generates steam at a higher pressure up to 165 bar.	iii) It can generate steam only up to 24.5 bar.
iv) The rate of generation of steam is high, up to 450 tons/hrs	iv) The rate of generation of steam is low, up to 9 tons/hrs
v) Its overall efficiency 90%	v) Its overall efficiency is only 75%
vi) Its operating cost is high	vi) Its operating cost is less
vii) The bursting chance of water tube boiler is more	vii) The bursting chance of fire tube boiler is less
viii) It is used for large power plant	viii) It is not suitable for large power plants
ix) It occupies less floor space for a given power	ix) It occupies more floor space for a given power
x) Its construction is simple	x) Its construction is difficult
xi) Its transportation is simple	xi) Its transportation is difficult
xii) Water treatment is necessary	xii) Water treatment not necessary
xiii) Examples: Babcock and Wilcox boiler Stirling boiler La-Mont boiler Benson boiler Loeffler boiler Yarrow boiler	xiii) Examples: Simple vertical boiler Cochran boiler Lancashire boiler Cornish boiler Scotch boiler Locomotive boiler Velcon boiler