Which type of boilers is preferred cost wise when the boilers are required to raise less than 30 tonnes of steam?

Which type of boilers is preferred cost wise when the boilers are requ

1.	Which type of boilers is preferred cost wise when the boilers are required to raise less than 30 tonnes of steam?
A.	Flued boiler
B.	Cornish boiler
C.	Butterley boiler
D.	Shell boiler
Answer» E.