6 to 100 HPFour Pass Vertical Tubeless Design > The Cyclone Hot Water Boilers provide for exceptionally high efficiencies, lower fuel costs,and extremely rugged con-struction. Other features include: > Compact space saving vertical design > Shock Proof, no tubes to loosen or burn out > Convenient access to Eye HighӔ burner > Solid State controls for trouble free operation > Factory assembled, fully automatic > Simple and inexpensive to install > Low water pressure drops > Standard design pressure of 30 PSI Optional to 160 PSI, 250F > This product is Listed byUNDERWRITERS LABORATORIES, INC.and Bears the Mark: U Ю L