A. O. Smith TW-12 User Manual

Expansion Tanks

Certified to

NSF/ANSI 61-G and 372

TW SERIES EXPANSION TANKS FOR
POTABLE WATER HEATING SYSTEMS

Many of today’s water systems utilize backflow prevention or
pressure reducing valves. This seals off the system and requires the
use of an expansion tank, or the relief valve can discharge on each
heating cycle.

TW expansion tanks eliminate wasting hot water by providing the
adequate expansion needed in these systems.

Available in 2 and 5 gallon models they can provide adequate
relief for residential tanks up to 120 gallon.

TWO PIECE DESIGN

ONE YEAR WARRANTY

150 PSI WORKING PRESSURE

200°F MAXIMUM TEMPERATURE

Model

Number

TW-5 150 2.1 1.03 3/4” 8-1/4 10-3/16 5

TW-12 150 4.4 2.19 3/4” 11 14-3/4 9

Max.
Working
Pressure

(PSIG)

Tank

Volume

(GAL)

Max.

Acceptance

Volume
(60 PSI)

Conn.

Size

(MPT)

Diameter

(IN)

Height

(IN)

TW-5

TW-12

Weight

(LBS)

Rev May 2014 AOSEB55105