Specifications

For Water Heater and Hot Water Storage Tank Applications
ES-PLT
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Series PLT
Potable Water Expansion Tanks
Series PLT Potable Water Expansion Tanks are designed to
absorb the increased volume of water created by thermal
expansion and to maintain balanced pressure throughout the
potable water supply system.
Heated water expands, and in a domestic hot water system,
the system may be closed when the potable water system is
isolated from the public water supply by a one-way valve such
as pressure reducing valve, backflow preventer or check valve.
Provisions must be made for this expansion.
Series PLT expansion tanks absorb the increased volume of
water created when the hot water storage tank is heated and
keeps the system pressure below the relief setting of the T&P
relief valve.
It is a pre-pressurized steel tank with an expansion membrane
that prevents contact of the water with the air in the tank. This
prevents loss of air to the water and insures long and trouble-
free life for the system. These tanks may be used with all types
of Direct Fired Hot Water Heaters (gas, oil or electric) and hot
water storage tanks.
Features
• Rugged flexible butyl diaphragm
• Field adjustable pre-charge
• In-line and free standing models
• Can be used with most standard
hot water heaters and storage tanks
Models
PLT-5-M1 has
3
⁄4" male connection, tank volume 2.1 gal.
PLT-12-M1 has
3
⁄4" male connection, tank volume 4.5 gal.
PLT-20-M1 has
3
⁄4" male connection, tank volume 8.5 gal.
PLT-35-M1 has 1" female connection, tank volume 14.00 gal.
Specifications
The potable water expansion tank shall be of drawn steel con-
struction. It shall have a Butyl diaphragm separating the air
chamber from the water containing chamber. Inlet connector
shall be Stainless Steel. Materials of manufacture for the dia-
phragm shall be FDA approved.
The potable water expansion tank shall be a Watts Model PLT.
Note: The potable water expansion tank shall be installed in
the cold water service pipe line on the supply side of the water
heater (or water storage tank). A pressure relief valve sized
and installed in accordance with local codes must be incorpo-
rated in the system.
In those systems requiring a combined temperature and pres-
sure safety relief valve, the temperature and pressure relief
valve should be sized and installed in accordance with local
codes. Adequate drainage provisions should be provided
where water flow will cause damage.
PLT-20
PLT-12
PLT-5
PLT-35
Standards
Models PLT-5, PLT-12 and PLT-20
are Listed by IAPMO.
Certified to ANSI/NSF 61
Model PLT-35
Certified to ANSI/NSF 61
See chart on back
(73˚F/23˚C)
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
LEAD FREE
*
* The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (0.25%)
of lead by weight.
Spec Seq#: 42
PLT5