Specifications

Selection
This Quick Reference Selection Guide may be used as an alter-
native to using a formula to determine the correct expansion
tank for the system. This table is based upon a relief valve set-
ting of 150psi (10.3 bar),
and a maximum of 50°F temperature rise.
To select the correct model PLT series tank, simply go the
supply pressure equal to the system supply pressure (for pres-
sures between those shown use next highest supply pressure
shown), read across the chart to the correct tank as indicated
by the water heater capacity (for capacities between those
shown, use next highest capacity).
To accommodate the thermal expansion required for higher
temperature and/or higher pressure systems, multiple tanks
may be used. Please contact the factory for sizing information.
Materials
Diaphragm: Butyl rubber
Inlet Connection: Stainless Steel
Water
Meter
Watts
Shutoff
Watts
Backflow
Preventer
Watts
Pressure
Gauge
Watts PLT
Expansion
Tank
Watts
Service
Check
Valve
Watts
Vacuum
Relief
Valve
Hot Water to
dishwasher
and washing
machine
Watts
Tempering
Valves
Tempered Water
Watts
Seismic
Straps
Watts
Water
Heater
Stand
Watts T&P
Relief Valve
Watts
Drain Tube
Watts
Water
Pressure
Reducing
Valve
Cold
Technical Information
Description PLT-5 PLT-12 PLT-20 PLT-35
Max. Pressure - PSI 150 150 150 150
Max. Temp. - °F 200 200 200 200
Tank Volume - Gal. 2.1 4.5 8.5 14.00
Tank Acceptance - Gal. 1.26 2.8 3.2 5.6
Air Pre-charge - PSI 20 20 20 20
Connections Size - Inches
3
⁄4 Male
3
⁄4 Male
3
⁄4 Male 1 Female
Diameter - Inches 8 10.5 12.5 16.0
Length - Inches 11 13.5 19.2 21.7
Weight - Lbs. 5.5 10 15 32
Acceptance Volume
Air Side Water Side Volume
Pre-pressure at 150psi (gallons)
(psi) PLT-5 PLT-12 PLT-20 PLT-35
20 1.48 3.42 7.102 10.69
40 1.26 2.88 5.882 9.17
60 1.0 2.49 4.705 7.59
80 .8 1.85 4.009 6.07
SUPPLY
PRESSURE
(PSIG)
WATER HEATER (GALLONS)
20 30 40 50 80 100 120
40
50
55
60
70
80
90
100
110
120
PLT-5 PLT-20
PLT-12 PLT-35
Multiple tanks required - consult factory
ES-PLT 0945 © 2009 Watts
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
A Watts Water Technologies Company
Spec Seq#: 42
PLT5