Specification

Expansion Tanks
Boiler System Expansion Tanks
Water Worker
®
Boiler Expansion Tanks are compatible with closed-loop hydronic heating systems
using baseboards or radiators. A heavy duty diaphragm flexes against an air cushion to maintain a safe
operating pressure. This eliminates relief valve discharge and creates a quiet, longer lasting system.
Maximum working pressure: 100 psi.
Maximum operating temperature: 240° F.
Factory pre-charge: 12 psi.
Boiler System Expansion Tank
Model
Tank Volume
(Gallons)
UPC
(642031)
Ship
Weight
(lbs.)
Package Dimensions (Inches) Sys. Conn.
NPTF*
(Inches)
Length Width Height
HTEX-15 2.0 654595 8 8 8 13 1/2
HTEX-30 4.4 654601 9 11 11 16 1/2
*Carbon Steel System Connection.
Radiant Expansion Tanks
Water Worker Radiant Expansion Tanks are designed for modern, high efficiency in-floor heating
systems. The corrosion resistant stainless steel connection and plastic oxygen barrier are compatible
with antifreeze fluids and all tubing types to promote dependable, efficient system operation.
Plastic liner is compatible with barrier and non-barrier tubing.
Maximum working pressure: 100 psi.
Maximum operating temperature: 200° F.
Factory pre-charge: 12 psi.
Radiant Expansion Tank
Model
Tank Volume
(Gallons)
UPC
(642031)
Ship
Weight
(lbs.)
Package Dimensions (Inches) Sys. Conn.
NPTF*
(Inches)
Length Width Height
RE2R 2.0 631404 5 8 8 13 1/2
RE5R 4.4 631428 9 11 11 16 1/2
*Stainless Steel System Connection
Water Heater Boiler System Radiant
Water Heater
Size
Minimum
Tank Volume
Model
Boiler BTU
Rating
Minimum
Tank Volume
Model
Boiler BTU
Rating
Minimum
Tank Volume
Model
Up to 50 gallon
2.0 G-5 25,000 to 75,000 2.0 RE2R 25,000 to 75,000 2.0 HTEX-15
Up to 80 gallon 4.4 G-12 Up to 150,000 4.4 RE5R Up to 150,000 4.4 HTEX-30
Expansion Tank Sizing