Expansion Tanks

Expansion tanks located on the load side of a geothermal water-to-water heat pump, air-to-water heat pump, or on a boiler system, are intended to prevent over pressurization of the system as the water temperature rises.  These expansion tanks have the opposite purpose of a geothermal expansion tank on the source side (ground loop side) of a geothermal system.  

The following table shows the standard sizes we offer.

Expansion Tanks

PNDescriptionCapacity (GAL)Connect. SizePhoto
ETN-FX-HTX15Expansion Tank, NON-ASME, 2.1 GAL2.11/2"EXPANSION TANK, NON-ASME, 2.1 GAL
ETN-FX-HTX30Expansion Tank, NON-ASME, 4.8 GAL4.81/2"EXPANSION TANK, NON-ASME, 4.8 GAL
ETN-FX-HTX60Expansion Tank, NON-ASME, 6 GAL61/2"EXPANSION TANK, NON-ASME, 6 GAL
ETN-FX-HTX90Expansion Tank, NON-ASME, 15 GAL153/4"EXPANSION TANK, NON-ASME, 15 GAL

Mounting Kit and Hose Table

PNDescriptionCompatiable Expansion TankPhoto
4579Expansion Tank Mounting KitETN-FX-HTX15EXPANSION TANK MOUNTING KIT
4680Expansion Tank Mounting Kit. 4.4-7.6GETN-FX-HTX30EXPANSION TANK MOUNTING KIT, 4.4-7.6 G
ETN-FX-HTX60
Connection Hose for Expansion Tanks
4645Hose, 1/2" FIP X 1/2" FIP, 30" long, PVC core,
Stainless Steel braid
ETN-FX-HTX15HOSE, 1/2" FIP X 1/2" FIP, 30" LONG, PVC CORE, SS BRAID
ETN-FX-HTX30
ETN-FX-HTX60