Geothermal expansion tanks are primarily intended to limit the pressure loss in a closed-loop geothermal system due to the expansion of the HDPE pipe in the ground loop. You can learn more about expansion tanks in geothermal systems by viewing the IGSHPA Dig Deeper presentation “Expansion Tanks In Geothermal Systems” , reviewing the presentation, and by reading our white paper.
Geo-Flo manufactures the industry’s only HDPE expansion tank that can be thermally fused into the loop creating a maintenance free, leak-proof solution for low system pressure in residential geothermal systems (Submittal Sheet).
In addition to the small residential HDPE expansion tank, Geo-Flo offers larger expansion tanks (Submittal Sheet) for large residential and commercial sized ground loops, along with mounting kits and flexible connection hoses. Geo-Flo offers a free design calculator to help properly select the correct expansion tank size based on the loop size and construction.
The following table shows the standard sizes we offer.
| EXPANSION TANKS | |||
|---|---|---|---|
| PN | DESCRIPTION | CAPACITY (GAL) | CONNECT. SIZE |
| 3230 | Expansion Tank, HDPE, 3/4 GAL | .75 | 1-1/4" Socket Fusion |
| ETN-FX-HTX15 | Expansion Tank, NON-ASME, 2 GAL | 2.1 | 1/2" MPT |
| ETN-FX-HTX30 | Expansion Tank, NON-ASME, 5 GAL | 4.8 | |
| ETN-FX-HTX60 | Expansion Tank, NON-ASME, 6 GAL | 6 | |
| ETN-FX-HTX90 | Expansion Tank, NON-ASME, 15 GAL | 15 | 3/4" MPT |
| Mounting Kits for Expansion Tanks | ||
|---|---|---|
| PN | Description | Compatiable Expansion Tank |
| 4579 | Expansion Tank Mounting Kit | ETN-FX-HTX15 |
| 4680 | Expansion Tank Mounting Kit. 4.4-7.6G | ETN-FX-HTX30 |
| ETN-FX-HTX60 | ||
| Connection Hoses for Expansion Tanks | ||
| 4645 | Hose, 1/2" FIP X 1/2" FIP, 30" long, PVC core, Stainless Steel braid | ETN-FX-HTX15 |
| ETN-FX-HTX30 | ||
| ETN-FX-HTX60 | ||