#15 Expansion Tank (2.1 Gal Volume)


Brand: Calefactio

Mfr Part#: HGT-15

Availability: In Stock
Usually ships: within 1 business day
Qty Price
$20.95 / each
x4 $79.80
(4 x $19.95 / each)
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Calefactio HGT-15 is a #15 bladder-type expansion tank designed for use in closed-loop hydronic and radiant heating systems. It is a direct replacement for Amtrol Extrol #15, B&G HFT-15 and Watts ETX-15 models.


  • Full acceptance bladder;
  • Compatible with conventional heating & radiant systems, glycol containing systems (up to 50/50 mix) and select solar applications;
  • No contact with steel shell means no corrosion;
  • Bladder design prevents waterlogging;
  • Direct replacement for #15 models from other manufacturers;
  • For non-potable water applications only.

Technical Specifications:

  • Factory pre-charge pressure: 12 psi;
  • System connection: 1/2" male threaded;
  • Max. operating temperature: 240°F;
  • Max. operating pressure: 115 psi;
  • Expansion tank volume: 2.1 gallons;
  • Height: 13.7";
  • Diameter: 7.9";
  • Weight: 5 lbs.


5-year manufacturer's warranty.
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