effiQueenc Energy Storage Tank

effiQueenc Energy Storage Tank

The battery of your hydronic heating and cooling system

Sizes available:

300L (80 gal US) Model No.: EFFIRTSS-80
Five 1½″ FNPT connections, one on top and two on each side

450L (119 gal US) Model No.: EFFIRTSS-120
Five 2″ FNPT connections, one on top, and two on each side


effiQueenc energy storage tanks are made of 304 stainless steel, which is more resistant to corrosion and more durable than steel.

The effiQueenc energy storage tank is an all-in-one appliance: energy storage tank, hydraulic separator, and buffering tank. It is recommended to improve the performance of most heating and/or cooling water systems such as low thermal mass boilers, biomass boilers (wood, pellets, chips, Etc.), geothermal applications and air/water heat pumps, multi-zone systems with large thermal loads, and solar energy systems.

effiQueenc energy storage tanks are welded and handled by programmable tools (robots) in a completely automated process. Automated machines are also used to weld connections to ensure consistent quality across all effiQueenc energy storage tanks.

Benefits of effiQueenc energy storage tanks:

  • Minimizes the number of on/off cycles, reducing premature wear and tear on equipment and improving energy efficiency.
  • Hydronic heating systems coupled with an effiQueenc energy storage tank store energy like a battery does. When demand for heating or cooling is low (such as when there is little difference between indoor and outdoor temperatures) or when the effiQueenc energy storage tank is coupled with a low-power energy source, the energy required will first be drawn from the charge in the tank.
  • When you add an effiQueenc energy storage tank to a hydronic heating system, you can bleed air from the system, remove dirt, and optimize circulator performance for both the energy source and the distribution network.

Recommended to improve the performance of most hydronic heating systems:

  • Air-to-water heat pump
  • Geothermal heat pump
  • Biomass boiler (wood, pellets, chips, Etc.)
  • Solar energy system
  • System with multiple zones or a high thermal load


  • Made of 304 stainless steel
  • 50 mm (2″) HFC-free polyurethane insulation limits heat loss to ½°F per hour
  • Two preinstalled G1/2 immersion wells included
  • One ½″ connection for immersion well or temperature/pressure dial
  • One ¾″ FNPT drainage connection located at lowest point of tank (tap not included)
  • Tank has 4 adjustable legs
  • One ¾″ FNPT connection located at upper rear of unit, designed primarily for pressure valve (pressure valve not included)

Technical Data