The thermal storage can be compared to a battery which accumulates heat and gradually give it back.
Size estimate for 1gal firebox = 5 to 10gal of storage.
Application: UNI 15, Pellet Duo 25, EKO Duo 25
Volume: 135gal - 500L Weight: 415lbs Width: 26" Depth: 49¼" Height: 64" Steel Grade: ASTM A283 Max Pressure: 50 PSI Insulation: 4" Polyurethane Foam Made in Europe
A perfect designed heating system will match maximum heat output in the coldest day of the year. Meanwhile, boilers are almost always oversized and operate in partial load condition. In result, boilers rarely reach 100% capacity and are required to modulate down to a minimum of 30%. When boilers modulate down, they decrease proportionally from 90 to 70% efficiency.
Buffer tank allows the boiler to operate under any conditions at 100% capacity for maximum efficiency. They also serve as the center for all hydronic connections. Storage ease and optimize the operation of a modern hydronic system.