Volumizer and buffer tank: what is the difference

Volumizers and buffer tanks add water volume to the system, but they do not always serve the same purpose.

Volumizer

Used mainly to increase total water volume and reduce frequent start-stops.

Buffer tank

Can provide both thermal inertia and hydraulic separation, depending on the connection.

Practical choice

If only minimum water volume is needed, a volumizer might be enough. If circuit decoupling is also required, a buffer or hydraulic separator is usually chosen.