An accumulator tank is an important part of any pressure-controlled water system.  Fitted close to the pump discharge, it acts as a pressure buffer, absorbing flow from the pump when demand is low and smoothing the outlet pressure.  By removing the need for the pump to run immediately when an outlet is opened, it extends pump life and reduces battery drain.  The larger the accumulator tank, the less often the pump has to start.

The larger tanks have an appreciable water storage capacity (approximately half the nominal tank volume).  The larger your pressurised water system, or the higher the demand for water, the larger the accumulator tank should be. For minimum wear and tear on your pump, the largest practical accumulator tank is recommended.  Instructions for installation and operation, including (where appropriate) pressure adjustment, are supplied with each tank.

Accumulator tanks are also used as expansion vessels in conjunction with C-Warm water storage heaters