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Surejust 5 Liter Accumulator Tank

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5 Liter Accumulator tank for your RV or van

Please note - the outer shell is very soft, therefore you might see minor cosmetic defects, but they have no impact to the performance of the calorifier.

The water accumulator tank provides 5 liters of water before the water pump turns on. With its integrated diaphragm, the water accumulator tank absorbs any sudden pressure changes. Install it on the pressure side of the pump, and it will dampen water pressure spikes, reduce pump cycling, increase the pump's lifespan, and conserve battery power.

Surejust's 5 liter accumulator tank is robust and reliable due to its exemplary construction and high-quality materials. Installing it is quick and easy due to the fact that it has been pre-assembled and pre-pressurized at 19 PSI. It can be mounted in any position and is ready to connect to 15mm plastic plumbing.

The tank is preset at 19 PSI, which is enough for most systems. In general the required pressure setting for an expansion tank is 5 PSI above your pump pressure. If you do not know your pump pressure, set the expansion tank to 30 PSI.

Surejust accumulator tanks are supplied complete with a mounting bracket and plumbing fitting, ready to connect into your system.

SureCal is United Kingdom manufacturer for calorifiers (boilers/ water heaters) that are made out of the finest quality materials. Calorifiers are with BSP threads / connections.

Key Benefits:

  • It has a capacity of 5 liters.

  • Pressure spikes are cushioned by a built-in diaphragm.

  • Increases the lifespan of your water pump.

  • It reduces battery drain.

  • Reduces pump noise.

  • Ensures smoother water flow.

  • Provides greater control over water temperature.

Technical Specifications


5L (1.3 gal)


380 x 170 x 180 mm (15 x 6.7 x 7.1 in)


2.5kg (5.5 lbs)

Max Pressure (PSI)

112 PSI

Initial Pressure (PSI)

19 PSI