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The Bobil Expansion tank complements the SureCal calorifier hot water system and provides a safer and smother water system. It comes pre-assembled and pressure set for easy installation.  Use 15mm push fit plastic plumbing fittings to install.

 

PLEASE NOTE - THIS IS NOT NEEDED WHEN USING IN CONJUNCTION WITH A BOBIL WATER HEATER. THE SILICONE HOSE IN THE BOBIL KIT ALLOWS FOR EXPANSION.

 

What is an expansion tank and why should I fit one?

 

An expansion tank is a safety device used in closed water heating systems such as a when a calorifier is used on a boat. It will absorb excess water pressure, which can be caused by thermal expansion as water is heated, or by water hammer

 

What size should I fit?

 

The expansion tank should measure 10% of the calorifier capacity. I.e. the 2 litre expansion tank would work with the 10 - 22 litre calorifier.

 

Where should I fit one?

 

It should be fitted after the thermostatic mixer valve on the calorifier but before the first outlet. It comes pre assembled with a connection ready to push straight into a plastic plumbing tee piece.

 

What does it come with?

 

You get the 2L tank, a bracket for mounting, a steel strap, a 15mm to 1/2" compression fitting and a 1/2” bsp to 10mm barbed fitting, four clips and a brass tee piece to attach to the hybrid kit (if you need