Expansion vessels

[Beboers]

What is the difference between red and white expansion vessels? Just curious as to why the red cant be used on unvented cylinders?

 

[SimonG]

Reds non potable, white and blue are for potable water.

 

[Wet dream]

As the water comes into contact with steel and rusts. Contaminating the water

 

[gassafe]

I went to a unvented cylinder that had a white steel expansion vessel fitted once! It was a solar heating vessel, made from steel & was turning the water brown!!

 

[leethegasman]

The red ones are steel no protection on the inside of vessel used for heating only .the white or grey ones have a coating on the inside to prevent them from rusting.