My current Baxi boiler system needed topping up on a daily basis so bought the ARB18 Expansion Vessel (Baxi Megaflow system) Package Content :1x ARB18 Expansion Vessel (Baxi Megaflow system) FittingsThe item arrvied sooner than expected, kudos to the seller.

To calculate the overall star rating and percentage breakdown by star, we don’t use a simple average. When water is heated it expands and as water is not compressible this increased volume will create a rise in pressure within the system.Once this has been reached the membrane will be fully inflated and takes up the capacity of the vessel shell. Finance is provided by PayPal Credit (a trading name of PayPal UK Ltd, Whittaker House, Whittaker Avenue, Richmond-Upon-Thames, Surrey, United Kingdom, TW9 1EH).

Surely some have better membranes than others and installers prefer certain makes to others for reliability. At this point the membrane is back to its initial dimensions, the pump starts again and a new cycle begins. The bracket setup for this one is well dodgy as if it breaks off the wall it will fall on the other pipes and I'll be in a whole lot of trouble! Not just the static pressure but probably letting all the air out ( which can also contain water on the air side!Once the system is working, the pressure of the pump lets the water filling in the bladder inside tank. Definitely recommed the seller and of course the [[ASIN:B01BGZQVY6 ARB18 Expansion Vessel (Baxi Megaflow system) ]] if you are looking for one. The main purpose of an expansion vessel is to compensate for the increase in volume of water due to the varying water temperatures in hot water or heating systems.