18 Litre Aquasystems ARB18 Potable Expansion Vessel 3 Bar with Integrated Bracket - XVES050055

Product Information

The installation was very simple, the engineer powered off the mains of the boiler and replaced the vessel and restarted the system and it was all good.

The instructions are quite difficult to read, the text us ridiculously small and also don't cover much. These replacement membranes are quick and easy to install and can be used with all Aquasystem replaceable membrane potable and heating expansion vessels. I would appreciate a second opinion as to whether this would be a suitable replacement for a sealed system.

THE MAIN PURPOSE OF THE VESSEL IS TO COMPENSATE FOR THE INCREASE IN VOLUME OF WATER DUE TO THE VARYING WATER TEMPERATURES IN THE SYSTEM, E. Expansion tanks are also known as expansion vessels and are used to protect closed water heating systems and domestic hot water systems from excessive pressure. Yep - standard reply for unvented - happy to pay a G3 plumber - want to be sure they don't fit the same kit and don't get overcharged. Initially I thought the image on the product listing has like an oem - non label and non branded product. When it arrived it had all the labels as on the already fitted [[ASIN:B01BGZQVY6 ARB18 Expansion Vessel (Baxi Megaflow system) ]].

The existing ARB18 Expansion Vessel (Baxi Megaflow system) was installed in 2003 and the registered engineer said the reason I have to keep topping up the system on a daily basis was due to the expansion vessel. The installer of the system was in last year to pump up the vessel and said it was unlikely to last much longer, however looking at Gas Safe the installers of that firm now have no unvented certs so hesitant to get them back in.Most purchases from business sellers are protected by the Consumer Contract Regulations 2013 which give you the right to cancel the purchase within 14 days after the day you receive the item. The 103 third parties who use cookies on this service do so for their purposes of displaying and measuring personalized ads, generating audience insights, and developing and improving products. THE AQUASYSTEMS ARB POTABLE EXPANSION VESSELS ARE MANUFACTURED TO COMPLY WITH UK WATER REGULATIONS AND ARE TESTED AND CERTIFIED BY WRAS. Read more about the condition New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is applicable).

When it arrived it had all the labels as on the already fitted ARB18 Expansion Vessel (Baxi Megaflow system) . An unvented cylinder is expected to be checked/serviced every year and that would usually include checking the EXV. The existing [[ASIN:B01BGZQVY6 ARB18 Expansion Vessel (Baxi Megaflow system) ]] was installed in 2003 and the registered engineer said the reason I have to keep topping up the system on a daily basis was due to the expansion vessel. Not just the static pressure but probably letting all the air out ( which can also contain water on the air side!Surely some have better membranes than others and installers prefer certain makes to others for reliability. I am sure that you check and top up your car tyres every few weeks so why do you not expect your EXV not to be checked for three years at a time.

Once this has been reached the membrane will be fully inflated and takes up the capacity of the vessel shell. Also when I purchased the description said "The vessels are supplied with a replaceable membrane" , I assumed this meant an extra/spare membrane for the service. As the process is going on, the membrane deflates until the pressure reaches its minimal threshold value.The expansion vessel allows for this extra space, as when water temperature increases the membrane inside the vessel inflates to allow the water to fill the vessel. Due to the pressure from the pressurised air surrounding the membrane, water will start to exit the vessel until the membrane is deflated. Reliance Valves Aquasystem Replacement Vessel Membranes are available from 2 to 5000 litre capacity, which allows the vessel to be serviced in situ and prevents any water contact with the steel shell to prevent internal corrosion.