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Zilmet Hy Pro Potable Expansion Vessel For Water Heaters

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  • Estimated Delivery
  • FREE

2 to 3 Working DaysOrders placed before 1pm are processed the same day, delivery times are between 8am & 6pm Monday to Friday, all deliveries require a signature, for delivery instructions please use the notes section during checkout. Please see below for Items you will also require for this product.

✝ Subject to stock availability. UK Mainland only. Delivery fees and times to Northern Ireland, Scottish Highlands & Isles, Isle of Man, Isle of Wight, Isles of Scilly, and the Channel Isles may vary. Deliveries are made during working days only.

More Information
Brand Zilmet
Estimate Delivery Time 2 to 3 Working Days
Vessel Colour White

Zilmet Hy Pro expansion tanks are equipped with an interchangeable membrane to assure long life. The galvanised flange incorporates an interior polypropylene section making it more suitable for use with aggressive water. The tank has no corners in which sediment can be trapped.


The membrane guarantees that air and water do not mix, eliminating the possibility of waterlogging through loss of air to the system. In a hot water system, the increase in water volume, due to the increase in temperature, is absorbed by the expansion vessel. When the water temperature decreases, the pre-charge pressure of the vessel presses the air cushion and forces water back into the system. In a potable water system, when the pump starts, water enters the membrane using the whole capacity of the tank. When the pressure in the chamber reaches the maximum system pressure, the pump stops working. The tank is filled to maximum capacity. When water is needed again, the pressure in the air side will push water into the system. In both applications the system maintains the pressure, helping to reduce energy consumption.

Technical Features::

  • Expansion Vessel for water heaters and for any type of pump
  • Max. operating pressure: 10 bar
  • Max. operating temperature: 70°C
  • Factory pre-charge: 1.5-3 bar
  • Vessel Capacity: 2 Litre to 24 Litres
  • Shell: Carbon Steel
  • Flange: Galvanised Steel/Stainless Steel
  • Membrane: EPDM
  • Colour: White

Here at TradePlumbing.co.uk we have voluntarily extended our returns period to 90 days, as we understand that sometimes there may be the odd item left over from a project or you may have an unexpected delay to a project meaning that you need the added peace of mind when ordering products in case a return is necessary.

We truly believe in being able to offer customers a flexible service and this extended period allows us to go that little extra to help you when in need, as long as goods are returned in the same condition as received we are happy to help.

To return any time initially please email your request to our Customer Support team at customerservice@tradeplumbing.co.uk along with your TP - Order Reference, please allow at least 1 working day for response and we will take it from there.

To View our complete Return Policy Click on Return and Refunds