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    Ibaiondo expansion vessels

    Ibaiondo CMF expansion vessel without feet, red, with threaded bottom connection
    Ibaiondo CMF expansion vessel with feet, red, vertical model
    Ibaiondo CMF fixed-membrane expansion vessel for heating and cooling systems
    Ibaiondo
    from €31,71
    Ibaiondo CMR expansion vessel without feet, white, for domestic hot water
    Ibaiondo CMR expansion vessel for domestic hot water, drinking-water membrane
    Ibaiondo
    from €42,63
    Ibaiondo SMF fixed-membrane solar expansion vessel without feet, front view
    Ibaiondo solar range: SMF vessel without feet beside the SMR-P with feet and the vertical SMR
    Ibaiondo SMF fixed-membrane expansion vessel for solar thermal systems
    Ibaiondo
    from €34,53
    Ibaiondo SMR-P replaceable-membrane solar expansion vessel with feet, front view
    Ibaiondo 220 SMR vertical solar expansion vessel, 200 litres, with feet and top cover
    Ibaiondo SMR replaceable-membrane expansion vessel for solar thermal systems
    Ibaiondo
    from €149,85
    Ibaiondo AMR series pressure tank on legs, red, front view
    Ibaiondo 24 AMR-E, 24 litres, red, without legs
    Ibaiondo AMR pressure tank with replaceable membrane, 24 to 700 litres
    Ibaiondo
    from €36,65
    Ibaiondo AMR-PLUS vertical pressure tank, blue, on legs, front view
    Ibaiondo AMR-PLUS vertical tank with top cover and legs, second view on white
    Ibaiondo AMR-PLUS pressure tank with replaceable membrane for booster pump sets
    Ibaiondo
    from €596,43
    Ibaiondo replacement membrane for AMR pressure tank
    Ibaiondo replacement membrane for AMR-E and AMR-B160 pressure tanks
    Ibaiondo
    from €15,93
    Ibaiondo replacement membrane for AMR-PLUS pressure tank
    Ibaiondo replacement membrane for AMR-PLUS pressure tanks, 200 to 900 litres
    Ibaiondo
    from €343,04

    Ibaiondo expansion vessels and pressure tanks for heating, hot water, solar and booster pump sets

    An expansion vessel is a tank with a membrane that absorbs the increase in water volume as it heats up and keeps the circuit pressure stable. Here you will find the six Ibaiondo series we sell, made in Spain, and their replacement membranes, for anyone fitting, maintaining or replacing a vessel.

    All series are in stock at our warehouse.

    Models in this collection

    SeriesUseCapacitiesMaximum pressureMembrane
    Ibaiondo CMFClosed heating and cooling circuits8 to 500 litres4, 5 or 6 bar, depending on the modelFixed, not suitable for drinking water
    Ibaiondo CMRDomestic hot water5 to 80 litres10 bar; 8 bar for the 24-litre modelSuitable for drinking water; replaceable from 24 litres
    Ibaiondo SMFSolar thermal8 to 24 litres10 bar; 8 bar for the 24-litre modelFixed; withstands peaks of 130 °C for one hour
    Ibaiondo SMRSolar thermal35 to 200 litres10 barReplaceable; withstands peaks of 130 °C for one hour
    Ibaiondo AMRBooster pump sets24, 300, 500 and 700 litres8 or 10 bar, depending on the modelReplaceable, suitable for drinking water
    Ibaiondo AMR-PLUSBooster pump sets200, 300, 500 and 700 litres10 barReplaceable, suitable for drinking water
    Replacement membraneFor which pressure tankIbaiondo part numbers
    AMR-E and AMR-B160 membranes15, 20 and 24 AMR-E; 500 and 700 AMR-B16066700806 and 66700213
    AMR-PLUS membranes220, 350, 500, 700 and 900 AMR-PLUS66700203, 66700206 and 66700209

    Data according to Ibaiondo (2026 catalogue and data sheets).

    How to choose your Ibaiondo vessel

    1. The circuit decides the series: closed heating or cooling circuit, CMF; domestic hot water, CMR, for its membrane suitable for drinking water; solar thermal, SMF up to 24 litres and SMR from 35; booster pump set, AMR or AMR-PLUS.
    2. The capacity is calculated from the volume, temperatures and pressures of your system. Ibaiondo asks for that calculation to be done by authorised personnel and for the safety valve to be set below the maximum pressure of the vessel.
    3. Between the two pressure tanks, the AMR arrives with 1.5 bar of air and a 3-year manufacturer's warranty; the AMR-PLUS, with 3 bar of nitrogen and 5 years.

    Wall brackets are in Expansion vessel accessories and the other brands in Expansion vessels and pressure tanks.

    Applications

    • Replacing or sizing the vessel of a closed heating or cooling circuit.
    • Absorbing expansion next to the domestic hot water cylinder or in the solar circuit, with antifreeze up to 50% on the SMF and SMR.
    • Keeping a reserve of pressurised water next to the pump or booster set, so that it starts less often.

    Why buy your Ibaiondo vessel from Q-Tech?

    1. We build it into a pre-assembled plant room: assembled and tested in our workshop, it arrives at your site ready to connect (Expert Technician workshop pre-assembly service).
    2. If your system already exists, an on-site hourly Expert Technician connects the vessel and checks its air pressure.
    3. For selection questions there is the remote technical call with an Expert Technician, and for orders and availability, WhatsApp.

    Frequently asked questions

    Which Ibaiondo vessel do I need for heating?

    The CMF. It is the fixed-membrane series for closed heating and cooling circuits, from 8 to 500 litres.

    Can the CMF be used for domestic hot water?

    No. Its membrane is not suitable for drinking water. For domestic hot water Ibaiondo makes the CMR.

    Can the membrane be replaced?

    Yes on the SMR, the AMR, the AMR-PLUS and the CMR from 24 litres. On the CMF, the SMF and the CMR up to 18 litres the membrane is fixed.

    What is the delivery time?

    They are in stock at our warehouse. If no units are left when you order, we order them urgently and tell you the updated delivery time.

    Choose the series to suit your circuit and add the replacement membrane for your pressure tank to the order if you need it.

    Updated 11-11-2026 · v5.4