ROTHENBERGER PURE H2O cartridges in sizes S, M and L

VDI 2035 Rothenberger

Filter
    ROTHENBERGER PURE H2O size L demineralisation cartridge, front view
    PURE H2O size S cartridge, side view with the resin window
    ROTHENBERGER PURE H2O demineralisation cartridge for VDI 2035 heating fill
    ROTHENBERGER
    Price on request

    ROTHENBERGER cartridges to fill heating systems with water to VDI 2035

    A demineralisation cartridge is a resin filter that removes lime and salts from fill water to protect boilers, heat pumps and solar circuits. Q-Tech brings together the ROTHENBERGER PURE H2O range here for installers and owners who fill or top up a closed circuit. For all models, ask for a quote.

    Models in the collection

    ProductVersionsCapacity at 1 °dHMaximum flow
    ROTHENBERGER PURE H2OSizes S, M and L and S set with wall station2,000, 4,000 or 7,000 litres5 or 10 litres per minute

    Data according to ROTHENBERGER.

    How to choose

    • Litres you need: divide the capacity at 1 °dH by your water hardness; at 14 °dH, S gives 140 litres, M 280 and L 500.
    • Flow: S fills at 5 litres per minute; M and L at 10.
    • Mounting: the S set includes a wall bracket and hose for a fixed filling point.
    • Other brand: compare ROTHENBERGER with magnetic in VDI 2035 water quality.

    Applications

    • Filling new heat pump or boiler installations.
    • Top-ups during annual maintenance.
    • Draining and refilling after a circuit refurbishment.

    Why choose Q-Tech?

    1. We integrate filling into the pre-assembled plant room, tested in our workshop.
    2. We fit the cartridge and carry out the first fill with an on-site Expert Technician.
    3. We explain the guideline in our article VDI 2035: water quality in heat pumps and heating systems.

    Frequently asked questions

    What is the price?

    Ask for a quote: message us on WhatsApp with the size and we will send it to you.

    How do I know the cartridge is exhausted?

    By its colour: the resin changes colour as it is used up, according to ROTHENBERGER.

    Ask for a quote to fill your heating system to VDI 2035.

    Updated 07-11-2026 · v5.4