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    ESBE valves for solar thermal

    ESBE VTS522 solar thermostatic valve with external G thread (ESBE series photo)
    ESBE VTS522 with R ¾ adapters and check valves
    ESBE VTS520 thermostatic mixing valve for solar domestic hot water
    ESBE
    from €358,38
    ESBE VTD322 thermostatic diverting valve with external G 1 thread (ESBE photo)
    Drawing with dimensions A, B, C, D and E of the ESBE VTD322 valve (ESBE data sheet)
    ESBE VTD300 thermostatic diverting valve for heating, DHW and solar
    ESBE
    €248,44
    ESBE VMC322 45 °C solar kit with G 1 thread, three-quarter view
    Front dimension drawing of the ESBE VMC322 solar kit
    ESBE VMC322 45 °C Solar Kit for Dual-Source Domestic Hot Water, G 1
    ESBE
    €548,28

    ESBE valves for solar thermal: safe hot water with no electricity

    A solar thermostatic valve is a valve that mixes or diverts water from a solar cylinder without electricity, to deliver it at a safe temperature and use the sun before the boiler. In this subcollection of ESBE valves we bring together the ESBE valves for solar domestic hot water (DHW), in stock in Málaga.

    Models in this collection

    ModelFunctionTemperatureConnectionKvs (m³ per hour)
    ESBE VTS520 mixing valveMixes solar DHWOutlet 45 to 65 °C; inlet water up to 110 °C continuouslyG 1, G 1¼ or R ¾ with adapters3.0 to 3.5
    ESBE VTD300 diverting valveSwitches outlet according to temperatureChange-over at 45, 50 or 60 °CG 13.6
    ESBE VMC322 solar kitDiverts and mixes in one bodyChange-over at 45 °C; outlet 35 to 60 °CG 11.5

    Data according to ESBE.

    How to choose the solar valve

    1. Limiting the temperature at the taps: the VTS520, which accepts water from the cylinder up to 110 °C. If the water stays below 95 °C, the thermostatic valves in ESBE mixing valves will do.
    2. Sending water one way or the other by temperature, without mixing: the VTD300, with the change-over point you need.
    3. Solar cylinder with a backup boiler: the VMC322 sends water to the boiler only below 45 °C and limits the outlet. Its maximum flow from the collector is 42 litres per minute, for small installations.

    Applications

    • DHW in homes with solar collectors and a cylinder.
    • Solar DHW with a gas or oil boiler as backup.
    • Systems with a biomass boiler and a backup boiler, according to ESBE (see also ESBE valves for biomass).

    Why rely on Q-Tech for your solar installation?

    1. We fit the valve with the cylinder and the boiler in the pre-assembled plant room, tested in our workshop before it reaches your site.
    2. With a technical call we choose the model with your installation data, and an on-site Expert Technician installs or checks it.
    3. All three models are in stock in Málaga, and we answer you on WhatsApp.

    Frequently asked questions

    Do they need electricity?

    No. All three work with thermostatic elements, according to ESBE.

    What is the difference between the VTS520 and a standard DHW mixing valve?

    The temperature it accepts. The VTS520 works with water up to 110 °C continuously and the VTA320 up to 95 °C, according to ESBE.

    Can the change-over point be changed?

    On the VTD300, yes, by replacing its thermostat with another ESBE one. On the VMC322 it is fixed at 45 °C.

    What is the delivery time?

    They are in stock in Málaga and we dispatch them as soon as we confirm your order.

    Choose the valve by the function you need and make the most of solar DHW with ESBE and Q-Tech.

    Updated 09-11-2026 · v5.4