3-port valve with centre off position?

[sharpener]

To switch the feed to my rads between heat pump and thermal store I need a 22mm motorised 3-port valve. Ideally it would have a centre off position so I do not need a separate 2-port valve as well. Does anyone make such a thing?

[JohnMo]

Funny thing I just looking at ESBE website vrb140, actually a 4 port, takes a flow from two sources and can mix or isolate and take from one or the other.

 

Not sure how you would control

[sharpener]

Thanks. Not sure whether it is suitable, there are pix here and here which I don't really understand. Nor why it would be described as enabling the use of two heat sources. Seems expensive even before you add an actuator.

 

I may have found an alternative way of doing it now. Two people have replied to say the Vaillant HP de-energises the heating valves when it is calling for DHW, so actually the S-plan valve setup I already have should work fine even though Vaillant technical have advised against it.