How do I automate the control of the CH circulation pump with two heat sources?

Welcome,

I need a concept on how to solve a problem with the control of the central heating circulation pump.
I have underfloor heating which has a circulation pump plugged into the hydraulic manifold to force the circulation of the liquid.
The central heating system has 2 independent heat sources (A and B) with their own controllers without mutual communication. Both heat sources are able to manage the said circulating pump in a simple way, by applying voltage to the terminals of the pump which turns it on (voltage 230V, current consumption max 50W).
The problem for me is that I have to switch this pump to separate sockets manually to run it if either heat source is running. The plumber suggested I add a second circulation pump, but for lack of space, cumbersome conversion and cost I would like to avoid this.

So I would need some kind of circuit, maybe a relay or a bistable relay, which would simply switch on the circulation pump when there is voltage from heat source A or B or AB at the same time.

You need two mains voltage coil relays
Each controller controls its own relay
You connect the NO contacts of the relays in parallel to the mains voltage on one side and to the pump on the other side

Feed the same phase from both power sources to the pump.

jurtur wrote:

Give both power sources the same phase feeding the pump.

You can't connect like this, there may be a back voltage, you should isolate the pump as specified by colleague anders11.

jurtur wrote:

Provide from both power sources the same phase feeding the pump.

It is probably impossible this way because....

marius3200 wrote:

and that I have to switch this pump to separate sockets manually

Here is a sample diagram I made

Thanks for the analysis and the diagram.
It remains for me to implement the solution.