Hi everyone

I'm trying to model a air-to-water heat pump to be placed in the node pointed by the red arrow in the picture, to exploit the external air as much as possible to heat the water of the plant loop. The hot water boiler will work only as the heat pump backup.

Is there an element to be used for this plant loop? It should be a reversible chiller. Alternatively, what's the correct way to model this kind of system? Thank you in advance.