240v solid state relay
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You will need a 240vac coiled relay, a small circuit breaker, a junction box to fit the circuit breaker and relay and some lighting cable rated to the legal requirements of your area.
You will need to connect a cable to one of the light fittings to pick up the active, neutral and earth. The cable needs to be 2 core and earth, usually 1.5mm CSA. You will need to run the cable to a small separate control box installed next to the control box for the heating elements. Inside the new box you will need to put the active into a small (0.5A) circuit breaker or fuse to protect the new relay. If the box is metal, attach the earth to it. Use the fused active and neutral to switch the 240VAC relay,Use the contacts of the interposing relay to switch your solid state relays.
Can I ask why you are looking at Solid State Relays?
These are used for fast switching of loads but you are switching 6kW once a day, I would think you are better off with a contactor, something like the Schneider Tesys K (844-9725)
@davecole I'll guess this is a kitchen with a bain marie where the workers leave and blow the elements. A lot of the cheaper commercial appliances use solid state relays for some reason.