I have a square/rectangular hotplate – can I use Heat-On?

Yes, you can.

To secure Heat-On to square or rectangular hotplates, use RR61087 Heat-On Adapter Plate for Square Hotplates.

It has four sliding (adjustable) jaws that enable you to fit it onto your hotplate.  There is a circular protrusion on top that fits the recess in the bottom of Heat-On.  This means the Heat-On block is secure and there is good heat transfer between the hotplate and the Heat-On.

RR61087 is suitable for hotplates from 140 x 140 mm to 200 x 200 mm.