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Automatic series/parallel configuration

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Jr.Maxwell:
Hi Guys :),
I've been thinking about this issue for a while now and came here for your guided assistance haha.

Situation:
Ik have 6 heater mats spec'd at 12 volt. I need to power them with either a 12 or 24 volt battery. When powering them with a 12 volt battery I  simply put all the heater mats in parallel.
 (see image: "knipsel1")

When powering the heater mats with a 24 volt battery I configure it as 2x 3 mats in parallel. (see image: "knipsel2")

The problem rises when I've physically placed the heater mats. I  cannot change the placement nor connections of the heater mats on the PCB after physically placing them. However the input voltage can and will continuously change and be EITHER 12 or 24 volt.

Question: How can I wire the heater mats so that it works with 12 and 24 batteries? Is there a way to automatically make the switch? maybe an IC?

I came with this solution but I feel asif there are way smarter solutions: in this solution the cpu turns on/off mosfet's to create parallel and series configurations. (see image: "knipsel3")

As always,
Thanks amazing community!

Stray Electron:
  Are you saying that the supply voltage will be either 12 v or 24v or that it can vary between the two voltages?

   It looks like your heaters are only spec'd for 2.5W each or a total of only 15 watts so that's not a lot of power. Can't you just regulate the power to a constant 12 volts and feed that to the heaters?

Jr.Maxwell:
I mean that the input voltage will either be 12 or 24, nothingin between. Thanks for the head's up, I've clarified it in the main post.
I can use a 12 volt regulator, but that's my plan B. I'm looking to see if there's a way to solve this puzzle without a regulator (just to create more insight for myself). :)

greenpossum:
Can you consider a good old fashioned relay?

Nusa:
Take knipsel2 and draw a center rail (let's call that B) connecting the midpoints of each resistor pair. Now disconnect the top rail (let's call that A) from V+. Configure a 2-pole break-before-make relay that connects Ground , V+, A and B in two different configurations. When not energized, it's in 24V configuration, connecting V+ to A and nothing to B. When energized, it's in 12V configuration, connecting V+ to B and Ground to A. I'll leave the rest of the details to you.

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