Under Rug Heating?

[MyNescafe]

I made the mistake of having my largish open plan kitchen/diner fitted with ceramic floor tiles without considering under floor heating before hand.
They are cold, even when the weather is warm(ish!)

I would really love to rip the lot up and have proper under floor heating but I just can't justify the cost or upheaval.

I've seen these heat mats that can be used under rugs that look a bit like an electric blanket (RugBuddy is one type). Has anyone any experience of these? Just wondering if they cost a fortune to run and how much heat they really provide?

Appreciate that I can't cover the entire floor with rugs but maybe one or two might help?

[PigletJohn]

heating by electricity costs about three times as much as heating by gas.

To warm your largish room might need 3 or 4 kW of energy.

I doubt a rug mat has more than 300W. I can imagine it might warm your feet while you sit in front of the TV, or make your cat happy. I don't believe you will notice any difference in the room.

Some people might fall over the flex.

[MyNescafe]

Think I may just stick with the fluffy slippers and a disappointed cat then!
Thanks PigletJohn