Heated build plate idea

I am looking into the feasibility of making a a 24"x24" or 24"x12" or 18" printer and what is stopping me is the idea of the heated build area/plate. I see all the discussions of amperage/wattage and I am uninformed in the ways of electricity. Is there a reason why people are not looking at electric cooking griddles with glass above it. For 110c you need about 230f. I am guessing it isnt safe to leave one of those running for more than an hour?

idea 2, and this is probably been asked before, what about 3 - 8" mk1/2 side by side for a 24x12 build area with a 1/4" aluminum or steel plate then glass over the top.

Thanx in advance
James

There are silicone heating mats made for 110/220V: [reprap.org] And expect your room to be heated significantly, too, along with a nice electricity bill.

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Generation 7 Electronics	Teacup Firmware	RepRap DIY

Electric griddle's work fine they are usually very good quality elements and any machine that is large is going to run long periods of time safety is one of the first concerns try not to use any thing flammable except for the plastic your printing. And a total fire resistant enclosure with automatic shutdown and alarm should be implemented