Silicone heated bed

Dear fellow forummers,

I am a nubie in the 3D printing world. However, I am tasked to do a school project on 3D printing.
The project is totally diy. We use arduino mega 2560 & ramps 1.4 & repetier.
Recently bought a silicone heater rated at 12V & 200W.
Change the necessary in Marlin. However, found that the bed did not go up the specified temperature, which is 110d C
Is this due to maybe we need to get an SSR connected?
If so, do we purchase ac-dc ssr or dc-dc ssr?
What ratings of ssr is preferable?
Can anyone kind enough to show the schematic on how it should be wired?

Thanks

There isn't enough power, how big is the heater? What PSU are you using?

On the Ramps board the STP55NF06L. - MOSFET is rated to 60V, 55A. it comes in a TO-220 case. However you are running in the order of 16.6 amps through it and it will get very hot. Get a heat sink to fit on the TO-220 case and maybe a small fan for it as well. This is what I have done, after burning out one MOSFET

As has been said, check the capacity of your PSU.

Thanks guys for your input.
Manage to get the bed heating up