the width of the FW is only one consideration,wattage is also very important.for example the 3" FW comes in 6 & 10 watt per foot.both wattages will give you the temps you desire,but the 10 watt has the potential for harm in case of thermostat failure.
for most applications i use the 3" 6 watt in belly heat.i find this is safe and efficent,also the lower the wattage (that does the job) the less thermostats that i have to buy.
BTW i just read that there's a new FW product out,4" that's 5 watts per foot.have fun !
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