Nexans TXLP 730 Watt Floor Heating Cable for 120v requires 6.1 amps
141 Ft Long to Heat floors of 51-65 Sq Ft (depends on spacing) Closer spacing means more heat and faster warm-up time. National Electric Code allows a MAXIMUM of 15 watts per Sq Ft for Indoor floors. So the lowest value Cannot be exceeded. A cable that covers 51-65 SF CANNOT be installed in a 37 Sq Foot area, as this would exceed the allowable Watts per Sq Ft (730 watts divided by 37 SF = 20 watts per SF)