Hello,

Heptane has higher boiling point.

The boiling point of Heptane is 98 degree celsius. Heptane is straight chained hydrocarbon and has strong intermolecular force due to which it  has higher boiling points.

2-Methylhexane is an isomer of Heptane. It can't be 1-Methylhexane but should be 2-Methylhexane as mentioned by you in question. 1-Methylhexane  is Heptane only.

2-Methylhexane is an isomer and is also a branched hydrocarbon resulting in decrease of intermolecular force. So it has less boiling point than heptane.

Hope this was helpful