Hi -

I am running some NM wire through a wall that also houses a hot water heat (baseboard radiator). Is there concern for how close the wire can be to or touching the pipe?

I would not allow the non-metalic bcable to touch the radiator but a baseboard unit will not get so hot that it can melt the insulation just by being near it. Yopur local buildong codes or building inspector may have more specific advice.