These cannot see through walls of any kind. The example used is from the manufacturer's website and it most likely refers to the ability to sense body heat down a hallway.
The heat seekers sense differences in temperature. The greater the difference, the more likely it is that the heat seeker will find it. A person wearing heavily insulated clothing may not be picked up, or a person wearing normal clothing on a 95 degree summer day. It will, hopefully, be able to sense a bonfire that has been lit in the middle of a frozen lake.
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Gives you some idea.
As Ryan says you do not see through anything solid (OK except chunks of Germanium... <g>) , what you can see with an imager are surface temperature differences and so might detect them with a seeker. What sort of detection level can these seekers do anyway ?