To provide an apparatus and a system capable of warming an object while utilizing heat acoustic effects.

A first stack 3a held between a high temperature side heat exchanger 4 and a low temperature input side heat exchanger 5 is installed in a first tube part 2a, a second stack 3b held by a low temperature side heat exchanger 6 and a high temperature output side heat exchanger 7 is installed in a second tube part 2b, and the low temperature input side heat exchanger 5 is cooled to -20 to -60°C to generate standing waves and traveling waves by excitation in the first tube part 3a. Then, a temperature gradient is produced in the second stack 3b by propagating the standing waves and the traveling waves to the second tube part 2b, and a high heat is outputted, by the temperature gradient, from the high temperature output side heat exchanger 7 installed on the second stack 3b side.