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Antonov An-225 tail view, no APU Airbus A380 tail view with APU

Most APUs are installed in the rear, see the above image of an Airbus A380 as an example. On the An-225, no APU exhaust is visible at the rear of the aircraft.

So does the An-225 have an APU, and if yes, where is it located?

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No. It doesn't have an APU — it has two of them.

They are located close to the main landing gears. From An-225 Mriya is the world’s largest aircraft (English version):

Auxiliary power plant consisting of two TA-12 turbofans installed in the left and right chassis fairings provides independent power to all systems and starts the engines.

I think "turbofans" is not the proper term here. Actually the TA-12 is (just) a gas turbine (Wiki (Russian), Google translation).

The location of the APUs being much closer to the tarmac might be a reason why Copenhagen airport has (or had) special regulations for its operation on an An-225 (source):

Special regulations for AN124 and AN225.
Aeroplane type AN124 and AN225 must not operate their APU unless the pavement underneath is protected against heat and blast effects from the exhaust.

I couldn't find a better picture but the exhaust pipe is quite visible here (red circle):

enter image description here (Source)

I'm not perfectly sure whether the green circle marks the intake, but I guess so.

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    $\begingroup$ The pictures are tremendously beautiful. Thank you for the information and all the pictures. $\endgroup$
    – AirCraft Lover
    Nov 10, 2019 at 14:09
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    $\begingroup$ @AirCraftLover You mean the pictures from the first link? Yes, indeed, they are awesome. To me, the An-225 is one of the most beautiful aircraft ever. Together with the Queen (B747) and the Concorde. $\endgroup$
    – PerlDuck
    Nov 10, 2019 at 14:12
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    $\begingroup$ Yes, the first link, containing various picture of the An-225. $\endgroup$
    – AirCraft Lover
    Nov 10, 2019 at 14:16
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    $\begingroup$ actually the picture above is not quite correct, i have seen a video of the AN225 on the taxiway and saw the door near the rear for the APU intake (in blue) and RED for the APU exhaust in this picture. $\endgroup$
    – Abe Coulter
    May 1 at 10:04

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