I have no idea who is right.
What I do now is what we see as light does not heat up anything.
IR wave lengths heat up stuff this is the solar radiation we dont see but feel.
Stones brick water and so on absorb IR light.
Aluminum and gold will reflect it.
So you have two choices stack bricks behind the jug to absorb the IR readiation or put up aluminum to reflect it back into the room.
Also if you have it you have black plastic containers one of the ways you can keep them cool it to paint them with silver paint shade them or wrap foil around them.
A big sheet of aluminum behind a radiant heater works wonders reflecting heat back into a room instead of it going into the wall.
Worth
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