You can try researching thermoelectric chiller. As there is no refrigerant, you can flip side ways. There is one from gemsurfs.
Dimension L14.0xB30.0xH21.5
Good for 16gal or 70L.
May fit under ur TV console just nice with 5mm spare.. Haha..
Or there's ice probe thermoelectric chiller. You can put it in ur sump. But need to drill a hold to put the probe in.
Never tried thermoelectric before, not sure of their performance.