I did the same thing once. Ended up killing the entire tank, destroying the hardwood flooring it sat on, and killing the furnace in my home - in February - in Wisconsin! (air return duct was right behind the tank and water ran down the duct and into the furnace circuitry). All told, this was a $7,000 insurance payout (new floor, new furnace, water mitigation). All that from a 150GPD RO Unit running into a 24 gal cube. Needless to say, my taste for the hobby and my wife's willingness to let me start over was all gone. Took five years before I was allowed to rebuild.
I feel your pain!
I feel your pain!