I am neither a plumber or a electrician but I can offer a couple of ideas. The 220 VAC outlet should be easily converted to one (possibly two) 120 VAC circuits (probably with very good amp/wattage ratings) by a qualified electrician and while that is being done I would ask that a GFI be added to the circuit(s) as well.
As for the plumbing I would keep the hot and cold faucets as they are (relocate if needed) and have a plumber install thermostatic mixer valve
which will mix the hot and cold water to a constant temperature and give you an additional "mixed water" faucet.
75 Gallon, 2X55W AH Supply CF 8800K, 1XMarineland Doublebright, 2X Marineland 350 Magnum; 45 Gallon Tall, 96Watt AH Supply CF 6700K; 30 Gallon Long; Fluval F&P 2.0 36"/46W; 20 Gallon, 1X26W AH Supply LED kit; all with Press. CO2; (Calcined) Montmorillonite Clay
Greater Seattle Aquarium Society (GSAS)
Last edited by Seattle_Aquarist; 09-29-2012 at 03:55 PM.
Reason: added info