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/150 PSI-Max 220 VAC Std. Receive your SCR-2 Titan N-120 in no more than 1-3 days. Recommended Wire Gage 1 x #6 AWG. Saves up to 60% on your water heating costs. Titan n120 scr2 whole house tankless water heater, 11.8kw the on demand 4 gpm whole house water heater.