Don't use Superior Plumbing - Huge mistake!
My water heater went out nine months ago, I hired Superior to replace the 'thermal coupler'. This morning the 'new' thermal coupler went out. I called Superior Plumbing who scheduled a tech to come out late afternoon. Upon arrival, I was informed that I needed another thermal coupler as the new one they had supplied failed, and that they do not service Whirlpool products any longer. I was told that I should call Whirlpool, order the part and then call them back when the new part came in, and immediately proceeded to hand me an invoice for their service call. I called another plumber and they came out within the hour to replace the thermal coupler. Superior only warranties their work and parts for 30 days. The normal life expectancy of a thermal coupler is 10-15 years. I am moving all of my business.