American Express - NaszaSGH.pl Gs650ybrt 300 water heater parts. We have a two-year old State Select water heater (model# GS650YBRT), and for the past few months the pilot light goes out randomly. ...With all needed parts and labor, hiring a plumber to install a traditional gas water heater costs $300-$3,500 or more, depending on capacity (with 40 or 50 gallons the most common sizes); length of warranty.