Customer called in needing quotes to replace 40 gallon water heater. Water heater is from 1998 or 1999. Customer having consistent issues with hot water. Diagnosed to be gas control valve thermostat probe not reading temperature correctly. Water pressure at 75psi which is within code. Noticed while looking an entire plumbing system, flue is starting to rust out and has few spots where fittings are rusting out. Highly recommend to replace flue to prevent any carbon monoxide leaking out. Customer also enquired about water softener and recommended HALO products.