IF on 120 ONLY and you get a small amount of hot water, your element is good. Just replace the 120 ECO/Tstat assbly. Another remote possibility, since your unit is old, there could be calcium deposits on the 120 element degrading the heat transfer. This is rare but does happen. This happens when you do not replace the Anode rod and flush the heater yearly. If the element has excess Calcium build up, and you have to pull the element to verify this, replace the element. If my unit, and it is close to 10 years old, I would replace the 120 element and the 120 Tstat/ECO switch. Doug
PS, I would also check and replace the black MANUAL 120 switch on the outside of the water heater. It is probably marginal from the years of use.
