Hot water issue - furnace ?

[Formula260SS]

Originally Posted by bigdog

I've been having hot water issues in both my showers, and thought it may be related to the mixing valve in the Delta handle.

I decided to pull in a plumber to diagnose the issue. Much to my surprise, he didn't believe the issue was related to the mixing valve, but related to the furnace !

He checked the furnace, and the hot water pipe coming out of the boiler,
which feeds the house with hot water, and it was only warm to the touch, and he said it should be so hot you shouldn't be able to touch for long.

His diagnosis, was the coil in the boiler was 'toast' ! Furnace is 30 yrs old.
Installation is basically removing 4-5 bolts on a plate, removing and replacing the coil, and reassemble. Didn't have performed at the time.

Does this sound like the 'coil' is the root cause ?
If so, how much time should it take for replacement ?

The Plumber is correct, mine does the same thing. I have to replace my coil every 2 years or so.