LSC 50 Heater mfg??
The reason I do not replace is because the limit switches are relatively inexpensive and the unit is a very simple and basic thing to maintain. I have been successful with this strategy on two other units of different mfg.
I would even argue that it is fairly efficient compared to other alternatives (such as switching to a boiler or furnace with ductwork)....but then again, I am a rookie and listen carefully to comments on this site and adjust my views and actions regularly.