I have a few electric wall heaters in my bathroom and laundry room made by Intertherm. They may be 30 years old. When you turn the dial to high, it takes 10 minutes or more before it actually turns on. Is the thermostat working correctly? If not, is there a fix?

Update: fixed from Nutone to Intertherm. Also, they seem to shut off pretty quickly after they start up, and then they stay off.

  • Do these units have a fan? If so, it is probably waiting for the coils to heat up before the fan kicks in so it doesn't start blowing cold air
    – Steven
    Commented Mar 12, 2012 at 18:16

1 Answer 1


I think it is one of two things.

  1. The element is getting old and between the age and the moisture in the bathroom has taken the element close to end life.
  2. The heater is 240V and maybe the breaker needs reset or it has gone bad or there is a bad connection in the heater. I've seen wire connections fry pretty bad in some cases.

If it is the element and with today's technology, like camera phones and e-mail, you can probably work with Nutone to identify the heater, and Nutone pretty good about having parts like this on their shelve.

Just be careful with the element, because it could be very brittle. No hard bounces or dropping it or parts on it if you take it out.

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