"TURTLE" wrote in message
...

Any of the White Rogers 80 series will click because of a mechnical relay
to
turn it on with. i don't know about the Honeywell RTH 8500 but check with
the
person you buy it from and see that it is a electronic controls and not
mechnical relay type. Any person that sells them should know what they are
selling and tell you the difference. Get a electronicly controlled and not
a
Mechnical type control.

TURTLE

I did not know and didn't ask so typically they did not voluntarily point
out the difference. In any event thanks for the info.