millivolt t-stat

ed m

came across one of these today old system have no clue what it is also they need to replace t-stat so i went to test wires to see if it was low volt,or line and got no reading at all,h/o took out boiler manual from sears 1970 says its a self generating millivolt t-stat, how do i go about replacement do they still sell those t-stat,any help would be appericated thanks
eddie

heatguy

millivolts

yes you can still find millivolt tstat a good powerpyle generator with good pilot should give you about 750 millivolts 3/4 of 1 volt reading johnstone supply has them grainger might too usually starts with ts part #

tim smith

Robertshaw makes one p/n 200-501

Also Honeywell vision pros for programmable are suppose to be ok with millivolts also.

adambuild

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We use the HONEYWELL VISIONPro 8000 on millivolt systems all the time. They're great!