Stack temperature

scott inM.E.

Make sure your meter reading is a true " T Nett" reading", flue temp minus ambient. Also when you turn your meter on, it normaly has a countdown auto calibrate time. This normally takes a half minute.

When your meter is counting down, keep the probe end away from parts of the boiler that are above ambient temp. It could be a reason these reading are high. Some meters do give a T nett and T flue reading.

I use a UEI C75 and Testo 325 and are with in 5 deg. of each other any time I put one against another to verify.

realolman

I just stuck a digital thermometer in the stack of my V74 boiler about 9" above the boiler while it ran for about 5 minutes.

It went up to 648 deg F.

Any thoughts or comments?

thanks

clammy

cleaning time

With a stack temp at that i would if the boiler is oil fired call for a cleaning and have the chimmey base check .Sounds like it's dirty with a stack at over 600 ,i would have the boiler clean and serviced and a eff test performed peace and good luck clammy

realolman

oil fired

It is oil fired

clammy

call for service

Call for service and get it clean make sure they check the combustion chamber and give the burner a good going over also check draft and the draft damper to ensure that it is set up correctly peace and good luck clammy

Timco

Good call....lack of draft.

realolman

just a temp probe

This is not a combustion analyzer or any thing like that.
it is just an industrial thermometer with a stainless steel probe.