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[Scott7m]

Yes the temperature is actually 136 degrees, but we usually just say 140

But the moisture comes from inside the wood, it can't collect on steel hotter than 136, so it's carried out the stack...

[pwdiver]

I have had the 5036 since 2009 and use it to heat my hot water also, I have no thermostatic valve on my system mine has worked very well I do see moisture sometimes where the door latches and yes my boiler does dip down in temp some time's as low. as 85 degree's. It still keeps the house warm but once the water temp get below 125 I don't get much hot water. Just one other tidbit of info don't overload the boiler either, don't let any wood get beyond the lowest baffle in the back of the combustion chamber I did that the other night by accident I found sparks flying out of my chimney because there was nothing keeping  the heat from going out the stack along with the cinders. Not good if you have a lot of leaf's in the yard.