bill nye

dave_91

I posted before seeing your answer I have a basic res. crown boiler. hate when you hit the post button and then relieze that made no sense.

dave_92

bill nye

does it damage a boiler when the water temp goes from 180 to 0 deg on a daily basis thanks....

Brad White_46

OK, I'll bite then....

Whenever water gets to zero degrees regardless of starting temperature yes it will damage the boiler but not on a daily basis.

Just the first and only day that happens.

Bill Nye_2

Dave?

I don't understand the question, why would it do that? Zero degrees would freeze and ruin any boiler, I don't understand what application would require that.

If you mean from 180° to room temperature? It depends on the boiler. Many, many boilers today are "cold start". Meaning they stand idle, or at room temperature until a demand for heat or hot water.


Older boilers with tankless coils and rubber gaskets will leak when the appliance cools to room temperature. So a boiler like that would be better to maintain a minimum temp. of about 130°F.

The new W/M , Burnham, Viessmann, Buderus, etc., you fill in the brand, are almost "all" cold start unless they have a tankless coil.

When the boiler is off you are saving energy, the heat is not going up the chimney. There are many applications and many situations so .... it depends.

Any home that requires the boiler to heat hot water on a regular basis will keep the boiler warm and dry enough to prevent condensation, rust, and the such.

Wish I coild be more specific, but I'm not sure what you need.

dave_91

billnye

sorry I was going by the gauge on the boiler meaning 180 being the highest set point and ?????????? being the water temp when the boiler hasent ran in a couple of hours I guess IM conserned with condensate due to the water droping below ???? 130deg????????? thanks.

Bill Nye_2

Condensation

Again it depends, but it won't condense unless it gets below room temperature.

In a small residential boiler the flame temperature will get above the dew point very quickly, so don't worry. If you had a HUGE antique boiler with lots of water it might condense a bit, but still don't worry. If it is that big and old, it is not worth worrying about.

Post , post trauma [after you hit the button] You should see a little red edit button above your post. You can fix yur speling erers, and edit your content if need be.

Constantin

I'd contact the manufacturer

... and get it from the horse's mouth. The condensation temperature depends on the fuel being burned, and some boilers do not like to be started "cold". My non-condensing boiler can tolerate internal/return water temperatures down to 50°F, most want their water temps to be kept above 140°F.

You also should look into the flue gas temperatures to ensure that you're not getting a lot of condensation inside the flue. It could rot the flue out. If possible, widen the ΔT between the time a non-condensing boiler kicks in and out to maximize the time between cycles and minimize short-cycling. The longer the burner fires, the hotter the flue and the boiler get, hopefully preventing flue gas condensation either in the boiler or the flue.

dave_91

bill nye

thanks for all the great info and thanks for the patience!!!!!