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Posted by Steve Scott on December 18, 2006, 7:39 am
Err, it only condenses in low temp applications, Bubba. FWIW, Buderus
is the only manufacturer I know of that lists the AFUE for high temp
applications as well.
wrote:
>wrote:
>
>>The reason for the 140 return temp is to prevent damage to the boiler.
>>If that doesn't concern you lower away.
>>
>>Or rip out the WM and install a mod/con boiler. They're specifically
>>designed for low return temps. The Buderus GB142 will give you up to
>>98% when it's condensing.
>
>Nope! Only 98% when it is in a low temp application. In other words,
>around 75 to 80 degree outlet water temperature.
>"You gotz to read the fine print"
>Bubba
>>
>>
>>>Just had a new (replacement) Weil-McLain Gold GV series 4
>>>boiler installed. This unit heats fluid that is piped
>>>thru a basement floor.
>>>
>>>The old unit, that rusted out (15 years old), had a lower
>>>outlet temperature. That unit supplied fluid at about 120F
>>>into the floor. This new unit is up around 140F.
>>>
>>>I assume that the oulet temperature, at 140F, is related directly
>>>to the boiler inlet temperature; it's the same circuit. I'm guessing..
>>>I don't have a schematic. My desire to reduce this temperature is
>>>based on
>>>increasing the boiler efficiency.
>>>
>>>The user's manual says that the GCM
>>>(the units controller) mixes return water (cooled by the floor)
>>>and by-passed boiler output to maintain 140F temperature into the
>>>boiler sections, "to guard against
>>>condensation even if the return water is as low as 6oF".
>>>Fluid returned from the floor is around 60F.
>>>
>>>My questions are these.
>>>
>>>Can the boiler inlet temperature be adjusted?
>>>
>>>Would it be more efficient to lower the boiler inlet temperature?
>>>
>>>Would lowering the temperature to, say, 120 be a good idea?
>>>
>>>What is the reason to avoid condensation? Doesn't the condensate
>>>just flow into a drain?
--
Thank you for encouraging my behavior.
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