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Re: steam boiler sizing

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Posted by steve on December 11, 2007 at 20:53:37:

In Reply to: Re: steam boiler sizing posted by HeatPro on December 11, 2007 at 20:20:42:

: : I am getting varying sizes from different plumbers. I sized the house using EDR*240 for the radiators and used a new convector table to estimate the EDR of the steel convectors. I got 177,000 BTU/h. As I understand one then uses a piping factor of 1.33 or matched that 177 number to the boiler net rating. Is that correct?
: ++ Yes
++++ Is it better to go under or over when using the net value. You might be in between boiler sizes or just slightly higher than the smaller size. Can one safely say if it is close go down and let the extra 33% take care of it?

: How does the sq ft of steam factor in because some boilers make much more steam than others.
: ++From your question I see that you don't 'gel' the idea that the radiators and a .33 or so added is to handle the steam the radiation and pipes need. You get a boiler that supplies the btuh you computed.
++++ The sq ft of steam seems to differ quite a bit between manufacturers even for comparable BTU/h boilers. Why is this and more importantly what effect does it have? Is 0.33 for piping always enough? Is using new convertor tables such as those from rittling.com accurate enough for the old convectors? Their convector tables don't seem to convert to btu/h by using a straight EDR*240. And is 240 the best value to use or should one use an alternate value?

: : How does one factor in how am optional burner affects boiler performance?
: ++ One doesn't; the burner either supplies the btuh or it doesn't.
++++ If boiler performance is only boiler related why would the burner matter?

Are there any energy star rated gas steam boilers?

Thanks again.

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