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Posted by HeatPro on December 11, 2007 at 20:20:42:
In Reply to: steam boiler sizing posted by steve on December 11, 2007 at 19:58:11:
: While I still am pondering the water conversion, I am at the moment leaning toward just replacing the steam boiler for the simplicity and cost savings now.
: 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?
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.
: What do I look for to be sure I am sized adequately without going to big and throwing money to the wind.
++ You look for the radiation requirement and add the piping and pickup allowance as you did above. Asking the same question 3 times comes to the answer eventually.
Can some oil boilers be more easily converted to gas later?
++ Some can, some can't; ask the boiler manufacturer.
Is a Riello burner the way to go in all cases?
++ Riello says so. The other burner manufacturers disagree.
: 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.
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