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Re: steam boiler sizing

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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?
++ Yes

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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