Boiler size

347

Hello All,
Happy late Thanksgiving.
I have a quick question.
Sizing a steam boiler replacement, I came up with 394.5 square feet of EDR. This does not include a missing radiator missing from one room (homeowner said he will not install one, but knows about the future) and the kitchen that has radiant heat. The radiant heat has a external coil that will need to be reconnected the new boiler (gas).
I would like to install a Peerless 63 series but the net rating are either 383 SF or 458 SF.
Which one would be the best fit. I'm thinking a little smaller would be better.
Thanks

Fred

The 383 should work fine, given the boiler has a 30% additional pick-up factor built in that is not included in the SQ. Ft. of Steam on the rating plate.

347

I have a second question also. I just looked through the installation manual and Peerless recommends the use of one riser off the boiler (which come with two taps), I'd like to use both, does anyone see a problem with this?

Fred

It is always good to use both riser taps. The installation manuals provide the "Minimum" acceptable installation guidelines. We almost always suggest using both tappings unless it is a very small boiler, then it's a bit of an over kill. A Drop header is always a great idea also.

347

Going to do a drop header. Just trying to figure out if I should keep it 3" or come 3" out both taps and reduce to 2" with 3"x 2" 90's and pipe the rest with 2" .

Fred

If the boiler tappings are 3", Do it all with 3", risers and header.

347

That,s what I was thinking. What do you think about the size?

Fred

Best not to reduce Riser tappings out of the boiler and a 3" header should work great.

347

Thanks