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Need boiler sizing help

I could use some of your collective experience checking my boiler sizing calculations:



Cubic square feet 150,000 (csf x 6 on main, csf x 6 on 2nd, .5 of that in basement)

=150,000 btu output needed

X 1.15 (15%) make up for piping

X 1.15 (15%) pick up

=198,375

X 80% efficiency of boiler

=238,050 btu boiler size needed



Radiators:

Room height depth columns width sections

livings 20 8 5 81 33

livingn 20 8 5 50 21

dining 20 8 5 77 32

kitchen 32 8 5 35 15

master 20 8 5 68 28

bath 20 8 5 35 15

guest 20 8 5 63 26

nbed 20 8 5 68 28

sbed 20 8 5 50 21



Does 238K look correct?



Thanks

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