boiler rating

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    Calculating btu's- how does this pertain to boiler ratings.

    My understanding is that it takes 8.33 btus to raise 1 gal of water 1 degree f. If so, an 1800 gallon tank needs (at least) 8.33 x 1800 = 15,000 btu's? If the mfg. states 1 firing will raise the water temp approx. 30 degrees (with no load)...then 1 firing is 450,000 btu's. This unit is rated...
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