There is no direct relation between volts and BTU.
18000 BTU means TON 1.5 ,12000 BTU means 1 TON
1hp = 2544 Btu
12000BTU is 4.7hp
12000
how many LRA in 37,000btu
Birtishthermal unit 12000 btu
650 sft multiplied by 26 which means 16900. I BTU =12000 Divide 16900/12000 = 1.4 ton
400hp is 1,017,773 Btu
33,475 btu's in a boiler horse power
12000 per hour
usually 20 btu's per square foot so......12000 btu's should do fine