Question: what is mbh in boiler rating?
Answer: BTU = British Thermal Units: that quantity of heat required to raise one (1) lb. of water one (1) degree on the Fahrenheit scale. MBH = 1,000 BTU/hr. PPH = Pounds of steam per hour. Gross Rating – The full output of a boiler actually available to the heating or process system at the outlet nozzle.