Commercial water heater output

**ferd** · 09-15-2011, 03:24 PM

If I have a 400,000 btu boiler heating water into a 370 gallon tank and I change the tank out to a 120 gallon tank, how much capacity do I loose? Assuming 95% eff boiler.

**jadnashua** · 09-15-2011, 04:54 PM

What's your usage rate and temperature? Incoming water temp?

**ferd** · 09-15-2011, 05:42 PM

output 130 deg incoming can be down to 40 boiler should put out 500 gph Just wondering what differance the tank will make.

**jimbo** · 09-15-2011, 07:16 PM

Originally Posted by ferd

If I have a 400,000 btu boiler heating water into a 370 gallon tank and I change the tank out to a 120 gallon tank, how much capacity do I loose? Assuming 95% eff boiler.

Round numbers, the boiler heats produces 400 gallons per hour. FIRST hour delivery is the recovery rate ( 400 gallons per hour ) PLUS 70% ot tank. SO your first hour availablilty drops from 660 gallons to 485 gallons. After the first hour, it is all recovery, 400 gallons per hour.