Gas Pressure

Paul_44

I want to reduce the BTU output of my Buderus G124 boiler by reducing the gas pressure to achieve a 10 % reduction in BTU output. What are the consequences of doing this?

jeff_51

won't work

gas pressure must be within the limits of the gas valve. Reducing pressure won't save you anything, except the boiler prolly won't work and then you will save alot on your fuel bills. The modulating burner doesn't cut gas pressure, but gas volume. Insulation is the most cost effective way to reduce gas bills, then turning down the temp. Give us some more info about the system and we will see if there are other good ideas out there on how to save you fuel

will smith_4

I've seen boilers derated by downfiring through dropping gas pressure and by plugging end of manifold burners-always because they were oversized to begin with. You need to know what the gas valve manufacturer says about minimum allowable outlet pressure, but remember-if you take this route, the manufacturer is off the hook for anything that happens. Re-Engineering happens all the time, and sometimes it works. Sometimes it don't. Too many lawyers to gamble.

David Hohengasser

Volume of gas

So the gas valve always lets the same volume of gas pass through when open, only the pressure can change with adjustment?

bigugh_4

The gas valve is pressure conscious

That is it has to operate within the limits of its condtruction. You can reduce the input of a gas device by re-orificeing the burner input orifices. Inserting orifices with samller (correct) openings. These must be carefully drilled in present day burners to conform to the burners standards. we should use only factory drilled orifices. The gas pressure should remain the same as the device is enginerred for.