Some of the key factors that you have to consider when selecting the boiler for an application are floor space, available fuel, operating pressure, NOX emissions and clearances. These are some of the things that you need to pay attention to for you to successfully get the best out of your boiler. It is advisable to consider sizing the boiler for the gross load and not for the net load. Technically speaking, if the boilers are sized for the net load, there is a high tendency that the steam will condense as fast as it is being utilized and will never enhance its head of steam. Checking the combustion air amount available to the burner is also crucial. Basically, the burner should have enough amount of air to fire at significant performance. It is also important to use only fresh ai