Model CBT burns natural gas or propane fuel and achieves up to 84 percent fuel-to-steam efficiency and 4:1 turndown at full modulation. The tubeless boiler produces good dry-quality steam for both high and low pressure systems without a steam separator. The boiler is available in five sizes from 10 to 30 hp. Constructed of thick, pressure vessel steel that exceeds ASME code requirements, the boiler has a large steam space that enables the boiler to produce better steam quality throughout the available operating range, particularly at lower operating pressures. It is suited for applications such as humidification, sterilization, cleaning, food processing, industrial processes and heating.