... best warranties in the industry. This SZS Series Fuel and Gas Boiler is the beat choice for both industrial and commercial users ... : Baltur,Weishaupt Heat Rate: 92%-97% SZS Series Oil and Gas Boiler Features 1 with double drums and “D” type layout, compact ... SZS Series Oil and Gas Boiler Application Heavy Oil, Light Oil, Residual Oil, Natural Gas, City Gas, and Blast Furnace Gas can be used as ...