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- The SFE IV is available in 4 sizes from 106 MBH to 247 MBH. It features a dependable cast iron heat exchanger with cast iron push nipples. The SFE IV also has a patented protective heat shield baffle which safeguards the casting above the water line. The unit is equipped with a Honeywell pressure control, boiler water level gauge glass, a steam pressure gauge and an electronic low water cutoff. The SFE IV features a compact footprint for application flexibility. The unit’s cast iron swing door and large flueways allow for easy cleaning and servicing. The SFE IV is backed by a 10 year limited warranty and is made in the USA.