Wacker Neuson’s HIF 690 and HIF 1200 flameless indirect-fired heaters use a diesel engine to generate heat, so the flame is completely isolated from the surrounding environment.

"Since the flame is isolated from the surrounding air by engine valves," said David Mencel, climate technology product manager of Wacker Neuson, "it will not ignite nearby combustible mixes. This makes these heaters ideal for potentially volatile applications such as oil and gas exploration, underground and aboveground mining, and restoration."

With Wacker Neuson flameless heater technology, cool ambient and/or recirculated air is drawn into the heater body and pulled through an exhaust heat exchanger and radiator, where it achieves significant heat gain. Air temperature increases further as it is drawn across the engine and heat plate. At the third and final heating stage, air is pushed through the shear plate oil heat exchanger, where it reaches its final temperature and is discharged through the outlet duct.

"The HIF 690 and HIF 1200 offer a maximum air output temperature of 250F with a maximum temperature rise of up to 150F," added Mencel.

Both heater models boast high CFM airflow and static pressure to optimize heat delivery in a rental-friendly, easy-to-use design. Featuring simple one-button operation, the HIF 690 and HIF 1200 also offer positive air and high temperature shutdowns. Automatic louvers help maintain desired operating temperatures, and a performance monitoring strobe light allows workers to see from a distance that all heating systems are operating properly. Maintenance of the heating system requires only a flush and refill of the high-performance mineral oil lubricating the shear plate and a filter change every 1,500 hours.

The Wacker Neuson HIF 690 flameless indirect fired heater is capable of heating up to 1 million cu. ft. (28,300 cu m) spaces with its maximum input of 686,000 Btu/hour (200 kW). The heater delivers up to 4,000 CFM airflow at a 3.5-in static pressure, and it can be equipped with the standard 20-in. (51 cm) air outlet or an optional dual 12-in. (30 cm) outlet. Air returns to the heater via a single 20-in. duct. Powered by a Cummins Tier IVi compliant diesel engine, the HIF 690 can operate more than 20 hours on a single tank of #2 diesel fuel when operating continuously at maximum capacity.

The Wacker Neuson HIF 1200 flameless heater will heat up to 1.7 million cu. ft. (48,000 cu m) spaces with its maximum 1.2 million Btu/hour (353 kW) heat input. The heater supplies air to structures through standard dual 20-in. diameter outlets or optional 4 by 12-in. outlets at a maximum airflow of 6,500 CFM at a 4.0-in static pressure. Return air is channeled back to the heater through a single 20-in. return air duct. The new HIF 1200 heater is powered by a John Deere diesel engine and offers more than 24 hours of continuous run time at full capacity with its 210-gal. (795 L) fuel tank.

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