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Master AIR-BUS BV 691 S – indirect oil fired air heaters
AIR-BUS indirect air flow heaters have a wide heat exchanger in stainless steel pipes and a separate Riello burner. They offer high efficiency and the possibility of connecting up to four flex tubes per unit.
View all of our indirect fuel fired heaters or search for an indirect oil fired heater, tent heater or other type of commercial heater to meet your required applications.
Key features
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Strong and robust steel frame with metric bolts
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Powerful fan
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Air pressure 250 Pa (400 Pa for centrifugal version)
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Digital control of the combustion
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Unique 'cold start' button for very cold environments
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Possible connection to 4, 2 or 1 flexible tubes
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Flue gas exhaust
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Separate Riello oil burner
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Summer/Winter switch for ventilation only
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Electronic flame control with photocell
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Fan-Limit thermostat with automatic reset
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Limit thermostat with manual reset
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Fuel preheater
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Two oil filters: oil pump filter and suction filter
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Quick connector to external tank (optional)
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High-efficiency heat exchanger made of stainless steel pipes
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Stainless steel combustion chamber
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Robust wheels included
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4 robust crane hooks
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These heaters can burn: biofuel HVO 100, diesel or kerosene
Product specifications
Heating power
Heating power
Heating power
Air flow
Fan
Air pressure
Thermostat control
Fuel consumption
Power supply
Electric power
Rated current
Electronic box protection
Flue tube
Air outlet diameter
Product size (l x w x h)
Box size (l x w x h)
Net/gross weight
Our tools
Air flow heater recommendation tool
Use our calculator to get recommendations for the size of air flow heater you need for your room.
Master 3-year limited warranty
Register your Master product here to take advantage of the benefits of the 3-year limited warranty.
Master Climate Solutions app
Use the Master Climate solutions app to calculate power and get recommended heating, cooling, drying or ventilation products for your work area.
Accessories and consumables
Useful downloads
Related products
Featured insights
Ensure that construction heaters are applied effectively and safely by following this helpful guide.
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