Products
AIR-BUS BV 471-691
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.
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
Product specifications
Heating power
Heating power
Heating power
Air flow
Fan type
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
Suitable for:
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.
Accessories and consumables
Product code: 4150.109
Accessory for direct oil, indirect oil, AIR-BUS, BLP ET, B 18, B 30, RS 40, XL 9, XL 61, XL 91, DC 61, CF 75
Product code: 4150.112
Accessory for direct oil, indirect oil, AIR-BUS, BLP ET, B 18, B 30, RS 40, XL 9, XL 61, XL 91, DC 61, CF 75
Product code: 4150.133
Accessory for direct oil, indirect oil, AIR-BUS, BLP ET, B 18, B 30, RS 40, XL 9, XL 61, XL 91, DC 61, CF 75
Product code: 4150.134
Accessory for direct oil, indirect oil, AIR-BUS, BLP ET, B 18, B 30, RS 40, XL 9, XL 61, XL 91, DC 61, CF 75
Product code: 4515.932
Accessory for B 230, B 360, BV 110, BV 170, BV 290, BV 471, BV 691, BV 500, BV 400
Product code: 4013.248
Accessory for BV 471, BV 691
Useful downloads
Master catalogue
Master AIR-BUS fuel tank manual
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Featured insights
How indirect heating helped create a healthy and comfortable indoor climate
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