Products
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.
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
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 calculator - Master
Use our calculator to get recommendations for the size of air flow heater you need for your room.
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Master Climate Solutions app
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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: 4240.580
Accessory for BV 471, BV 691
Product code: 4031.460
Accessory for BV 471, BV 691, BV 500, BV 400
Product code: 4515.532
Accessory for B 230, B 360, BV 110, BV 170, BV 290, BV 471, BV 691, BV 400
Product code: 4013.245
Accessory for BV 471, BV 691
Product code: 4013.250
Accessory for BV 471, BV 691
Product code: 4013.248
Accessory for BV 471, BV 691
Product code: 4515.570
Accessory for BV 290, BV 400, BV 691
Product code: 4515.558
Accessory for BV 110, BV 170, BV 691
Product code: 4515.552
Accessory for BV 691, RS 40
Product code: 4515.367
Accessory for BV 110, BV 170, BV 691
Product code: 4515.366
Accessory for BV 691, RS 40
Product code: 4515.365
Accessory for BV 691
Useful downloads
Master catalogue
Master AIR-BUS fuel tank manual
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Indirect air flow heaters AIR-BUS have a wide heat exchanger in stainless steel pipes, separate Riello burner and air recycling kit.
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Indirect fuel fired air heaters with separate Riello burner
Indirect air flow heaters AIR-BUS have a wide heat exchanger in stainless steel pipes, separate Riello burner and air recycling kit.
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