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Grzegorz Kruk
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Master AIR-BUS BV 691 S – indirect oil fired air heaters
Indirect fuel fired air heaters with separate Riello burner
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.
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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
225
kW
Heating power
768,000
Btu/h
Heating power
193,500
kcal/h
Air flow
12,800
m³/h
Fan
Axial
type
Air pressure
250
Pa
Thermostat control
Analogue or digital
Fuel consumption
21.44
l/h
Power supply
220-240/1ph/50
V/Hz
Electric power
2.8
kW
Rated current
12.6
A
Electronic box protection
IP55
Flue tube
200
Ømm
Air outlet diameter
4 x 320
1 x 720
mm
Product size (l x w x h)
2200 x 985 x 1620
mm
Box size (l x w x h)
2150 x 840 x 1560
mm
Net/gross weight
380/410
kg
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
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: 4240.684
Accessory for Master BV 691 heater
Product code: 4240.580
Accessory for BV 471, BV 691
Product code: 4515.510
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 471-691, Heylo K 120-160
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
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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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