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TWI 35-130
TWI 45-190
Data subject to change INT/1108/TWI/02
Terms and conditions apply, please refer to our website.
TWI 35-130
TWI 45-190
A Twister water heater should be installed according category
B23, C13, C33, C43 or C53*.
C43
B23 C33
C13 C53
Flue systems Twister
Installation options
Minimal space for wall duct (mm)
V 550 550
W 725 725
X 530 530
X1 1270 1620
Y 1495 1495
Y * 1045 1045
Minimal space for roof duct (mm)
V 1305 1305
W 680 680
X 1960 1960
Y 1575 1575
For the parts numbers of components and flue gas ducts, etc.
please refer to the “Maintenance and accessories” chapter.
Flue systems Twister
Minimum space requirements
Ø80/125 Ø80/125
* Distance without concentric pipe between bend and wall duct.
Concentric
Diameter (mm) 80/125 80/125
Max. length (m) 20 20
Max. 45/90° bend 5 5
Parallel (standard diameter)
Diameter (mm) 80 80
Max. length (m) 30 20
L
equivalent
/bend 90° (m) 3.9 3.9
L
equivalent
/bend 45º (m) 1.1 1.1
Parallel (larger diameter for more length)
Diameter (mm) 100 100
Max. length (m) 100 75
L
equivalent
/bend 90º (m) 4.6 4.6
L
equivalent
/bend 45º (m) 1.2 1.1
* All Twisters are also approved for installations where the unit is supplied without
venting materials (C63).
Concentric flues
It is not permitted to use more than the specified number of
bends, even when the duct is shorter than the maximum
length. A 45° bend is equivalent to a 90° bend.
Parallel flues
- The maximum permissible length should be reduced by the
equivalent length of each bend. (Note: for a parallel
installation this means that 3 changes in direction amount
to 6 bends (3 in the supply duct and 3 in the flue).
- The maximum length also applies if a parallel installation has
different supply and flue duct lengths (B23, C53).
- Combined flues (C43) shall be fitted with a condensate drain.
Note: horizontal flue runs must be installed with a fall of at least
5 mm per metre towards the heater.