Worcester Greenstar Heatslave 12/18 Technical Information page 14

Calculating the flue length
The diagrams (opposite) show the components used and
the maximum flue length (L) for each flue configuration.
To achieve the maximum flue length (L), a flue section will
have to be reduced in length.
Only flue extensions can be reduced in length by cutting.
Important: All horizontal sections must rise away from the
boiler by 52mm per metre (3º) to allow condensate to drain
back to the boiler.
1). Measure the total flue length required, noting that the
maximum straight flue length including the terminal is:
Flue diameter 80/125mm dia.
Greenstar Heatslave series
Maximum flue length 2,000mm*
Greenstar Heatslave External series
Maximum flue length 2,000mm*
*From the boiler casing, (the horizontal kit bend is ignored when calculating the
flue length).
2). Reduce the total straight flue length for each extra flue
bend by:
• 1,000mm for each 90º bend
• 500mm for each 45º bend.
Flue extension lengths:
Horizontal 1,000mm overall length. Effective length when
engaged into sockets within the flue run is 950mm.
Flue terminal lengths:
Horizontal 80/125mm dia.: 305mm
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80/125mm dia. horizontal external flue kit –
Comprises:
1 x terminal assembly
1 x 80/125 weather seal
1 x external bend
1 x external cabinet flue seal and plate
1 x clamp bracket
1 x drill pack
Part No. 7 716 190 057
Accessories
Worcester Part No.
80/125mm dia. 100/150mm dia.
External Flue Extension 7 716 190 054 7 716 190 060
External 90º Bend 7 716 190 055 –
External 45º Bends (pair) 7 716 190 056 7 716 190 061
Horizontal terminal option
Maximum total straight flue length
80/125mm dia.
Heatslave series 2,000mm*
Heatslave External series 2,000mm*
Flue components required
Flue Diameter Description Quantity Worcester Part No.
Greenstar Heatslave series
125mm Horizontal External Flue Kit 1 7 716 190 057
125mm External Flue Extension up to 2 7 716 190 054
Greenstar Heatslave External series
125mm Horizontal External Flue Kit 1 7 716 190 057
125mm External Flue Extension up to 2 7 716 190 054
*From the boiler casing, (the horizontal kit bend is ignored when calculating the
flue length).
Vertical balanced
external flue
Balanced flue terminal and extensions
Vertical terminals only:
• The terminal must extend beyond the roof or wall by
600mm.
• The terminal must be at least 600mm horizontally from any
vertical structure.
• Each extension must be supported using the wall clamps
supplied or a suitable alternative.
Calculating the flue length
To achieve the maximum flue length (L), a flue section will
have to be reduced in length.
Only flue extensions can be reduced in length by cutting.
Important: All horizontal sections must rise away from the
boiler by 52mm per metre (3º) to allow condensate to drain
back to the boiler.
1). Measure the total flue length required, noting that the
maximum straight flue length including the terminal is:
Flue diameter 80/125mm dia. 100/150mm dia.
Greenstar Heatslave series
Maximum flue length 6,000mm* –
Greenstar Heatslave External series
Maximum flue length 6,000mm* –
*From the boiler casing, (the vertical kit bend is ignored when calculating the
flue length) maximum 2m of horizontal flue.
2). Reduce the total straight flue length for each extra flue
bend by:
• 1,000mm for each 90º bend
• 500mm for each 45º bend
Flue extension lengths:
Vertical 1,000mm overall length. Effective length when
engaged into sockets within the flue run is 950mm.
Flue terminal lengths:
Vertical 80/125mm dia.: 185mm + cage
Vertical 100/150mm dia.: 270mm + cage
80/125mm dia. vertical external flue kit
Comprises:
1 x terminal assembly
1 x 80/125 weather seal
1 x external bend
1 x external cabinet flue seal and plate
1 x clamp bracket
1 x drill pack
Part No. 7 716 190 053
Accessories
Worcester Part No.
80/125mm dia.
External Flue Extension 7 716 190 054
External 90º Bend 7 716 190 055
External 45º Bends (pair) 7 716 190 056
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