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Drain requirements Figure 9.7.6
1 Boiler
2 Visible air break
3 75mm trap
4 Visible air break and trap is not required because there is a trap
with a condensate seal of 180mm incorporated into the boiler
(minimum requirement is 75mm)
5 Soil and vent stack
6 Invert
7 450mm minimum up to three storeys
8 Minimum internal diameter 19mm (fall at least 45mm per meter)
9 Pipe size transition
10 Minimum internal diameter 30mm
11 Water/weather proof insulation
1 Condensate discharge pipe from boiler
2 Pipe size transition point
3 Water/weather proof insulation
4 43mm 90° male/female bend
5 External rain water pipe into foul water
6 External air break
7 Air gap
8 68 mm ø PVCu strap-on tting
9 Minimum internal diameter 19mm
10 Minimum internal diameter 30mm
11 End cut at 45°
Drain requirements Figure 9.7.4 Drain requirements Figure 9.7.5
Drain requirements Figure 9.7.7
1 Boiler
2 Visible air break
3 38mm minimum trap
4 Visible air break and trap is not required because there is a trap
with a condensate seal of 180mm incorporated into the boiler
(minimum requirement is 38mm)
5 External length of pipe 3m maximum
6 Open end of condensate drainage pipe direct into gully 25mm
min below grating but above water level; end cut at 45°
7 Minimum internal diameter 19mm (fall at least 45mm per meter)
8 Pipe size transition point
9 Minimum internal diameter 30mm
10 Water/weather proof insulation
1 Condensate discharge pipe from boiler
2 Ground (this section of the condensate drainage pipe may be
run either above or below ground level); End cut at 45°
3 Diameter 100mm minimum plastic tube
4 Bottom of tube sealed
5 Limestone chippings
6 Two rows of three 12mm holes at 25mm centres, 50mm from
bottom of tube and facing away from house
7 Hole depth 400mm minimum by 300mm diameter
8 Minimum internal diameter 19mm (fall at least 45mm per meter)
9 Pipe size transition point
10 Minimum internal diameter 30mm
11 Water/weather proof insulation
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