BS6798:2000 - Specification for installation of gas-fired boilers of rated input not exceeding 70 kW net. The regulation gives practical guidance to gas operatives when engaged in installing and maintaining gas-fired boilers used in the domestic sector.  The standard, which should be read in conjunction with the particular manufacturers installation instructions for a given appliance, gives advice on appliance installation, maintenance, testing etc.

As we are only interested in the condensation hookup here I have included the images and description given by most boiler manufacturers in the installation manual. I have yet to see any manufacturer who doesn’t include guidance as to the correct installation of their own specific boiler. The installation methods are taken with the above standards in mind and you will not see any other method of hookup than these.

external-condensate-absorption-point

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Picture 1 of 5

A – Condensate from the boiler built in siphon or trap

B – Basin with integrated overflow

C – 21.5mm plastic overflow pipe

D – External drain or gully

E – Internal soil and vent stack

F – Working (serviceable) condensate trap of 75mm depth minimum

G – 300mm x 100mm diameter sealed plastic tube

H – Ground level

I – not used for residential diagrams

J – Drainage holes faced away from building and foundation

K – Limestone chippings

L – Weather resistant insulation

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