Baxi Potterton 24 Eco HE manual Condensate Drain

7.0SITE REQUIREMENTS

7.6Condensate Drain

FAILURE TO INSTALL THE CONDENSATE DISCHARGE PIPEWORK CORRECTLY WILL AFFECT THE RELIABLE OPERATION OF THE BOILER

The condensate discharge pipe MUST NOT RISE at any point along its length. There MUST be a fall of AT LEAST 2.5° (50mm per metre) along the entire run.

1.	The condensate outlet terminates in a 1” BSP nut and
seal for the connection of 21.5mm (3/4in) plastic overflow
pipe which should generally discharge internally into the
household drainage system. If this is not possible,
discharge into an outside drain is acceptable.
2.	Ensure the discharge of condensate complies with any
national or local regulations in force.
BS 6798:2000 & Part H1 of the Building Regulations
give further guidance.
3.	The discharge pipe should be run in a proprietary drain
pipe material e.g. PVC, PVC-U, ABS, PVC-C or PP.
4.	Metal pipework is NOT suitable for use in condensate
discharge systems.
5.	The pipe should be a minimum of 21.5mm diameter
and must be supported using suitably spaced clips to
prevent sagging.
6.	Any pipe fitted externally must not exceed 3 metres.
7.	Any condensate discharge pipework external to the
building (or in an unheated part of it e.g. garage) must
be insulated to protect against frost. It is also
recommended that the pipe diameter is increased to
32mm.
8.	If the boiler is fitted in an unheated location the entire
condensate discharge pipe should be treated as an
external run.
9.	In all cases discharge pipe must be installed to aid
disposal of the condensate. To reduce the risk of
condensate being trapped, as few bends and fittings as
possible should be used.
10. When discharging condensate into a soil stack or
waste pipe the effects of existing plumbing must be
considered. If soil pipes or waste pipes are subjected to
internal pressure fluctuations when WC's are flushed or
sinks emptied then back-pressure may force water out of

Boiler	Termination to an internal soil
	and vent pipe

50mm		per
		metre
			of
2.5°	Minimum			pipe	run
		fall

450mm min

				External termination via internal
						discharge branch
	Boiler
				e.g sink waste - downstream
Sink	50mm		per				Pipe must terminate
				metre			above water level but
				of			below surrounding
	2.5°				pipe	run
		Minimum					surface
				fall

External termination to a drain or gully

Boiler

Pipe must terminate above water level but below surrounding surface

50mm	per
		metre
		of
		pipe
2.5°		Minimum	run
		fall

External termination to a purpose

made soak-away

the boiler trap and cause appliance lockout.

Examples are shown of the following methods of termination:-

i)to an internal soil & vent pipe

ii)via an internal discharge branch (e.g. sink waste)

iii)to a drain or gully

iv)to a purpose made soakaway

Boiler

50mm	per
		metre
		of
		pipe
2.5°		Minimum	run
		fall

500mm min

Holes in the soak-away must face away from the building

Publication No. 5111811 15