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Rinnai Australia 27 Installation Manual
CONDENSATE DRAIN (REU-KM’ MODELS ONLY)
The INFINITY ENVIRO 32 (REU-KM3237WD) and INFINITY ENVIRO 26 (REU-KM2635WD) water
heaters generate condensate continuously at a rate of up to 5 litres per hour as a by-product of highly
efficient gas burner system. This condensate must be drained via a pipe to a suitable point of
discharge. Because the condensate is a by-product of gas combustion it is mildly acidic. For this
reason copper tube and fittings MUST NOT be used as it will corrode. Instead, Rinnai recommend
plastic pipes and fittings such as Unplasticised Polyvinyl Chloride (UPVC) or Polyethylene (PE) which
is commonly used for irrigation piping.
IMPORTANT CONSIDERATIONS FOR THE CONDENSATE DRAIN PIPE
Water heater drain outlet connection, ½” (20mm) BSP male.
PE ½” BSP (20mm) female to barbed irrigation system connector (13 – 19mm) or equivalent
plastic fitting.
Drain pipe and fittings to match item .
Continuous fall (of at least 2°) from water heater to discharge point. Lengths and bends in
accordance with ‘LENGTH AND CHANGES OF DIRECTION’ below.
Suitable points of discharge are deemed to be drains, sewers or pits. DO NOT discharge onto
electrical connections, earth stakes, copper pipes, concrete paths or into a pond.
INSTALLATION
(a) The drain line MUST NOT discharge onto electrical connections, earth stakes, copper pipes,
concrete paths or into a pond.
(b) The point of discharge from each drain line shall be located so that the release of condensate
does not cause a nuisance, is readily discernible and incurs no risk of damage to the building.
In view of (a) and (b), suitable points of discharge are deemed to be drains, sewers or pits.
(c) There shall be no tap, valve or other restrictions in any line.
(d) Each line shall fall continuously from the valve to the approved point of discharge.
(e) Drain lines shall not discharge into a storage water heater safe tray.
(f) The end of the condensate drain line shall be:
(i) not lower than 200 mm or higher than 300 mm above an unpaved surface; or
(ii) not lower than 75 mm or higher than 300 mm above a gravel pit not less than 100 mm in
diameter in a paved surface.
The content of AS3500.4:2003 Section 5.12 ‘Temperature / Pressure Relief and
Expansion Control Valve Drain Lines’ has been used as a guide in preparing these
considerations.
LENGTH AND CHANGES OF DIRECTION
Maximum length and changes of direction
greater than 45 ° should be as follows:
Lengths and changes of direction
Max length (Metres) 9 8 7 6
Max changes of direction >45° 3 4 5 6
NOTE
A
B
C
B
D
E
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