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FLUE REQUIREMENTS
The flue must be installed by a competent, authorised person. It is the installer's
responsibility to ensure that the unit has been installed to all current local
requirements.
Ensure that the flue terminal and hot water outlet connection cannot be touched by children.
The flue must be clear of obstructions and shrubbery.
Concentric Flues
The Rinnai Infinity Condensing water heaters internal units may only be installed with the
approved Rinnai Infinity and HD flue kit provided. These instructions only apply to coaxial
Rinnai Flues. If in doubt contact Rinnai UK.
The required clearance of the flue terminal is shown on page 31. When multiple units are
installed together there must be enough clearance to satisfy the requirements of the
regulations. Under current regulations the heaters should have at least a 100mm clearance
between them. The flue terminal should be over 2m from ground level whenever possible.
For lower installations a terminal guard cage must be installed.
Flue Length
The maximum flue total equivalent length is 15m.
2m must be subtracted from the total equivalent length for each 90° bend and 1m for each
45° bend. A maximum of four 90° bends can be used.
Common Header (Cascade) Flues
Do not connect this appliance into any common header flue, cascade system, or natural
draught chimney. For information on these installations contact Rinnai.
Separate instructions are provided with the flue system detailing the installation of the flue
components.
It is important that any condensate is kept away from the heat exchanger. The flue should tip
away from the unit without a condensate trap, and towards the unit if there is a trap.
It is the responsibility of the installer to locate the appropriate place for the terminal.
The drain pipe should be run in 22mm PVC, uPVC, or ABS pipe, copper is not
recommended. The drain pipe MUST be trapped.
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