Rinnai new Zealand Limited
Hotflo Electric Storage Water Heater
Operation and Installation: 11151-C 03-10
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Installation: Plumbing connections
Refer to the diagram in the ‘Plumbing location’ page for the location and specification of each
plumbing connection to the water heater. The water heater has dual handed cold water supply
and hot outlet connections. The brass plugs supplied are used to plug unused connections.
TPR valve connection
The TPR Valve must be fitted before the water heater is operated. Before installation ensure
that the probe is straight and undamaged.
1. Seal the thread with Teflon tape, never use hemp. Make certain the edge of the Teflon tape
does not protrude past the end of the thread.
2. Screw the reducing bush supplied into the fitting on the water heater marked TPR Valve,
then screw the valve into the reducing bush. Leave the outlet pointing down.
3. Tighten the valve using the spanner flats, never use the valve body.
Expansion control valve
The ECV must always be installed after the non return valve and be the last valve installed
before the water heater.
Drain lines
Provision must be made to drain the cylinder before servicing.
Copper drain lines (½” or dn15) must be fitted to the TPR Valve and ECV. The length should
be as short as possible on a continuous downward slope with no restrictions. Length should not
exceed 9 m with no more than three right angle bends.
In areas where pipes are prone to freezing drain lines must be insulated. The drain line must
be provided with an air gap to ensure the line drains completely.
The outlet of drain lines must be positioned over a suitable gully trap so that they are readily
visible and the discharge will not cause injury, damage or nuisance.
