Rheem 953060DP Owner's Manual And Installation Instructions page 30

INSTALLATION
The water heater must not be installed in an area with a corrosive atmosphere
where chemicals are stored or where aerosol propellants are released.
Remember the air may be safe to breathe, but the chemicals may attack the
materials used in the heat pump system.
SAFE TRAY
Under certain installation conditions where damage to property can occur in the
event of the water heater leaking AS/NZS 3500.4 requires the water heater be
installed in a safe tray. Construction, installation and draining of a safe tray must
comply with AS/NZS 3500.4 and all local codes and regulatory authority
requirements. In New Zealand the safe tray must also meet the requirements of
Clause G12 of the New Zealand Building Code. AS/NZS 3500.4 and the NZBC
also have particular requirements when a safe tray must be installed.
Alternatively, where additional leak protection is required for installations not
defined by AS/NZS 3500.4, a suitable bund may be constructed to surround the
water heater in lieu of using a safe tray.
TANK WATER SUPPLY
If the storage tank is supplied with water from a tank supply and a pressure pump
system is not installed, then the bottom of the supply tank must be at least 1 m
above the highest point of the hot water plumbing system, including the storage
tank. Care must be taken to avoid air locks. The cold water line to the storage
tank should be adequately sized and fitted with a full flow gate valve or ball valve.
MAINS WATER SUPPLY
Where the mains water supply pressure exceeds that shown in the table below,
an approved pressure limiting valve is required and should be fitted as shown in
the installation diagram (refer to diagram on page 50.
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