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59
CONNECTIONS – PLUMBING
All plumbing work must be carried out by a qualified person and in compliance with the Standard
AS/NZS 3500.4 and all local codes and regulatory authority requirements. In New Zealand the installation must
conform to Clauses G11, G12 and H1 of the New Zealand Building Code.
All gas work must be carried out by a qualified person and in compliance with the Standard AS 5601 or
AS/NZS 5601.1, as applicable under local regulations, and all local codes and regulatory authority
requirements.
CONNECTION SIZES
Hot water connection
R 3/4
Cold water connection
R 3/4
Gas inlet
R 3/4
WATER INLET AND OUTLET
All pipe work must be cleared of foreign matter before
connection and purged before attempting to operate the
water heater. All olive compression fittings must use brass
or copper olives. Use an approved thread sealant such as
Teflon tape on all threaded joints.
A full flow gate valve or ball valve must be installed on the
cold water line or solar preheat water line to the water
heater. A non-return valve or stop tap must not be
installed. An acceptable arrangement is shown in the
diagram. Refer also to
“Hot Water Delivery” on page 49 and
to “Mains Water Supply” on page 48.
A disconnection union must always be provided at the cold water inlet and hot water outlet on the water heater
to allow for disconnection of the water heater.
Insulation used on the cold and hot water lines must extend up to the cold water inlet and hot water outlet of
the water heater.
Notes:
It is essential all pipe connections be correctly aligned, otherwise component connections within the water
heater may be strained and / or components themselves misaligned. It is recommended also, wherever
possible, pipe connections be made at the water heater first and final pipe runs be made in soft copper
pipe to allow some adjustment for misalignment.
Use the spanner flats on the water heater fittings and take care to avoid twisting the water inlet and outlet
pipes inside the jacket.
PIPE SIZES
The pipe sizing for hot water supply systems should be carried out by persons competent to do so, choosing
the most suitable pipe size to ensure adequate flow for each individual application. Reference to the technical
specifications of the water heater and local regulatory authority requirements must be made.
To achieve true mains pressure operation, the cold water line to the water heater should be the same size or
bigger than the hot water line from the water heater.
The minimum recommended cold pipe or solar preheat pipe and hot pipe size is DN20.
Gas Water Heater
Cold (or Solar Preheat) and Hot Water
and Gas Connection Details
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