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PLUMBING CONNECTION
AUTUMN 2015
10. The water heaters in the manifold must be of the same
model type.
11. Refer to the following diagram for examples of manifold
principals associated pipe work designs and valve
positioning.
SERIES VS. PARALLEL INSTALLATION
The Rheem Equa Flow principle requires the connection
of units in parallel. Early design and installation practices
involved the installation of multiple water heaters in series
i.e. the outlet of the first water heater was connected to the
inlet of the second unit and so on…
The pros and cons of installing a bank of water heaters in
parallel and in series are shown in the following table.
HEAT TRAPS
When installing a mains pressure storage water heater
without an inbuilt trap and running the heated water piping
“up and over” to connect to fixtures, it is necessary to install
a heat trap to avoid during periods of no hot water use,
heated water naturally rising up the pipe until it cools and
then falling back to the water heater due to its increased
density.
This activity within the pipe line will increase heat loss and
subsequent running costs of the system.
The new range of Rheem Stellar Stainless Steel electric
storage water heaters from 80 up to 315 litre capacity are
designed with the hot water outlet at the very top of the unit.
When plumbed in a vertical rise from this outlet position
on the system, the manual installation of a heat trap with a
minimum fall of 250mm is required to not allow the pathway
for heat loss to occur.
HOT WATER CLINIC
JON PALFREY
SERIES VS. PARALLEL INSTALLATION
SERIES
PARALLEL
Flow is limited to that
obtainable from one water
heater.
Flow is proportional to the
number of heaters in a bank;
i.e. 2 water heaters can give
twice the flow of one water
heater, 3 water heaters three
times the flow etc.
Pressure loss increases as
water passes through each
water heater.
Pressure loss of the entire bank
is equal to the pressure loss of
one water heater.
First water heater in line does
most work. Second water
heater may not operate other
than to maintain losses.
All units do equal share.
Full recovery only when last
water heater in line is operating.
Full recovery when any water
is used.
Breakdown of one unit and
removal for service closes down
whole operation.
Any unit can be closed off
at anytime, leaving rest in
operation.
range of water filters
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I.M.P.A.C.T. 4-in-1
Aqua-Pure’s new filter technology is a
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‘Smart’ Indicator
Built in LED indicator that changes from
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or contact us on
1300 345 837
AVAILABLE FROM LEADING PLUMBING OUTLETS