Commercial water heating case studies

Case studies
Commercial
water heating

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contents:Demand Direct
Mt Smart Stadium - Auckland.......................... 4
NZ Army marae - Waiouru................................ 5
Vector Wero Whitewater Park - Auckland........ 6
Sports clubs...................................................... 7
Pitango Soup plant relocation - Auckland.......... 8
Plant & Food Research - Auckland.................... 9
Demand Duo
Bishop Julius Hall - Canterbury........................ 10
Shieling Laboratories - Auckland..................... 11
Sports clubs - Les Mills Howick Auckland........ 12
Nga Taiohi youth forensic unit - Porirua............. 13
Continuous flow with storage backup
Queens Residences - Auckland........................ 14
Demand Rapid
Oxford Court Lifecare Village - Dunedin ......... 15

4 | Rinnai commercial case studies 01-16
Mt Smart Stadium - Auckland
Demand Direct internal manifold system
Change facility upgrade
Solution summary
• 2 x Demand Direct HDi600 pre-assembled
manifold systems
• Rinnai commercial natural draft common flue
Hot water requirement
Hot water on demand producing 72 litres per minute at 42 °C
for male and female changing rooms.
Solution needed to be cost effective with minimal visual
disturbance to the roof line.
The Mt Smart Stadium upgrade
was part of an initiative to
develop a larger sports stadium
with an aim to create a facility to
accommodate community sport,
athletics, rugby league, football,
and NZ Police training as well as
sports competitions.
The change facility upgrade
included two changing rooms
large enough for 35 players,
expanded public toilets, first aid,
and drug testing facilities.
Rinnai solution
Two pre-assembled systems, enabling easy installation, with
three Rinnai INFINITY HDi200 internal units manifolded
together. A common natural draft flue system, venting air
through a common header was used to eliminate the need
to flue each unit separately, and to reduce the number of
penetrations through the roof.
Installation details
• Date of installation November 2015
• Installer W Mattson Plumbing Ltd
• Specifier Burr Mechanical Consulting Limited
Quick and easy installation with
pre-assembled systems and
common flue.

Rinnai commercial case studies 01-16 | 5
NZ Army marae - Waiouru
Demand Direct external manifold system
New hot water system
Solution summary
• 1 x Demand Direct HD600 pre-assembled manifold system
Hot water system for simultaneous use of the following:
• 6 x showers and sinks
• 2 x washing machines
Peak usage hours with high demand—low use in other periods.NZ Army marae based in Waiouru.
The complex comprises of a
wharenui (meeting house),
wharehoroi (ablutions), and
wharekai (dining hall). It will
cater for more than one hundred
people.
Rinnai solution
Demand Direct HD600, comprised of three Rinnai INFINITY
HD200 external units. The HD units are mounted and fully
assembled to pre-engineered frames with foam insulated
pipes. This system comes with manifold electronic control
staging, so only the required number of water heaters start to
match the demand for hot water. The sequence is rotated so
there is even use of each water heater.
• Date of installation March 2015
• Installer New Zealand Defence Force
• Specifier Rinnai NZ Ltd
Pre-engineered, fully assembled
and insulated, all ready to be
plumbed in.

Vector Wero Whitewater Park - Auckland
Demand Direct internal condensing manifold system
Lower operating cost hot water solution
Solution summary
• 1 x Demand Direct EFi630 internal condensing manifold
system
• 1 x EF250 external
• Hot water for changing rooms
• Hot water for kitchen and hand wash station
As the site operated on LPG bottles there was a requirement for
the units to be as efficient as possible, as well as having a small
installation foot print.
Vector Wero Whitewater Park,
located next to the Vodfone
Events Centre in Manukau.
The park is New Zealand's first
purpose-built whitewater facility.
It has two rivers to suit different
skill levels, and offers rafting,
stand-up paddleboarding, and
kayaking activities.
Rinnai solution
As efficiency was the main driver EF250 models were used.
These models, with condensing technology, have a thermal
efficiency of 95% as compared to 83% for the standard HD
models. The Demand Direct systems can also have a small
foot print. Removing the base skid the system can be installed
directly on a wall.
• Date of installation May 2016
• Installer DH Wright Plumbing Ltd
• Specifier eCube Building Workshop Ltd
EFi250 condensing manifolded
units operate more efficiently
than standard HDi200 units,
saving on operational and life
cycle costs.

Sports clubs
Demand Direct 'on-demand' manifold systems
Only heating water as it is needed
Solution summary
• Demand Direct pre-assembled manifold system
Rinnai has on-demand systems for sports facilities that
provides hot water without the need to continally store and
heat water in cylinders. The Demand Direct system uses the
intelligence contained within the Rinnai INFINITY and the
manifold (MECS) system to control energy input and hot
water output. The MECS system will control up to five Rinnai
INFINITY water heaters, and banks of up to five can be installed
in parallel.
Running out of hot water on busy
days is a common problem for
sports clubs. Hot water usage
for most sports clubs center
around game or training times,
and for gyms, peak periods in the
morning and evening.
Recent Demand Direct
installations:
• Sumner Surf Club -
Christchurch
• Taieri Rugby Football Club -
Mosgiel
• Seddon Domain Rugby
changing room - Blenheim
• UOW High Performance Sports
Center - Tauranga
• Invercargill Rugby Club
• Victoria Park Rugby Club -
Palmerston North
Once the Demand Direct system is installed clubs can look
forward to an endless supply of hot water when they need
it. The system's compact design makes it simple to install
and operates only when needed, saving energy and ongoing
running costs.
The manifold electronic control
system will turn on each unit
as required to meet demand,
efficiently controlling energy
use.

Pitango Soup plant relocation - Auckland
Demand Direct internal manifold system
New hot water solution
Solution summary
• 1000 litres every 15 minutes at 60 °C
• 40 litres per minute at 45 °C
As a new development the engineer had a requirement for a
heavy duty efficient system to be installed in a roof space.
Pitango started 15 years ago
selling fresh homemade soup
from the back of a van. Using
the freshest of ingredients and
making all their stocks from
scratch, it's hard to miss their
colourful soups and meals in
supermarket chillers.
Rinnai solution
Two separate pre-assembled skid systems were designed to be
easily installed into the roof space. One system was dedicated
to provide hot water for food processing and the other for
washing down equipment.
• Installer Ariel Plumbing & Gasfitting
• Specifier TEG Pty Australia
Rinnai INFINITY HDi200
units can be installed almost
anywhere. These units were
installed in a roof space and
flued through the roof.

Plant & Food Research - Auckland
Demand Direct internal condensing manifold system
New hot water system
Solution summary
• 1 x Demand Direct EF420 internal condensing manifold
system
• 2 x Demand Direct EF620 internal condensing manifold
system
• BMS error indication switch
Three hot water systems, two supplying domestic hot water for
the Hamilton and Cunningham buildings, and one hot water
system dedicated to the laboratory.
Plant & Food Research decided
to re-purpose two major
buildings at their Mt Albert
campus. The largest building
is the seven storey Hamilton
building, which is undergoing
significant remediation work,
and the Cunningham Building
that converted office and storage
space into new social and formal
meeting areas.
Rinnai solution
Pre-assembled system with a 315 L storage cylinder and Rinnai
INFINITY EFi250 internal condensing units (DD420 - 2 x EFi250,
DD620 - 3 x EFi250). The EF units were flued individually—
terminating horizontally. The systems were also specified with
a built-in BMS error indicator switch.
• Installer Hanlon Plumbing
• Specifier eCubed Building Workshop Ltd
Systems can be easily scaled
to cater for different hot water
demands.

Bishop Julius Hall - Canterbury
Demand Duo internal
Halls of residence
Solution summary
A Demand Duo continuous flow with storage backup system
comprised of:
• 1 x 315 L storage cylinder
• 4 x Rinnai INFINITY HDi200 internal water heaters
Hot water system to meet peak hour demand for a sixty bed
accommodation block equipped with high performance
showers and basins.
Bishop Julius Hall has been
serving the University of
Canterbury students for almost
one hundred years. The new
sixty bed block building has been
engineered by Cosgroves based
in Christchurch.
Rinnai solution
A Demand Duo system that uses a combination of four Rinnai
INFINITY HDi200 internal units, a 315 L storage backup cylinder,
and individual flueing terminating horizontally through a wall.
This type of system is used where the total water demand
during the day's peak hot water period is known, but the rate
of use varies.
• Date of installation December 2015
• Installer HPPS Ltd
• Specifier Cosgroves Limited
The system offers the flexibility
of sizing the appropriate
number of Rinnai INFINITY
water heaters and different
hot water storage capacities
to supply specific hot water
volumes.

Shieling Laboratories - Auckland
Customised Demand Duo
Hot water system upgrade
Solution summary
• 1 x Demand Direct HD750 manifold system set at 85 °C
• 1 x 2000 L stainless steel tank (not supplied by Rinnai)
• 1 x DDSTAT hot water system controller
• 2 x pumps (for duty and standby)
According to Oliver Hoffman (MD), the old system was
impractical, inefficient and needed an upgrade. Rinnai was
requested to design a centralised hot water system capable of
delivering 150 L/min. at 70 °C per batch, or deliver 1200-1600
litres of 70 °C water during peak hour demand. The system also
needed to be located outside.
Shieling Laboratories are New
Zealand's leading contract
manufacturer of skincare
cosmetics, toiletries and personal
care products, providing
innovation, and quality products
to New Zealand's leading brands
and retailers.
Rinnai solution
Three Rinnai INFINITY HD250 external units manifolded, set at
85 °C, were combined with a 2000 L stainless steel buffer tank,
which was set at 75 °C. The HD250 units provided the total hot
water requirements, with the tank allowing for peak demand.
The hot water system is capable of delivering approximately
4000 L at 75 °C in the first hour, then 2400 L every hour after
that.
• Date of installation December 2015
• Installer PBJ Industries Ltd
Flexible system that can
integrate easily with other hot
water system components.

Sports clubs - Les Mills Howick Auckland
Customised Demand Duo
New hot water ring main system
Solution summary
• 1 x Demand Direct DD1000 pre-assembled 50 mm manifold
system
• Commercial XL buffer cylinder
• 1 x DDTSTAT controller
Centralised hot water plant to serve shower blocks, a laundry,
and dish washing sinks. The expected hot water demand of
8240 L/hr at 40 °C occurs during the peak 1-2 hour period in
the mornings and evenings.
First opening in 1968, Les Mills
gyms now have 12 New Zealand
owned and operated clubs
throughout the country.
Rinnai has also developed hot
water systems for the Takapuna
and Newmarket gyms.
Rinnai solution
Demand Duo system with a combination of four Rinnai
INFINITY HD250 external continuous flow gas water heaters
with a large XL storage cylinder. The storage cylinder is
available to accommodate high peak flow rates for short
periods of time. The system delivers 8880 L/hr at 40 °C in the
first hour, then 7650 L/hr at 40 °C every hour after that.
• Date of installation April 2016
• Installer Southern Cross Plumbing,
Amazon Plumbing & Gas,
Quix Plumbing Ltd
Customised system allows the
water heaters to be mounted
externally on a roof, 10 m away
from the tank and pump, which
are installed in a small plant room.

Nga Taiohi youth forensic unit - Porirua
Customised Demand Duo internal hot water system
New customised hot water system
Solution summary
• 1 x HD800 pre-assembled manifold system
• 1 x 1000 L XL cylinder
• 1 x BMS error indication switch
• 1 x DDSTAT hot water system controller
Due to site restrictions the main criteria, aside from hot water
supply, was to develop a BMS system, which could be operated
remotely. The Rinnai error indication switch will advise the
status of the system and report any fault issues associated
within each unit, and provide a signal to the building
management system.
Nga Taiohi youth inpatient mental
health service is a new purpose
built specialist ten bed unit for
the treatment of youth offenders
with mental health and drug and
alcohol issues.
Rinnai solution
The HD800 is made up of four Rinnai INFINITY HDi200 internal
units, each individually flued with a horizontal flue termination.
The units are manifolded and connected to a Rinnai BMS error
indication switch. The HD800 system is connected to a 1000 L
XL cylinder with a DDSTAT thermostat/controller.
• Installer John Leen Plumbing Ltd
• Specifier Pacific Consultants
BMS error indication switch can
be connected to a BMS system
to trigger an alarm when an
error has occurred with the hot
water system.

Queens Residences - Auckland
Continuous flow with storage backup
Queen Street apartments
Solution summary
• 1 x internal back-to-back pre-assembled manifold system
• Rinnai commercial fan assisted common flue system
• 6 x 350 L cylinders (not supplied by Rinnai)
Hot water system to serve 250 apartments.
The initial design comprised of two boilers, common flue, and
storage tanks, however inability by the manufacturer to supply
a flue system meant an alternate design with a small footprint
was required.
The Queens Residences is
an iconic landmark building
welcoming you home to a
vertical village. Designed by
award winning Leuschke Group
architects, Queens Residences
comprises a $150 million planned
new residential and retail
development located on Queen
Street.
Rinnai solution
A pre-assembled back-to-back skid containing two banks
of four Rinnai INFINITY HDi200 internal units manifolded
together. The restricted space and enclosed area required
the units to be flued with a Rinnai commercial fan assisted
common flue system.
• Installer Hanlon Plumbing Ltd
• Specifier Hydraulic Services Consultants
NZ Limited
Hydraulic engineer likes the
small footprint that the back-
to-back system offers and is
considering using this type
of system again for another
apartment project.

Oxford Court Lifecare village - Dunedin
Demand Rapid and Demand Duo
Two separate hot water systems
Solution summary
• 1 x Demand Rapid (DD1200E315L) system
• 1 x Demand Duo 600 external pre-assembled manifold
system
The design requirement was to provide hot water to the 48
room care facility, and a separate system for the kitchen and
laundry area. Only 8-10 residents shower at one time, so hot
water demand has been calculated on this simultaneous use as
opposed to the full 48 room capacity.
Oxford Court Lifecare is a
purpose built facility providing
rest home and hospital care. Their
existing 1997 hot water system
was undersized and in need of an
upgrade to cope with increased
demand.
Rinnai solution
A DD600 external system was specified for the care facility to
meet peak hour demand. The DD600 will provide 2379 L/hr at
60 °C, incoming water temperature calculated for worst case
scenario in winter of 5 °C. A dedicated Rinnai Demand Rapid
system was specified for the commercial kitchen and laundry
facility where a large volume of water is needed quickly, with
recovery time before being used again.
• Date of installation April 2016
• Installer Gas & Water Ltd - Dunedin
Cater for smaller hot water
requirements with a separate
Rinnai Demand Rapid system,
shown on the far right of the
photo.

Rinnai.co.nz
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