Solahart Continuous Flow User manual

This water heater must be installed and serviced by a qualified person.
Please leave this guide with the householder.
Continuous Flow
Gas Booster
SOLAR WATER HEATER
OWNER’S MANUAL
AND
WARRANTY / INSTALLATION INFORMATION
WARNING: Plumber –Be Aware
Use copper pipe ONLY. Plastic pipe MUST NOT be used.
It is a requirement of a solar water heater installation that all pipe work be in copper
and not plastic, due to the effects of high water temperatures and pressures.
Solahart Industries Pty Ltd
ABN 45 064 945 848

PATENTS
This water heater may be protected by one or more patents or registered designs in the name of
Solahart Industries Pty Ltd, Rheem Australia Pty Ltd or Paloma Co., Ltd.
Solahart Industries Pty Ltd is the supplier of the Solahart range of continuous flow gas water heaters,
manufactured by Paloma Co., Ltd., a world leader in water heater technology and manufacture.
TRADE MARKS
® Registered trademark of Solahart Industries Pty Ltd or Rheem Australia Pty Ltd.
TM Trademark of Solahart Industries Pty Ltd or Rheem Australia Pty Ltd.
Note: Every care has been taken to ensure accuracy in preparation of this publication.
No liability can be accepted for any consequences, which may arise as a result of its application.
Warning: Upon completion of the installation and commissioning of the water heater, leave this guide
with the householder or a responsible officer. DO NOT leave this guide inside of the cover of the water
heater, as it may interfere with the safe operation of the water heater or ignite when the water heater is
turned on.

3
CONTENTS
HOUSEHOLDER - We recommend you read pages 4 to 13.
The other pages are intended for the installer but may be of interest.
About Your Water Heater............................................................................................................ 4
Water Supplies........................................................................................................................... 10
Save A Service Call................................................................................................................... 11
Installation –Water Heater ....................................................................................................... 14
Connections –Plumbing .......................................................................................................... 23
Connections –Electrical........................................................................................................... 24
Multiple Installations................................................................................................................. 25
Commissioning.......................................................................................................................... 28
Draining The Water Heater ....................................................................................................... 36
Warranty..................................................................................................................................... 37
Solahart Offices......................................................................................................................... 40

4
ABOUT YOUR WATER HEATER
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
MODEL TYPE
The Solahart®continuous flow water heater model you have chosen is for outdoor installation only and is
only suitable for use with a solar water heater with an over temperature protection system, unless a solar
transfer or solar bypass valve is installed. This water heater has been installed as an in-series gas booster to
a solar water heater. For information relating to the function and operation of the solar water heater, refer to
the Owner‟s Guide and Installation Instructions supplied with the solar water heater.
MAINS PRESSURE
The water heater is designed for direct connection to the mains water
supply. If the mains supply pressure in your area exceeds that shown on
page 16, a pressure limiting valve must be fitted. The supply pressure
should be greater than 140 kPa for the rated flow and performance to be
achieved.
WATER HEATER OPERATION
The water heater operates automatically if heating of the water is required.
When a hot tap is opened and the solar heated water temperature is below
58°C, the gas burners ignite to provide immediate heating of the water to
its preset outlet temperature setting as the water passes through the water
heater. The heat produced by the burner is transferred to the water through
the heat exchanger. The water is heated to a constant temperature by the
automatic adjustment of the gas supply to the burner to suit the water flow
rate. The gas burners extinguish when the hot tap is closed.
Automatic safety controls are fitted to the water heater to provide safe and
efficient operation.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the water heater has not operated for some time (which is most often first thing
in the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat
exchanger warms up. This is both an energy and water saving feature of this water heater. Once the
heat exchanger has warmed up the hot water flow will increase and remain at normal flow levels. This
feature will only occur at a cold start-up and not when the heat exchanger is already warm from a recent use
of hot water.
GAS BOOSTING FOR A SOLAR WATER HEATER
Water stored in the solar storage tank passes through the in-series gas booster when a hot tap is opened.
The in-series gas booster is for heating water at times of low solar energy gain, such as during cloudy or
rainy weather, or during colder months.
Solar heated water can reach temperatures up to 70°C to 80°C for a Streamline pumped system or up to
85°C for a Thermosiphon system with an over temperature protection system and possibly higher for a
Thermosiphon system without an over temperature protection system. The in-series gas booster operates
automatically. When the solar heated water temperature is 58°C or higher, the flow passes through the in-
series gas booster without boosting. When the solar heated water temperature is below 58°C, the in-series
gas booster heats the water to its preset outlet temperature setting.

ABOUT YOUR WATER HEATER
5
HOW HOT SHOULD THE WATER BE?
The solar water heater will deliver water at temperatures up to 70°C to
80°C for a Streamline pumped system or up to 85°C for a Thermosiphon
system with an over temperature protection system and possibly higher for
a Thermosiphon system without an over temperature protection system.
During periods of low solar energy gain, the in-series gas booster will boost
the water temperature automatically to its preset outlet temperature setting.
The factory preset outlet temperature setting is 60°C.
Note: The preset outlet temperature setting of this water heater cannot be
adjusted by the householder. The setting can only be adjusted by the
installer or a Solahart Dealer.
Note:AS 3498 requires that a water heater provides the means to inhibit
the growth of Legionella bacteria in potable water. When this water heater
is used as an in-series booster for a solar water heater it can satisfy this
AS 3498 requirement provided it is energised, the booster preset outlet
temperature setting is 70°C or higher, and that a remote temperature
controller is not used.
Warning: Temperature controllers must not be fitted to this water heater as part of a solar water heater
system because water at a temperature much higher than the controller setting can be delivered.
HOTTER WATER INCREASES THE RISK OF SCALD INJURY
This water heater can deliver water at temperatures which can cause scalding. Check the water temperature
before use, such as when entering a shower or filling a bath or basin, to ensure it is suitable for the
application and will not cause scald injury.
We recommend and it may be required by regulations that an approved temperature limiting device be fitted
into the hot water piping to the bathroom and ensuite when this water heater is installed. This will keep the
water temperature below 50°C at the bathroom and ensuite. The risk of scald injury will be reduced and still
allow hotter water to the kitchen and laundry.
in-series gas booster
factory preset outlet
temperature setting
maximum
recommended supply
temperature to
bathrooms and
ensuites

ABOUT YOUR WATER HEATER
6
WARNING
This water heater is only intended to be operated by persons who have the experience or the knowledge and
the capabilities to do so. This water heater is not intended to be operated by persons with reduced physical,
sensory or mental capabilities i.e. the infirm, or by children. Children should be supervised to ensure they do
not interfere with the water heater.
The water heater uses 240 Volt AC electrical power for operation of the control systems and the combustion
fan. The removal of the front panel will expose 240 V wiring. It must only be removed by a qualified person.
The power lead from the water heater must be plugged into a weatherproof electrical outlet. Take care not to
touch the power plug with wet hands.
SAFETY
This water heater is supplied with temperature sensors, a FlameSafe®protection system and a pressure
relief valve. These devices must not be tampered with or removed. The water heater must not be operated
unless each of these devices is fitted and is in working order.
If the power supply cord or plug is damaged, it must be replaced by a qualified person in order to avoid a
hazard. The power supply cord and plug must be replaced with a genuine replacement part available from
Solahart. Phone your nearest Solahart Dealer to arrange for an inspection.
Warning: For continued safety of this water heater it must be installed, operated and maintained in
accordance with the Owner‟s Guide and Installation Instructions.
The Solahart warranty may not cover faults if relief valves or other safety devices are tampered with
or if the installation is not in accordance with these instructions.
Do not store flammable or combustible materials near
the water heater. Flammable liquids (such as petrol),
newspapers and similar articles must be kept well away
from the water heater and the flue terminal.
Do not use aerosols, stain removers and household
chemicals near the water heater whilst it is working. Gases
from some aerosol sprays, stain removers and household
chemicals become corrosive when drawn into a flame.
Do not store swimming pool chemicals, household
cleaners, etc., near the water heater.
Do not place anything on top of the water heater or in
contact with the flue terminal. Ensure the flue terminal is not
obstructed in any way at any time.
Do not use Propane / Butane gas mixtures in a Propane model. A Propane model is designed to operate
on Propane only. The use of Propane / Butane mixture, such as automotive LPG fuel, in a Propane
model is unsafe and can cause damage to the water heater.
PRECAUTIONS
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed over 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.
The water heater must be maintained in accordance with the Owner‟s Guide and Installation Instructions.
Refer to “General Maintenance” on page 7, “Minor Six Month Maintenance” on page 7 and “Major Five Year
Service” on page 7.
If this water heater is to be used where an uninterrupted hot water supply is necessary for your application or
business you should ensure that you have back up redundancy within the hot water system design. This
should ensure the continuity of hot water supply in the event that this water heater were to become
inoperable for any reason. We recommend you seek advice from your plumber or specifier about your needs
and building back up redundancy into your hot water supply system.

ABOUT YOUR WATER HEATER
7
GENERAL MAINTENANCE
The jacket of the water heater can be cleaned with a soft cloth and warm mild soapy water. Under no
circumstances should abrasive materials or powders be used.
The area around the water heater can be sprayed with insecticide to rid the area of insects. Insects
encroaching into or nesting in the water heater can interfere with the operation of the water heater and also
damage components.
MINOR SIX MONTH MAINTENANCE
It is recommended minor maintenance be performed every six months by the dwelling occupant.
The minor maintenance includes:
Inspect around the air inlet, flue terminal and the water heater in general for plant growth.
Trim back any shrubs, bushes or other plants which have encroached around the water heater.
Plant growth across the air inlet and flue terminal can interfere with the performance of the water
heater.
Inspect around the water heater for insect infestations, such as ants.
Spray insecticide around the water heater if necessary to rid the area of insects. Do not spray the
surface or into the air inlet or flue terminal of the water heater.
Insects encroaching into or nesting in the water heater can interfere with the operation of the water
heater and also damage components.
Check the drain line from the safe tray (if one is installed) is not blocked.
MAJOR FIVE YEAR SERVICE
For safe and efficient operation, it is recommended a five year service be conducted on the water heater.
Warning: Servicing of a water heater must only be carried out by qualified personnel. Phone your nearest
Solahart Dealer.
Note: The five year service and routine replacement of any components, if required, are not included in the
Solahart warranty. A charge will be made for this work. Only genuine replacement parts should be used on
this water heater.
The five year service includes the following actions:
Check and if necessary adjust the gas pressure.
Check the operation of and clean the burner.
Visually check the unit for any potential problems.
Inspect all connections.
Check the drain line from the safe tray (if one is installed) is not blocked.

ABOUT YOUR WATER HEATER
8
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
This model continuous flow water heater can be installed as part of a circulated hot water flow and return
system in a building. Refer to “Circulated Hot Water Flow and Return System” on page 19 for further
information and notes on this type of installation.
TO TURN OFF THE WATER HEATER
If it is necessary to turn off the water heater:
Switch off the electrical supply at the power outlet to the water heater if there is no risk of freezing
conditions occurring (refer to note below).
Close the gas isolation valve at the inlet to the water heater.
Close the solar heated water isolation valve at the inlet to the water heater.
Note: If there is a risk of freezing conditions, the electrical supply to the water heater should not be switched
off unless the water heater is drained, otherwise damage could result (refer to “Frost Protection”on page 8
and “Draining the Water Heater”on page 9).
TO TURN ON THE WATER HEATER
Screw in the drain plugs at the solar heated water inlet and hot water outlet of the water heater if the
water heater has been drained.
Open all of the hot taps in the house (don‟t forget the shower).
Open the cold water isolation valve fully at the inlet to the solar water heater.
Open the solar heated water isolation valve fully at the inlet to the in-series gas booster.
Air will be forced out of the taps.
Close each tap as water flows freely from it.
Open the gas isolation valve fully at the inlet to the water heater.
Plug in the power supply cord at the power outlet.
Switch on the electrical supply at the power outlet to the water heater.
The water heater will operate automatically when you open a hot tap if boosting is required.
GOING ON HOLIDAYS
If you are going on holidays, it is not necessary to turn the water heater off. If it is necessary to turn off the
water heater, refer to “To Turn Off The Water Heater” on page 8.
FROST PROTECTION
The in-series gas booster has a frost protection system. The frost protection system will protect the in-series
gas booster from damage, by preventing ice forming in the waterways of the in-series gas booster, in the
event of freezing conditions occurring.
Notes:
The frost protection system will be rendered inoperable if electrical power is not available at the water
heater. Damage caused by freezing due to the unavailability of power at the water heater is not covered
by the Solahart warranty (refer to “Terms of the Solahart Warranty” on page 37).
If it is necessary to switch the power off to the water heater and there is a risk of freezing, then it is
necessary to drain the water heater (refer to “Draining the Water Heater” on page 9).
Pipe work to and from the water heater must be adequately insulated to prevent freezing.
The water heater is not suitable for installation in areas where the ambient temperature falls below -20°C
(including wind chill factor).
Refer to “Terms of the Solahart Warranty” on page 37.

ABOUT YOUR WATER HEATER
9
DRAINING THE WATER HEATER
Turn off the water heater (refer to “Turn Off The Water Heater” on page 8).
Open a hot tap (preferably the shower outlet).
Unscrew the two drain plugs, one each at the solar heated water inlet and hot water outlet, on the
underside of the water heater.
Water will drain from the water heater.
When water stops flowing from the water heater, close the hot tap.
Note: It is recommended not to screw the drain plugs back in, until the water heater is to be turned on again.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on pages 14 to 22. The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS 5601 or AS/NZS 5601.1, as applicable under local
regulations, and all local codes and regulatory authority requirements.
Warning: Temperature controllers must not be fitted to this water heater as part of a solar water heater
system because water at a temperature much higher than the controller setting can be delivered.
The pipe work between the solar storage tank and the in-series gas booster has a minimum recommended
pipe size of DN20, MUST BE of copper and be fully insulated in accordance with the requirements of
AS/NZS 3500.4. The insulation must be weatherproof and UV resistant if exposed. The insulation must be
fitted up to the connections on both the solar storage tank and the in-series gas booster.
VICTORIAN CUSTOMERS
Notice to Victorian Customers from the Victorian Plumbing Industry Commission. This water heater must be
installed by a licensed person as required by the Victorian Building Act 1993.
Only a licensed person will give you a Compliance Certificate, showing that the work complies with all the
relevant Standards. Only a licensed person will have insurance protecting their workmanship for 6 years.
Make sure you use a licensed person to install this water heater and ask for your Compliance Certificate.
DOES THE WATER CHEMISTRY AFFECT THE WATER HEATER?
The water heater is suitable for most public water supplies, however some water chemistries may have
detrimental effects on the water heater, its components and fittings. Refer to “Water Supplies” on page 10.
If you are in a known harsh water area or you are not sure of your water chemistry, have your water checked
against the conditions described on page 10.
HOW LONG WILL THE WATER HEATER LAST?
The water heater is supported by a manufacturer‟s warranty (refer to page 37). There are a number of
factors that will affect the length of service the water heater will provide. These include but are not limited to
the water chemistry, the water pressure, the water temperature (inlet and outlet) and the water usage
pattern. Refer to “Precautions” on page 6.

10
WATER SUPPLIES
This water heater must be installed in accordance with this advice to be covered by the Solahart
warranty.
This water heater is manufactured to suit the water conditions of most public reticulated water supplies.
However, there are some known water chemistries which can have detrimental effects on the water heater
and its operation and / or life expectancy. If you are unsure of your water chemistry, you may be able to
obtain information from your local water supply authority. This water heater should only be connected to a
water supply which complies with these guidelines for the Solahart warranty to apply.
CHANGE OF WATER SUPPLY
The changing or alternating from one water supply to another can have a detrimental effect on the operation
and / or life expectation of a heat exchanger in a continuous flow water heater.
Where there is a changeover from one water supply to another, e.g. a rainwater tank supply, bore water
supply, desalinated water supply, public reticulated water supply or water brought in from another supply,
then water chemistry information should be sought from the supplier or it should be tested to ensure the
water supply meets the requirements given in these guidelines for the Solahart warranty to apply.
SATURATION INDEX
The saturation index (SI) is used as a measure of the water‟s corrosive or scaling properties.
In a corrosive water supply, the water can attack copper parts and cause them to fail. Where the saturation
index is less than –1.0, the water is very corrosive and the Solahart warranty does not apply to a copper heat
exchanger in a continuous flow water heater.
In a scaling water supply calcium carbonate is deposited out of the water onto any hot metallic surface.
Where the saturation index exceeds +0.80, the Solahart warranty does not apply to a copper heat exchanger
in a continuous flow water heater.
Water which is scaling may be treated with a water softening device to reduce the saturation index of the
water.
Refer to the Saturation Index chart on page 10.
-1.0
no warranty applies to a:
-continuous flow copper heat exchanger
SATURATION INDEX (SI)
GAS CONTINUOUS FLOW WATER HEATERS
WITHIN WARRANTY
SPECIFICATION
SATURATION INDEX
(calculated @ 80°C water temperature)
no warranty applies to a:
-continuous flow copper heat exchanger
+0.4 +0.80
very corrosive very scaling
scaling
corrosive

11
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition or
fault, which is not related to manufacture or failure of a part (refer to “Terms of the Solahart Warranty” on
page 37).
COLD WATER FROM THE HOT TAP
Close the hot tap, wait 10 seconds and open the hot tap again.
Is the hot tap open enough?
The burners will not light if the flow rate is less than 2.5 L / min
(20L models) or 2.0 L / min (27L models).
Is the water heater plugged in and the power outlet switched
on?
Is power available in the house?
Try using another electrical appliance.
Is the isolation valve in the gas line open?
Is there a gas supply to the rest of the house?
Try lighting another gas appliance.
Has the gas line been purged of air after installation?
Refer to your plumber.
REDUCED HOT WATER FLOW WHEN HEAT EXCHANGER IS COLD
At a cold start-up, i.e. when the water heater has not operated for some time (which is most often first thing
in the morning), the initial flow of hot water may be reduced for a period of 5-10 seconds while the heat
exchanger warms up. This is both an energy and water saving feature of this water heater. Once the
heat exchanger has warmed up the hot water flow will increase and remain at normal flow levels. This
feature will only occur at a cold start-up and not when the heat exchanger is already warm from a recent use
of hot water.
NO WATER FROM THE HOT TAP
No flow of water from the hot tap may indicate a restriction in or failure of the cold water supply to the water
heater. Check for water flow at other taps and that the cold water isolation valve (refer to page 23)is fully
open.
WATER FLOW FLUCTUATES
More than one or two hot taps (20 litre models) or more than two or three taps (27 litre models) in use at the
same time may cause a decrease in the hot water flow from the taps. This can be evident if the water heater
has been installed as an in-series gas booster to a solar water heater and the solar heated water is at a low
temperature.
Are there more than one or two hot taps (20 litre models) or more than two or three taps (27 litre
models) open, or are appliances such as a dishwasher or washing machine, in use at the same time?
Ensure only one or two hot taps or appliances (20 litre models) or only two or three taps or appliances
(27 litre models) are on at the one time.
Check the flow of the water from one tap, e.g. the shower.
The shower should be adjusted so the hot tap is fully open.

SAVE A SERVICE CALL
12
GAS BOOSTER OPERATING TOO FREQUENTLY
You may find that the in-series gas booster operates more frequently than expected. This will occur when the
solar heated water temperature is lower than 58°C, which may be experienced during periods of low solar
energy gain or if there has been heavy hot water usage. Factors to consider are:
Hot tap not used recently
If a hot tap has not been used for a while, the water in the pipe work between the solar storage tank and
the in-series gas booster may have cooled down. The in-series gas booster will sense the cooler water
and this will cause the burners on the water heater to ignite and boost the water temperature when a hot
tap is first turned on. The burners will extinguish when solar heated water of 58°C or higher from the
solar storage tank reaches the in-series gas booster (refer also to “Fan Continues to Run after Water
Heater Operation Stops” on page 12).
Insufficient sunlight
Insufficient sunlight due to cloudy weather during hotter months or low solar energy contribution in
colder months may mean the in-series gas booster operates more often.
Collectors shaded
If trees or other objects shade the solar collectors or if the glass is dirty, the effectiveness of the solar
collectors will be greatly reduced. Have the trees trimmed or the solar collectors relocated if the
obstruction is permanent or clean the collector glass.
Ensure the glass on your solar collectors is free of dust, salt spray or any other matter, which may
reduce the effectiveness of the solar collectors. If the collector glass becomes dirty, hose down or if the
solar collectors are accessible, wash the collector glass with water and a soft brush when the solar
collectors are cool.
Collector area is too small
For most installations, the number of solar collectors recommended in Solahart literature has been
proven to provide the required solar energy to meet the average family needs. However, in some
circumstances, it may be necessary to install an additional solar collector.
Are you using more hot water than you think?
Is one outlet (especially the shower) using more hot water than you think?
Very often it is not realised the amount of hot water used, particularly when showering. Carefully review
the family‟s hot water usage. As you have installed an energy saving appliance, energy saving should
also be practised in the home. Adjust your water usage pattern to take advantage of maximum solar
gains.
Have your plumber install a flow control valve to each shower outlet, basin and sink to reduce water
usage.
Water heater size
Do you have the correct size water heater for your requirements?
The sizing guide in the sales literature suggests average sizes that may be needed.
FAN CONTINUES TO RUN AFTER WATER HEATER OPERATION STOPS
It is the normal operation of the water heater for the fan to continue running after heating of the water is
finished. The fan may run for up to six minutes after the burners extinguish, to prepare for the next ignition.

SAVE A SERVICE CALL
13
CLOUDS OF WHITE ‘VAPOUR’ FROM THE FLUE TERMINAL
During the heating cycle, it is not unusual to see water vapour clouds
steaming from the flue terminal, particularly on cold days. This is
normal operation of the water heater.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the water heater controls.
This valve protects the water heater, by allowing water to escape, in
the event of excessive pressure build up in the waterways.
Normal operation
A small volume of water may discharge from the bottom of the
water heater when a hot tap is suddenly closed.
Continuous dribble
A continuous dribble may indicate the water supply pressure is
above the design pressure for the water heater. If so, a pressure
limiting valve must be installed on the cold water supply pipe to
the water heater (refer to “Mains Water Supply”on page 16).
ERROR CODE
The water heater provides a diagnostic error code in the event of an interruption to its operation. The error
code is displayed on the OK MONITOR on the front of the water heater as a series of flashes (20 litre
models) or as a numerical value (27 litre models). If an error code appears:
Close the hot tap and switch off the electrical supply to the water
heater.
Check the gas isolation valve at the gas inlet to the water heater is
fully open.
Wait 5 minutes, then switch on the electrical supply to the water
heater and open a hot tap.
If the error code persists, take note of the number of flashes or the
numerical code and turn off the hot tap. Phone your nearest Solahart
Dealer to arrange for inspection.
HIGHER THAN EXPECTED GAS BILLS
Should you at any time, feel your gas bill is higher than expected, we suggest you check the following points:
Is one outlet (especially the shower) using more hot water than
you think?
Carefully review the family‟s hot water usage. Inexpensive flow
control valves can be easily fitted to the shower outlets to reduce
water usage.
Is the in-series gas booster operating too frequently?
Refer to “Gas Booster Operating Too Frequently” on page 12.
Has there been an increase in hot water usage?
An increase in hot water usage may result in an increase in
booster operation.
Has your water heating tariff rate been increased by your gas retailer since your previous bill?
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
PHONE YOUR NEAREST SOLAHART DEALER.

14
INSTALLATION –WATER HEATER
THIS WATER HEATER IS FOR OUTDOOR INSTALLATION ONLY.
THIS WATER HEATER IS NOT SUITABLE FOR POOL HEATING.
Check the water heater is suitable for the gas type available.
(refer to the rating label on the water heater)
INSTALLATION STANDARDS
The water heater must be installed:
by a qualified person, and
in accordance with the installation instructions, and
in compliance with Standards AS/NZS 3500.4, AS 5601 or AS/NZS 5601.1, as applicable under local
regulations, and all local codes and regulatory authority requirements.
All packaging must be removed from the water heater prior to its installation.
WATER HEATER APPLICATION
This water heater is designed for use in a single family domestic dwelling for the purpose of heating potable
water. Its use in an application other than this may shorten its life.
If this water heater is to be used where an uninterrupted hot water supply is necessary for the application or
business, then there should be redundancy within the hot water system design. This should ensure the
continuity of hot water supply in the event that this water heater was to become inoperable for any reason.
We recommend you provide advice to the system owner about their needs and building backup redundancy
into the hot water supply system.
This water heater is suitable for use with a solar water heater with an over temperature protection system. If
the solar water heater does not have an over temperature protection system, then a solar transfer valve
should be installed.
Note:AS 3498 requires that a water heater provides the means to inhibit the growth of Legionella bacteria in
potable water. When this water heater is used as an in-series booster for a solar water heater it can satisfy
this AS 3498 requirement provided it is energised, the booster preset outlet temperature setting is 70°C or
higher, and that a remote temperature controller is not used.
The factory preset outlet temperature setting of the in-series gas booster is 60°C. The preset outlet
temperature setting can be adjusted (refer to “Preset Outlet Temperature Setting” on page 34).
WATER HEATER LOCATION
The water heater should be installed close to the most
frequently used outlet and the solar storage tank, with its
position chosen with safety and service in mind. Make sure
people (particularly children) will not touch the flue
terminal. The flue terminal and air inlet must be clear of
obstructions and shrubbery.
Clearance must be allowed for servicing of the water
heater. The water heater must be accessible without the
use of a ladder or scaffold. Make sure the entire front
panel can be removed for service. You must be able to
read the information on the rating plate. Remember you
may have to take the entire water heater out later for
servicing.
This water heater must be installed vertically upright with
the water, gas and power connections on the underside,
pointing toward the ground. The back of the water heater
can be either against a wall or supported by a frame.

INSTALLATION –WATER HEATER
15
Note: The water heater must be well secured to the wall or frame using two fasteners each at the top and
bottom of the unit (refer to pages 20 and 21 for mounting hole positions and weights of the water heaters).
Use the screws provided only if they are suitable for the wall or frame type. Otherwise select and use
alternative fasteners suitable for the application. The fasteners must be capable of bearing the full weight of
the water heater so it may not work loose nor impose any load on the gas and water pipe work connected to
the water heater. Refer to the fastener manufacturer‟s information and recommendations for the type of
fastener to use for the wall or frame type and load bearing requirements.
Alternatively the water heater can be recessed into a wall (refer to “Recess Installation” on page 16).
For a single water heater installation, refer to the typical installation diagrams on pages 22 and 22.
For a multiple water heater installation of the 27 litre models, follow the instructions on pages 25 to 26.
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 when it goes through
a flame, chemical changes take place which may attack the water heater.
A secondary flue is not required. The water heater must not be installed indoors or in a confined space.
The water heater must be located to ensure that the location of the flue terminal complies with the
requirements of AS 5601 or AS/NZS 5601.1, as applicable under local regulations. As a guide the following
requirements are extracted from the Gas Installations Standard. The distances are measured along the wall
behind the water heater.
At least 300 mm between the top of the flue terminal
and the eaves.
At least 300 mm (20 litre models) or 500 mm (27 litre
models) between the flue terminal and the edge of
any opening into the building, such as an openable
door or window, measured horizontally*.
At least 1500 mm between the top of the flue terminal
and the edge of any opening into the building, such as
an openable window, measured vertically.
At least 300 mm between the flue terminal and a
return wall or external corner, measured horizontally*.
At least 1500 mm between the flue terminal and any
opening into a building, in the direction of the flue
discharge.
At least 500 mm between the flue terminal and a fence, wall or other obstruction, in the direction of the
flue discharge.
Note: * If these horizontal distances cannot be achieved, AS/NZS 5601.1 states an equivalent horizontal
distance measured diagonally from the nearest discharge point of the flue terminal to the opening may be
deemed to comply. Check with the local regulator.
SAFE TRAY
Where damage to property can occur in the event of the water heater leaking, the water heater must be
installed over 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.
PIPE COVER
The pipe work to the water heater can be housed within a pipe cover. A pipe cover kit (PN 299838 –20 litre
models, or PN 299830 –27 litre models) is available for such an installation. Refer to the installation
instructions which accompany the pipe cover kit.
Note: The pipe cover PN 299830 for 27 litre models is available with an antique white finish only.
Clearance Requirements
Continuous Flow Gas Water Heater

INSTALLATION –WATER HEATER
16
RECESS INSTALLATION
The water heater can be installed recessed into a wall. A recess box (PN 299842 –20 litre model,
PN 299831 –27 litre model) is available for such an installation. Refer to the installation instructions which
accompany the recess box kit for information on its installation.
An additional rating label is supplied attached to the inside of the front cover of the water heater. This is for a
service person to access the water heater details when required. The rating plate on the side of the water
heater should be moved to or the information copied onto either the front panel of the water heater or to
another position which is visible when the water heater is installed so the householder can access the water
heater details when required.
FROST PROTECTION
The in-series gas booster has a frost protection system. The frost protection system will protect the in-series
gas booster from damage, by preventing ice forming in the waterways of the in-series gas booster, in the
event of freezing conditions occurring.
The frost protection system will be rendered inoperable if electrical power is not available at the water heater.
Damage to the water heater caused by freezing of the pipe work to or from the water heater is not covered
under the Solahart warranty. Refer to AS/NZS 3500.4 for precautions to be taken for installations in frost
prone areas. The water heater is not suitable for installation in areas where the ambient temperature falls
below -20°C (including wind chill factor).
The solar preheat line to the water heater must be insulated with suitable thickness insulation if freezing
conditions are likely to occur. The insulation must be fitted to the underside of the water heater and be
weatherproof and UV resistant if exposed.
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 prior to the solar storage tank. The solar storage tank may have
a lower mains supply pressure requirement, which would govern the maximum supply pressure to the
system.
Model
20, 27
Relief valve setting
1750 kPa
Max. mains supply pressure
1000 kPa
Min. mains supply pressure *
140 kPa
* minimum water supply pressure required to achieve the
rated flow and performance
Notes:
It is not recommended to install this water heater with a low pressure water supply.
A minimum water supply pressure of 140 kPa is required to achieve the rated flow and performance of
the water heater.
The maximum water supply pressure to the solar water heater, without an expansion control valve
(ECV), is generally 800 kPa, however it may be less than this for some models. Refer to the Owner‟s
Guide and Installation Instructions supplied with the solar water heater for maximum mains supply
pressure details.
If sludge or foreign matter is present in the water supply, it is recommended a suitable filter be
incorporated in the cold water line to the water heater.
This water heater is not suitable for connection to bore water or spring water unless a water treatment
device is fitted.
Refer to “Water Supplies” on page 10 for further information on water chemistry.

INSTALLATION –WATER HEATER
17
HOT WATER DELIVERY
This water heater can deliver water at temperatures which can cause scalding.
It is necessary and we recommend that a temperature limiting device be fitted between the water heater and
the hot water outlets in any ablution and public areas such as a bathroom, ensuite or public amenities, to
reduce the risk of scalding. The installing plumber may have a legal obligation to ensure the installation of
this water heater meets the delivery water temperature requirements of AS/NZS 3500.4 so that scalding
water temperatures are not delivered to a bathroom, ensuite or other ablution or public area.
The temperature limiting device used with a continuous flow gas water heater should have:
a specified „minimum temperature differential‟between the hot water inlet and the tempered water outlet
of no greater than 10°C, and
a specified „maximum permitted pressure variation‟in the supply between the hot water inlet and the
cold water inlet of no less than 15%.
Refer to the specifications of the temperature limiting device.
The temperature limiting device used with an in-series gas booster as part of a solar water heater installation
must have the additional capability of receiving a hot water supply temperature of up to 99°C if the solar
water heater does not have an over temperature protection system to limit the water to no greater than 90°C.
Warning: Temperature controllers must not be fitted to this water heater as part of a solar water heater
system because water at a temperature much higher than the controller setting can be delivered.
Where a temperature limiting device is installed adjacent to the in-series gas booster, the cold water line to
the temperature limiting device can be branched off the cold water line either before or after the isolation
valve and pressure limiting valve to the solar storage tank, but it MUST BE before the non return valve prior
to an open circuit direct system. The cold water line to the temperature limiting device can be branched off
the cold water line either before or after the non return valve prior to a closed circuit indirect system. If an
expansion control valve is required, it must always be installed after the non return valve and be the last
valve prior to the solar storage tank.
Warning: A non return valve MUST BE installed on the cold water line to the solar storage tank AFTER
the cold water branch to a temperature limiting device prior to an open circuit direct system. Due to the
higher water temperatures generated under certain conditions in the solar collectors of an open circuit direct
Streamline solar water heater, an additional effective back-flow prevention device also should be used as an
extra safeguard. Valve manufacturer RMC recommends Dual Check Valve model N7150, as being suitable
for this application.
If a combination isolation valve and non return valve (duo or trio valve) is installed on the cold water line to
an open circuit direct solar water heater and the cold water line to the temperature limiting device branches
off after this valve, then a second non return valve must be installed between the cold water branch and the
solar storage tank. Due to the higher water temperatures generated under certain conditions in the solar
collectors of an open circuit direct Streamline solar water heater, an effective back-flow prevention device
should be used as the second non return valve as an extra safeguard. Valve manufacturer RMC
recommends Dual Check Valve model N7150, as being suitable for this application.
If a pressure limiting valve is installed on the cold water line to the solar water heater and the cold water line
to a temperature limiting device branches off before this valve or from another cold water line in the
premises, then a pressure limiting valve of an equal pressure setting may be required prior to the
temperature limiting device.

INSTALLATION –WATER HEATER
18
LEGEND
LEGEND
In-series Gas Booster for Open Circuit Direct Thermosiphon Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
LEGEND
In-series Gas Booster for Open Circuit Direct Streamline Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
LEGEND
In-series Gas Booster as part of a Closed Circuit Indirect Solar Water Heater Installation
Two Temperature Zones Using a Temperature Limiting Device
to solar
storage tank
from solar
storage tank
from solar
storage tank
to solar
storage tank
from solar
storage tank
to solar
storage tank

INSTALLATION –WATER HEATER
19
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
A Solahart in-series gas booster can be installed as part of a circulated hot water flow and return system in a
building. The preset outlet temperature setting of the water heater must be set to at least 60°C, or at least
70°C to meet the requirement of AS 3498, or at least 70°C if the water temperature decreases by more than
5°C through a circulated hot water flow and return system due to heat loss in the ring main. Water should not
be circulated from a water heater with a temperature setting of less than 60°C.
The circulator must be:
sized and set to provide a minimum flow rate of 3.0 L/min through the circulated hot water flow and
return system, and
either thermostatically and / or timer controlled.
The circulator must not be set to operate continuously, i.e. 24 hours per day.
Temperature Limiting Device
A temperature limiting device cannot be installed in circulated hot water flow and return pipe work. The
tempered water from a temperature limiting device cannot be circulated. Where a circulated hot water flow
and return system is required in a building, a temperature limiting device can only be installed on a dead leg,
branching off the circulated hot water flow and return pipe.
If circulated tempered water were to be returned back to the water heater, depending on the location of the
return line connection on the water supply line to the water heater, then either:
water will be supplied to the cold water inlet of the temperature limiting device at a temperature
exceeding the maximum recommended water supply temperature, or
when the hot taps are closed no water will be supplied to the cold water inlet of the temperature limiting
device whilst hot water will continue to be supplied to the hot water inlet of the temperature limiting
device.
These conditions may result in either water at a temperature exceeding the requirements of AS/NZS 3500.4
being delivered to the hot water outlets in the ablution areas, or the device closing completely and not
delivering water at all, or the device failing. Under either condition, the operation and performance of the
device cannot be guaranteed.
LEGEND
LEGEND
Circulated Hot Water Flow and Return
In-series Gas Booster as part of a Solar Water Heater Installation
REDUCING HEAT LOSSES
The hot water line from the in-series gas booster and the pipe work between the solar storage tank and the
in-series gas booster must be insulated in accordance with the requirements of AS/NZS 3500.4. The
insulation must be weatherproof and UV resistant if exposed. The insulation must be fitted up to the
connections on the both the underside of the water heater and the solar storage tank.
from solar
storage tank

INSTALLATION –WATER HEATER
20
DIMENSIONS AND TECHNICAL DATA –20 LITRE MODELS
Model natural
propane
10143204
10143205
Rated delivery
(@ 40°C rise)
litres / min
12.5
Recovery
(@ 25°C rise)
litres / min
20
Mass Empty (unpackaged)
kg
16
Gas Details
Hourly Gas
Consumption
(MJ)
Min Gas Pressure
(kPa)
Test Point Gas Pressure (kPa)
Max Gas Pressure
(kPa)
minimum
maximum
Model
20
20
20
20
20
Natural
153
1.13
0.170
0.870
3.50
Propane
153
2.75
0.190
1.185
3.50
Model numbers: 4 = Natural, 5 = Propane.
Digit 4, 5 is included in the part number as the eighth (last) digit, e.g. 10143204, to denote gas type.
Technical data is subject to change.