Solahart 10143200 User manual

“Electronic Instantaneous”
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
This water heater must be installed and serviced by an authorised person.
Please leave this guide with the householder.

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 Industries Ltd.
Solahart Industries Pty Ltd is the supplier of the Solahart range of electronic instantaneous gas water heaters,
manufactured by Paloma Industries Ltd, a world leader in water heater technology and manufacture.
® Registered trademark of Solahart Industries Pty Ltd or Rheem Australia Pty Ltd.
™ Trademark of Solahart Industries Pty Ltd or Rheem Australia Pty Ltd.
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.
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 5to 12.
The other pages are intended for the installer but may be of interest.
Introduction................................................................................................................... 4
About Your Water Heater ............................................................................................. 5
How Your Water Heater Works.................................................................................... 9
Save A Service Call .................................................................................................... 10
Installation – Water Heater......................................................................................... 13
Connections – Plumbing............................................................................................ 23
Connections – Electrical ............................................................................................ 25
Multiple Installations .................................................................................................. 26
Commissioning........................................................................................................... 30
Draining The Water Heater......................................................................................... 34
Water Supplies............................................................................................................ 36
Warranty ...................................................................................................................... 37
Solahart Offices .......................................................................................................... 40

4
INTRODUCTION
Congratulations on choosing an “ELECTRONIC INSTANTANEOUS GAS BOOSTER” solar water
heater. We are confident that your purchase will provide you many years of trouble free hot water.
All over the world, the Solahart name is synonymous with quality in water heating. From humble
beginnings in the pioneering days of Western Australia, a reputation has been built up over nearly a
century.
In 1905, two enterprising plumbers formed the company known as S. W. Hart, a name that was
retained for over 70 years. Even in its early stages, S. W. Hart was involved in the manufacture of metal
products for water storage and water heating. Since 1953, S. W. Hart, now Solahart Industries Pty Ltd,
has been producing Thermosiphon solar hot water systems, which is well over 50 years of hot water
experience.
Solahart is the market leader in Australia and a dominant brand throughout the world. Our network of
distributors covers over 70 countries in Europe, North America, Africa and Asia. In our home market of
Australia, we offer the widest range of Thermosiphon solar water heater products, along with the
Streamline brand of active solar hot water systems and Synergy heat pump. The “ELECTRONIC
INSTANTANEOUS GAS BOOSTER” can be used in conjunction with a range of Solahart
Thermosiphon and Streamline solar hot water systems. Our product is positioned within the hot water
market as a reliable, durable product with state of the art manufacturing technology.
It is with the above in mind that we at Solahart Industries Pty Ltd are confident that your purchase of the
“ELECTRONIC INSTANTANEOUS GAS BOOSTER” solar water heater will provide you reliable hot
water with quality after sales service back up.
Thankyou

5
ABOUT YOUR WATER HEATER
MODEL TYPE
Congratulations for choosing a Solahart electronic instantaneous gas booster water heater. The 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.
This water heater has been installed as a gas booster water heater to a solar preheat 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.
HOW HOT SHOULD THE WATER BE?
The solar preheat water heater will deliver water at temperatures
up to 75°C for a Streamline pumped system and up to 85°C for a
Thermosiphon system with an over temperature protection
system. During periods of low solar energy gain, the gas booster
water heater will boost the water temperature automatically to a
minimum 60°C when required. solar gas booster
temperature setting
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. The installer has
checked and if required, adjusted the preset outlet temperature
setting to 60°C.
maximum recommended
supply temperature to
bathrooms and ensuites.
To meet the requirements of the National Plumbing Standard the
temperature setting must not be below 60°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.
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 high performance 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.
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.
This water heater uses 240 V AC electrical power for operation of the control systems and the
combustion fan. The removal of the front cover(s) will expose 240 V wiring. It must only be removed by
an authorised or 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.

ABOUT YOUR WATER HEATER
6
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 an authorised 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.
The warranty can become void 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.
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 cold 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 8and “Draining the Water Heater” on page 8).

ABOUT YOUR WATER HEATER
7
TO TURN ON THE WATER HEATER
•Screw in the drain plugs at the cold water inlet and hot water outlet of the water heater if the water
heater has been drained.
•Open all of the hot water 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 preheat water isolation valve fully at the inlet to the booster water heater.
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.
HOW DO I KNOW IF THE WATER HEATER IS INSTALLED CORRECTLY?
Installation requirements are shown on page 21. The water heater must be installed by an authorised
person. In Australia, the installation must comply with Standards AS/NZS 3500.4 and AS 5601 and all
local codes and regulatory authority requirements. In New Zealand the installation must conform with
NZS 5261 Code of Practice for Installation of Gas Burning Appliances and the New Zealand Building
Code.
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 gas booster water heater 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 gas booster water
heater.
DOES THE WATER QUALITY AFFECT THE WATER HEATER?
The water heater is suitable for most public water supplies, however some water qualities may have
detrimental effects on the heat exchanger and fittings. If you are in a known harsh water area you
must read page 36.If you are not sure, have your water quality checked against the conditions
described on page 36.
HOW LONG WILL THE WATER HEATER LAST?
There are a number of factors that will affect the length of service the water heater will provide. These
include the water quality, the water pressure, temperature (inlet and outlet) and the water usage
pattern. However, your water heater is supported by a comprehensive warranty (refer to page 38).

ABOUT YOUR WATER HEATER
8
FROST PROTECTION
The gas booster water heater has a frost protection system. The frost protection system will protect the
gas booster water heater from damage, by preventing ice forming in the waterways of the gas booster
water heater, 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 warranty (refer to “Warranty Exclusions” 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 8).
•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
-20ºC (including wind chill factor).
•Refer to
“Warranty Exclusions” on page 37.
DRAINING THE WATER HEATER
•Turn off the water heater (refer to “Turn Off The Water Heater” on page 6).
•Open a hot tap (preferably the shower outlet).
•Unscrew the two drain plugs, one each at the cold 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.
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 6.

9
HOW YOUR WATER HEATER WORKS
GAS BOOSTING FOR A SOLAR WATER HEATER
Water stored in the solar storage tank passes through the gas booster water heater when a hot tap is
opened. The gas booster water heater is for heating water at times of low solar energy gain, such as
during cloudy or rainy weather, or during winter months.
This water heater is not suitable for use with a solar water heater without an over temperature
protection system. Solar heated water can reach temperatures up to 75°C for a Streamline pumped
system or up to 85°C for a Thermosiphon system with an over temperature protection system. The gas
booster water heater operates automatically. When the solar heated water temperature is above 58°C,
the flow passes through the gas booster water heater without boosting. When the solar heated water
temperature is below 58°C, the gas booster water heater heats the water to a minimum temperature of
60°C.
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 a minimum temperature of 60°C 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.
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 15, 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.
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.
SERVICING
For safe and efficient operation, the water heater should be
serviced annually by your nearest Solahart Dealer. Only genuine
replacement parts should be used on this water heater.
Warning: Servicing of a gas water heater should only be
carried out by authorised personnel.

10
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 “Warranty” on page 38).
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
3 L / min.
•Is the power supply cord is 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.
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)are fully open.
WATER FLOW FLUCTUATES
More than two or three hot taps in use at the same time may cause a decrease in the hot water flow
from the taps if the gas booster water heater is operating and the solar preheat water is at a low
temperature.
•Are there more than two or three hot taps open, or are appliances such as a dishwasher or
washing machine, in use at the same time?
Ensure only two or three hot taps (or appliance) are on at the one time.
•Check the flow of the water from one tap, eg, the shower.
The shower should be adjusted so the hot tap is fully open.

SAVE A SERVICE CALL
11
GAS BOOSTER OPERATING TOO FREQUENTLY
You may find that the gas booster water heater operates more frequently than expected. This will occur
when the solar preheat 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 used recently
If a hot tap has not been used for a while, the water in the pipe work between the solar water
heater and the gas booster water heater may have cooled down. The water heater 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 preheated
water above 58°C from the solar storage tank reaches the water heater (refer to “Fan Continues to
Run after Water Heater Operation Stops” on page 11).
•Insufficient sunlight
Insufficient sunlight due to cloudy weather during summer months or low solar energy contribution
in winter months may mean the 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 and on the Solahart website (www.solahart.com.au) 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
12
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 15).
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 front of the water heater on the OK MONITOR. If an error code appears:
•Close the hot tap and switch off the electrical supply to the
water heater.
•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 code and turn off the
hot tap. Phone your nearest Solahart Dealer to arrange for
inspection.
HIGH GAS BILLS
Should you at any time, feel your gas account is too high, 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.
•Consider recent changes to your hot water usage pattern
and check if there has been any increase in tariffs since
your previous account.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
CALL YOUR NEAREST SOLAHART DEALER.

13
INSTALLATION – WATER HEATER
THIS WATER HEATER IS FOR OUTDOOR INSTALLATION ONLY.
THIS WATER HEATER IS NOT SUITABLE FOR USE WITH A SOLAR WATER HEATER WITHOUT
AN OVER TEMPERATURE PROTECTION SYSTEM.
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)
WATER HEATER LOCATION
The water heater should be installed close to both 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. Remember you may
have to remove the entire water heater later for servicing.
You must be able to read the information on the rating
plate.
The installation must comply with these installation
instructions and with the requirements of AS/NZS 3500.4,
AS 5601 and all local codes and regulatory authority
requirements. In New Zealand the installation must
conform with NZS 5261 Code of Practice for Installation of
Gas Burning Appliances and the New Zealand Building
Code.
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.
For a single water heater installation, follow the diagrams on pages 21 and 22. For a multiple water
heater installation, follow the instructions on pages 26 to 29.
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. The water heater must be secured to the wall or frame using suitable mounting
screws, two each at the top and bottom of the unit (refer to page 20 for mounting hole positions).
Alternatively the water heater can be recessed into a wall (refer to “Recess Installation” on page 14). A
secondary flue is not required. The water heater must not be installed indoors or in a confined space.

INSTALLATION – WATER HEATER
14
As a guide the following requirements extracted from the Australian Gas Installations Standard
AS 5601, must be observed.
•At least 300 mm between the top of the water heater
and the eaves.
•At least 300 mm between the water heater and the
edge of any opening into the building, measured
horizontally along the wall.
•At least 300 mm between the water heater and a
return wall or external corner, measured horizontally
along the wall.
•At least 1500 mm below any openable window.
•At least 1500 mm between the water heater and any
opening into a building, in the direction of the flue
discharge.
•At least 500 mm between the water heater and a fence, wall or other obstruction, in the direction of
the flue discharge.
PIPE COVER
The pipe work to the water heater can be housed in a pipe cover housing. A pipe cover kit (PN 299848)
is available for such an installation. Refer to the installation instructions which accompany the pipe
cover kit.
RECESS INSTALLATION
The water heater can be installed recessed into a wall. A recess box (PN 299849) is available for such
an installation. The rating plate on the side of the water heater must 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. Refer to the installation instructions which accompany the recess box kit for
information on its installation.
FROST PROTECTION
The gas booster water heater has a frost protection system. The frost protection system will protect the
gas booster water heater from damage, by preventing ice forming in the waterways of the gas booster
water heater, 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 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 -20ºC (including wind chill factor).
The solar preheat water line to the water heater, where exposed, must be insulated where there is a
risk of freezing conditions occurring. The insulation must be fitted to the underside of the water heater
and be weatherproof and UV resistant.

INSTALLATION – WATER HEATER
15
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, 24, 26
Relief valve setting 1750 kPa
Max. mains supply pressure 1000 kPa
Min. mains supply pressure 140 kPa
Notes:
•The maximum water supply pressure to the solar preheat water heater, without an expansion
control valve (ECV), is generally 800 kPa. Refer to the Owner’s Guide and Installation Instructions
supplied with the solar water heater for maximum mains supply pressure details.
•A minimum water supply pressure of 140 kPa is required to achieve the rated flow and
performance of the water heater.
•It is not recommended to install this water heater with a low pressure water supply.
•This water heater is not suitable for connection to bore water or spring water unless a water
treatment device is fitted.
•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.
•Refer to
“Water Supplies” on page 36.

INSTALLATION – WATER HEATER
16
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 solar water heater should have a specified minimum
temperature differential, i.e. between the hot water inlet and the tempered water outlet, of no greater
than 10°C. In addition, a temperature limiting device capable of receiving a hot water supply
temperature of up to 99°C should be used in conjunction with a Solahart thermosiphon closed circuit
system installed without a HartStat over temperature protection system or a Solahart thermosiphon
open circuit system.
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 gas booster water heater, 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
17
from solar
storage tank
to solar
storage tank
Gas Booster for Open Circuit Direct Thermosiphon Solar Preheater Installation
Two Temperature Zones Using a Temperature Limiting Device
to solar
storage tank
from solar
storage tank
Gas Booster for Open Circuit Direct Streamline Solar Preheater Installation
Two Temperature Zones Using a Temperature Limiting Device
from solar
storage tank
to solar
storage tank
Gas Booster for Closed Circuit Thermosiphon and Streamline Solar Preheater Installation
Two Temperature Zones Using a Temperature Limiting Device

INSTALLATION – WATER HEATER
18
CIRCULATED HOT WATER FLOW AND RETURN SYSTEM
A Solahart gas booster water heater cannot be installed as part of a circulated hot water flow and return
system in a building.
If a circulated flow and return system is required, it is necessary to bypass the gas booster water heater
and install a secondary water heater connected to the hot water flow and return line and supplied from
the gas booster water heater. The secondary water heater must be a storage water heater able to
provide a hot water outlet temperature of at least 60°C. Note: The thermostat must always be set to at
least 60°C.
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.
from
solar
storage
tank
Gas Booster for Solar Preheater Installation
Circulated Hot Water Flow and Return System

INSTALLATION – WATER HEATER
19
REDUCING HEAT LOSSES
The hot water line from the gas booster water heater and the pipe work between the solar storage tank
and the gas booster water heater 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 both the underside of the gas booster water heater and the solar
storage tank.

INSTALLATION – WATER HEATER
20
DIMENSIONS AND TECHNICAL DATA
Australian models natural 10143200 10143240 10143260 New Zealand models natural 10143265
propane 10143201 10143241 10143261 LPG 10143266
Rated delivery @ 40°C rise
natural gas
propane
L/min
L/min
12.5
12.5
15
15
16
16
Rated delivery @ 40°C rise
natural gas
universal LPG
L/min
L/min
16
16
Recovery @ 25°C rise
natural gas
propane
L/min
L/min
20
20
24
24
26
26
Recovery @ 25°C rise
natural gas
universal LPG
L/min
L/min
26
26
Mass empty
kg 20 21 21
Mass empty
kg 21
Note: Models 10143265 (natural) and 10143266 (universal LPG) are suitable for New Zealand only
Gas Details Test Point Gas Pressure (kPa)
Hourly Gas
Consumption
(MJ)
Min Gas
Pressure
(kPa) minimum maximum
Max Gas
Pressure
(kPa)
20 24 26 20 to 26 20 24 26 20 24 26 20 to 26
Natural 157 188 199 1.13 0.182 0.17 0.17 0.903 0.912 0.965 3.50
Propane 157 188 199 2.75 0.32 0.22 0.22 1.50 1.078 1.20 3.50
Universal LPG - - 199 2.75 - - 0.22 - - 1.10 3.50
Model numbers: 0 = Natural, 1 = Propane. Digit 0, 1 is included in the part number as the eighth (last) digit, eg
10143240, to denote gas type.
Specifications are subject to change with ongoing product improvements.