Solahart GAS BOOSTED SOLAR WATER HEATER Installation instructions

This water heater must be installed and serviced by an authorised person.
Please leave this guide with the householder.
“Streamline Closed Circuit”
GAS BOOSTED
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.
Solahart Industries Pty Ltd
ABN 45 064 945 848

PATENTS
This water heater may be protected by one or more patents or registered designs.
® 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: Plumber – Be Aware
•The solar hot and solar cold pipes between the solar storage tank and the
solar collectors MUST BE of copper and fully insulated with closed cell
polymer insulation or similar (minimum thickness 13 mm). The insulation must
be weatherproof and UV resistant if exposed. All compression fittings must
use brass or copper olives.
•Plastic pipe MUST NOT be used, as it will not withstand the temperature of
the closed circuit fluid generated by the solar collectors under stagnation
conditions. The solar collectors can generate extremely high closed circuit
fluid temperatures of up to 150°C. Plastic pipe cannot withstand these
temperatures and MUST NOT be used. Failure of plastic pipe can lead to the
release of high temperature closed circuit fluid and cause severe water
damage and flooding. Refer to Warning on page 28.
Warning: Upon completion of the installation and commissioning of the water heater, leave this
guide with the householder or 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 5 to 16.
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.................................................................................. 10
Regular Care ............................................................................................................... 12
Save A Service Call .................................................................................................... 13
Installation – Solar Storage Tank .............................................................................. 17
Installation – Solar Collectors ................................................................................... 26
Connections – Plumbing............................................................................................ 29
Connections – Electrical ............................................................................................ 33
Commissioning........................................................................................................... 35
Draining The Water Heater......................................................................................... 51
Water Supplies............................................................................................................ 52
Warranty ...................................................................................................................... 53
Solahart Offices .......................................................................................................... 56

4
INTRODUCTION
Congratulations on choosing a “STREAMLINE CLOSED CIRCUIT GAS BOOSTED” 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 thermosyphon solar hot water systems, which is well over 40 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 thermosyphon solar water heater products, and we are now
releasing the “STREAMLINE CLOSED CIRCUIT GAS BOOSTED” active solar hot water system. 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
“STREAMLINE CLOSED CIRCUIT GAS BOOSTED” 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®water heater. Your Solahart Streamline closed circuit solar
water heater is designed for the solar collectors to be roof mounted and the solar storage tank to be
installed at ground or floor level. The solar storage tank is suitable for outdoor installation only and with
either Solahart ‘J’ or ‘KF’ solar collectors. The system is suitable for installation in areas subject to frost
or freeze conditions. Freeze conditions occur below 6°C.
HOW HOT SHOULD THE WATER BE?
The solar control unit will circulate the closed circuit fluid through
the solar collectors until a temperature of approximately 75°C is
reached in the solar storage tank. During periods of low solar
energy gain, the gas booster will boost the water temperature
automatically to a minimum 60°C when required.
Note: The preset outlet booster temperature setting of the gas
booster cannot be adjusted by the householder. The setting can
only be adjusted by your nearest Solahart Dealer. The preset
outlet booster temperature setting of the gas booster is 60°C.
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 also be required by regulations that an approved temperature limiting
device be fitted into the hot water pipe work 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.
This water heater has two outlets. One is a hot water outlet and the other is a tempered water outlet.
The purpose of the hot water outlet is to deliver hot water at between 60°C and 75°C, usually for
kitchen and laundry use. The purpose of the tempered water outlet is to deliver water up to 50°C,
usually for bathroom or ensuite use.
WARNING
This water heater is not intended to be operated, adjusted or tampered with by young children or infirm
persons. Young children should be supervised to ensure they do not interfere with the water heater.
The water heater uses 240 V AC electrical power for operation of the control systems and the
electrically operated components. The removal of the front covers will expose 240 V wiring. They 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.
Care should be taken not to touch the pipe work connecting the solar storage tank and the solar
collectors. Very high temperature closed circuit fluid can be generated by the solar collectors under
certain conditions and flow through the pipe work from the solar collectors to the solar storage tank.
typical maximum
temperature from solar
gain
maximum recommended
supply temperature to
bathrooms and ensuites
booster setting and
minimum recommended
stored water temperature

ABOUT YOUR WATER HEATER
6
SAFETY
This water heater is supplied with temperature sensors, a FlameSafe™ protection system, pressure
relief valves and a combination temperature 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 to the solar storage tank 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 you plan to be away from home for a few nights, we suggest you leave the water heater switched on.
If it is necessary to turn off the water heater:
•Switch off the electrical supply at the power outlet to the solar storage tank 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 gas booster is drained, otherwise damage could result (refer to “Freeze
Protection” on page 8 and “Draining the Gas Booster Water Heater” on page 9).

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 gas booster if the gas
booster has been drained.
•Open the cold water isolation valve fully at the inlet to the water heater.
•Open all of the hot water taps in the house (don’t forget the shower).
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 water heater at the power outlet and switch on the electrical supply.
The power outlet must be switched on for the solar controls to operate and solar gain to be
achieved and for the gas booster to operate.
The gas booster 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 25. The water heater must be installed by an authorised
person and the installation must comply with National Standards AS/NZS 3500.4, AS 5601,
AS/NZS 3000 and all local codes and regulatory authority requirements. In New Zealand, the
installation must conform with the New Zealand Building Code.
Temperature controllers must not be fitted (refer to warning under “How Hot Should The Water Be?”
on page 5).
PIPE WORK AND INSULATION
The solar hot and solar cold pipe work between the solar storage tank and the solar collectors
MUST BE of copper and fully insulated with closed cell polymer insulation or similar (minimum
thickness 13 mm). The insulation must be weatherproof and UV resistant if exposed. The insulation will
offer corrosion protection to a metal roof against water runoff over the copper pipe, assist in avoiding
accidental contact with the solar pipe work and also reduce pipe heat losses.
The insulation must be fitted up to the connections on both the solar collectors and the solar storage
tank, as very high temperature closed circuit fluid can flow from the solar collectors to the solar storage
tank under certain conditions.
There must be a continuous fall in the pipe work from the solar collectors to the solar storage tank. The
continuous fall is essential to assist in the drain back function of the solar system.
Plastic pipe MUST NOT be used, as it will not withstand the temperature of the closed circuit fluid
generated by the solar collectors under certain conditions (refer to Warning on page 28).
RAIN WATER TANK
If the solar collectors and solar pipe work are installed on a section of roof which is part of a rain water
runoff collection system, then it is recommended this section of roof and its gutter be isolated from the
rain water collection system. The gutter should be isolated to a width greater than the solar collectors
and pipe work and must have suitable drainage. This is to ensure in the event of a leak from the solar
collectors or pipe work, a rainwater tank cannot be contaminated with closed circuit fluid.
The closed circuit fluid contains food grade additives (rust inhibitor and anti-freeze agent), is non-toxic
and is harmless to the environment. However, if it enters a rain water tank, it can kill off microscopic
algae which are typically present in the water causing an unpleasant odour to develop and resulting in
the rain water tank having to be drained and cleaned.

ABOUT YOUR WATER HEATER
8
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 cylinder, gas booster heat exchanger and fittings. If you are in a known
harsh water area you must read page 52. If you are not sure, have your water quality checked
against the conditions described on page 52.
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 Solahart water heater is supported by a comprehensive warranty (refer to
page 54).
ANODE PROTECTION
The anode(s) installed in your water heater will slowly dissipate whilst protecting the cylinder. The life of
the water heater cylinder may be extended by arranging for an authorised person to inspect the
anode(s) and replace if required.
The suggested time after installation when the anode(s) should be inspected is 8 years.
For softened water supplies or in areas of poor water quality, it is recommended the anode(s) be
inspected 3 years earlier than shown (refer to “Water Supplies” on page 52).
FREEZE PROTECTION
Solar Circuit
The solar circuit must be installed with a continuous fall in the pipe work from the solar collectors to the
solar storage tank, the solar hot and solar cold pipes must be fully insulated with closed cell polymer
insulation (minimum thickness 13 mm) and the system charged with correctly mixed closed circuit fluid
to offer protection against freeze damage. The system has NO WARRANTY for freeze damage if there
is not a continuous fall in the solar hot and solar cold pipes, or they are uninsulated, or the closed circuit
fluid has been incorrectly mixed (refer to “Warranty Exclusions” on page 53).
The anti freeze control of the solar circuit is designed so there is no closed circuit fluid in the solar
collectors or solar cold and solar hot pipes when the pump is off.
Gas Booster Water Heater
The gas booster has a frost protection system. The frost protection system will protect the gas booster
from damage, by preventing ice forming in the waterways of the gas booster, in the event of freezing
conditions occurring.
Notes:
•The gas booster 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 53).
•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 gas booster (refer to “Draining the Gas Booster 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 -
20ºC (including wind chill factor).
•Refer to “Warranty Exclusions” on page 53.

ABOUT YOUR WATER HEATER
9
DRAINING THE GAS BOOSTER 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.

10
HOW YOUR WATER HEATER WORKS
SOLAR OPERATION
The Solahart Streamline closed circuit solar water heater has its vitreous enamel lined solar storage
tank installed at ground or floor level, remotely from the solar collectors. This water heater is an indirect
solar hot water system with a heat exchanger in the solar storage tank. The heat exchanger is filled with
closed circuit fluid and is connected to the solar collectors forming a closed circuit.
As the sun heats the solar collectors, the increase in temperature activates the pump. The pump
switches on whenever the solar collectors are hotter than the water in the tank. The pump moves the
closed circuit fluid from the solar storage tank heat exchanger through an insulated copper pipe to the
solar collectors to be heated by the sun’s energy and then back to the heat exchanger. Heat transfers
from the closed circuit fluid in the heat exchanger to the water stored in the solar storage tank.
This process continues while solar energy is available and until the water in the solar storage tank
reaches a temperature of approximately 75°C. The pump is then deactivated and the closed circuit fluid
in the solar collectors and solar pipe work drains back into the heat exchanger in the solar storage tank.
The closed circuit provides protection to the solar collectors and solar circuit in harsh water areas. The
drain back principle provides protection to the system in freezing conditions.
Automatic safety controls are fitted to the water heater to provide safe and efficient operation.
GAS BOOSTING OPERATION
Water stored in the solar storage tank passes through the gas
booster when a hot tap is opened. The gas booster is for heating
the water at times of low solar energy gain, such as during cloudy
or rainy weather, or during winter months.
Solar heated water can reach temperatures up to 75°C in the solar
storage tank. When the solar heated water temperature is above
58°C, the gas booster will not boost the water temperature.
The gas booster operates automatically if heating of the water is
required. When 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. 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.
WATER OUTLET TEMPERATURE
This water heater has two outlets. One is a hot water outlet and the other is a tempered water outlet.
The purpose of the hot water outlet is to deliver hot water at between 60°C and 75°C, usually for
kitchen and laundry use. The purpose of the tempered water outlet is to deliver water up to 50°C,
usually for bathroom or ensuite use.
The tempered water outlet is from the tempering valve, located under the pipe cover at the front of the
water heater immediately below the gas booster. The tempering valve is the brass valve with a green
plastic cap. The tempering valve mixes hot water from the solar storage tank and gas booster with cold
water from the mains supply and delivers tempered water from its outlet.
The hot water outlet is located above the tempering valve. Depending upon how the water heater was
installed, either both or only one of these outlets may have been plumbed to the hot water pipe work in
the premises.

HOW YOUR WATER HEATER WORKS
11
MAINS PRESSURE
The water heater is designed to operate at mains pressure by connecting directly to the mains water
supply. If the mains supply pressure in your area exceeds that shown on page 19, a pressure limiting
valve must be fitted. The supply pressure should be greater than 350 kPa for true mains pressure
operation to be achieved. The supply pressure should be greater than 140 kPa for the rated flow and
performance of the gas booster to be achieved.
GOING ON HOLIDAYS
It is not necessary to switch off the electrical supply at the power outlet to the water heater if you are
going away. However, if it is necessary to switch off the power to the water heater, refer to “To Turn Off
The Water Heater” on page 6. If the power to the water heater is switched off and there is a risk of
freezing, then it is necessary to drain the gas booster (refer to “Draining the Gas Booster Water Heater”
on page 9)

12
REGULAR CARE
TEMPERATURE PRESSURE RELIEF VALVE
This valve is near the top of the water heater and is essential for its safe operation. It is possible for the
valve to release a little water through the drain line during each heating period. This occurs as the water
is heated and expands by approximately 1/50 of its volume.
Continuous leakage of water from the valve and its drain line may indicate a problem with the water
heater (refer to “Temperature Pressure Relief Valve Running” on page 15).
WARNING: Never block the outlet of this valve or its drain line for any reason.
Operate the easing lever on the temperature pressure relief
valve once every six months. It is very important you raise
and lower the lever gently.
WARNING: Failure to do this may result in the water heater
cylinder failing.
If water does not flow freely from the drain line when the lever is
lifted, then the water heater should be checked by your nearest
Solahart Dealer.
The temperature pressure relief valve should be checked for
performance or replaced at intervals not exceeding 5 years, or
more frequently in areas where there is a high incidence of water
deposits (refer to “Water Supplies” on page 52).
EXPANSION CONTROL VALVE
In many areas, including South Australia, Western Australia and
scaling water areas, an expansion control valve is fitted to the
cold water line to the water heater. Water will flow from its drain
line during the heating period.
Operate the easing lever on the expansion control valve once
every six months. It is very important you raise and lower the
lever gently. The expansion control valve should be checked for
performance or replaced at intervals not exceeding 5 years, or
more frequently in areas where there is a high incidence of water
deposits.
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. Have any trees trimmed which may shade the solar collectors.
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 the water heater should only be carried out by authorised personnel.
water
heater
drain
line
lift until water
flows from the
drain line –
lower gently

13
SAVE A SERVICE CALL
Check the items below before making a service call. You will be charged for attending to any condition
or fault that is not related to manufacture or failure of a part.
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 gas booster burners will not light if the flow rate is less than
3.0 L / min.
•Solar control unit and gas booster not operating
Check the power supply cord is plugged in and the
power outlet switched on.
Is power available in the house? Try using another
electrical appliance.
•Gas supply
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 29) is fully open.
GAS BOOSTER OPERATING TOO FREQUENTLY
You may find that the gas booster 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:
•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 (refer to “Collector Glass” on page 12).
•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.

SAVE A SERVICE CALL
14
•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.
•Temperature pressure relief valve running
Is the relief valve discharging too much water? (Refer to “Temperature Pressure Relief Valve
Running” on page 15).
•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.
WATER FLOW FLUCTUATES
More than one or two hot taps in use at the same time may cause a decrease in the hot water flow from
the taps.
•Is there more than one or two hot taps 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 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
15
TEMPERATURE PRESSURE RELIEF VALVE RUNNING
•Normal Operation
It is normal and desirable this valve allows a small quantity
of water to escape during the heating cycle. However, if it
discharges more than a bucket full of water in 24 hours,
there may be another problem.
•Continuous dribble
Try gently raising the easing lever on the relief valve for a
few seconds (refer to “Temperature Pressure Relief Valve”
on page 12). This may dislodge a small particle of foreign
matter and clear the fault. Release the lever gently.
•Steady flows for long period (often at night)
This may indicate the mains water pressure sometimes rises
above the designed pressure of the water heater. Ask your
installing plumber to fit a pressure limiting valve.
NEVER replace the relief valve with one of a higher pressure rating.
•Heavy flows of hot water until the water heater is cold - then stops until water reheats
The water heater must be switched off at the isolating switch or switchboard. Phone your nearest
Solahart Dealer to arrange for an inspection.
EXPANSION CONTROL VALVE RUNNING
If an expansion control valve is fitted in the cold water line to the water heater (refer to page 29)it may
discharge a small quantity of water instead of the temperature pressure relief valve on the water heater.
The benefit is that energy is conserved as the discharged water is cooler.
PRESSURE RELIEF VALVE DISCHARGING
A pressure relief valve is incorporated into the gas booster controls. This valve protects the gas
booster, 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 gas booster 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
gas booster. 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 19).
FAN CONTINUES TO RUN AFTER WATER HEATER OPERATION STOPS
It is the normal operation of the gas booster 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
16
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 gas booster.
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
With the installation of your new solar hot water system, maximum gas energy savings can be achieved
with careful planning of hot water usage. Should you at any time, feel your gas account is too high, we
suggest you check the following points:
•Is the relief valve running excessively? (Refer to “Temperature Pressure Relief Valve Running” on
page 15).
•Is one outlet (especially the shower) using more hot water
than you think? (Refer to “Gas Booster Operating Too
Frequently” on page 13).
•Is there a leaking hot water pipe, dripping hot water tap, etc?
Even a small leak will waste a surprising quantity of hot
water and energy. Replace faulty tap washers, and have
your plumber rectify any leaking pipe work.
•Is the gas booster operating too frequently? (Refer to “Gas
Booster Operating Too Frequently” on page 13).
•Consider recent changes to your hot water usage pattern
and check if there has been any increase in tariffs since
your previous account.
COLLECTOR GLASS
Warranty DOES NOT cover breakage of solar collector glass. Check your household insurance policy
covers collector glass breakage.
Warning: Collector glass must not be replaced whilst the solar collector is on the roof.
The collector glass is not offered as a replacement part and no attempt should be made to remove it.
Should the solar collector require replacement, contact your nearest Solahart Dealer.
IF YOU HAVE CHECKED ALL THE FOREGOING AND STILL BELIEVE YOU NEED ASSISTANCE,
CALL YOUR NEAREST SOLAHART DEALER.

17
INSTALLATION – SOLAR STORAGE TANK
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)
The system is suitable for installation with Solahart ‘J’ or ‘KF’ solar collectors.
The solar circuit must be installed with a continuous fall of a minimum 5° in the pipe work from the solar
collectors to the solar storage tank, the solar hot and solar cold pipes must be fully insulated with closed
cell polymer insulation (minimum thickness 13 mm) and the system charged with correctly mixed closed
circuit fluid to offer protection against freeze damage. The system has NO WARRANTY for freeze
damage if there is not a continuous fall in the solar hot and solar cold pipes or they are uninsulated or
the closed circuit fluid has been incorrectly mixed (refer to “Warranty Exclusions” on page 53).
SOLAR WATER HEATER STORAGE TANK LOCATION
The solar storage tank is suitable for outdoor installation only. The solar storage tank should be
installed close to the most frequently used outlet and 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.
Consideration must also be given to the position of the solar storage tank in relation to the solar
collectors. There are limitations on both the maximum length of the solar hot and solar cold pipes and
the maximum height between the solar storage tank and the solar collectors. Refer to “Solar Collector
Location” on page 26 and to “Pipe Lengths” on page 27.
Clearance must be allowed for servicing of the solar
storage tank and gas booster. The solar storage tank
must be accessible without the use of a ladder or
scaffold. Make sure the temperature pressure relief
valve lever is accessible and the front panel and front
covers can be removed for service.
You must be able to read the information on the rating
plate. If possible leave headroom of one water heater
length so the anode can be inspected or replaced.
Remember you may have to remove the entire solar
storage tank later for servicing.
The installation must comply with these installation
instructions and with the requirements of
AS/NZS 3500.4, AS 5601, AS/NZS 3000 and all local
codes and regulatory authority requirements. In New
Zealand, the installation must conform with 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.
It is recommended the solar storage tank be installed at ground or floor level and must stand vertically
upright.
Note: It is important for the solar storage tank to be orientated vertically upright in order for the falling
film of closed circuit fluid to operate efficiently.
A secondary flue is not required. The water heater must not be installed indoors or in a confined space.

INSTALLATION – SOLAR STORAGE TANK
18
The top of the solar storage tank must be a minimum of 500 mm below the bottom of the solar
collectors for the system to operate correctly.
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 gas booster and the
eaves.
•At least 300 mm between the gas booster and the edge of
any opening into the building, measured horizontally along
the wall.
•At least 300 mm between the gas booster 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 gas booster and any opening
into a building, in the direction of the flue discharge.
•At least 500 mm between the gas booster and a fence, wall or other obstruction, in the direction of
the flue discharge.
The water heater can be turned through 90°, either to the left or to the right, with the discharge from the
flue terminal discharging parallel to the wall. It is important the distance requirements from the
Australian Gas Installations Standard AS 5601 are observed.
FROST PROTECTION
The water heater has a frost protection system. The frost protection system will protect the water heater
from damage, by preventing ice forming in the waterways of the water heater, in the event of freezing
conditions occurring.
The solar collectors and solar cold and solar hot pipes only contain closed circuit fluid when the pump is
operating during periods of solar gain when heating is required. When the solar pump stops operating,
the closed circuit fluid drains back into the storage tank heat exchanger. The closed circuit fluid is an
anti-freeze agent which, when mixed to the correct specification, can withstand temperatures of -17°C
before it may freeze.
The frost protection system to the gas booster 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).

INSTALLATION – SOLAR STORAGE TANK
19
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 as shown in the installation diagram (refer to diagram on
page 29).
Model 270
Relief valve setting 1000 kPa
Expansion control valve setting * 850 kPa
Max. mains supply pressure
With expansion control valve 680 kPa
Without expansion control valve 800 kPa
Min. mains supply pressure 140 kPa
* Expansion control valve not supplied with the water heater.
TANK WATER SUPPLY
If the water heater is supplied with water from a tank supply, then a pressure pump system is
recommended to ensure a minimum water pressure of 140 kPa is achieved to allow the gas booster to
operate. Take care to avoid air locks.
Notes:
•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 52.

INSTALLATION – SOLAR STORAGE TANK
20
RAIN WATER TANK
If the solar collectors and solar pipe work are to be installed on a section of roof which is part of a rain
water runoff collection system, then it is recommended this section of roof and its gutter be isolated
from the rain water collection system. The gutter should be isolated to a width greater than the solar
collectors and pipe work and must have suitable drainage. The installer should ensure in the event of a
leak from the solar collectors or pipe work, a rainwater tank cannot be contaminated with closed circuit
fluid.
The section of roof and gutter should be isolated from the rainwater collection system before the
commissioning of the solar water heater, so that any leak or spillage during commissioning does not
make its way into the rainwater tank.
This section of roof and guttering can be isolated by either:
•blocking this section of gutter from the remaining gutter and fitting two separate down pipes, one to
take any run-off water from that section of roof away to waste and the other to the rainwater
collection side of the gutter to take the rain water run off to the rain water tank.
•blocking this section of gutter from the remaining gutter and fitting a tube or pipe of a material
compatible with the gutter material in this section of the gutter and penetrating the separation
pieces at either end to allow rainwater runoff to pass from one part of the rainwater collection
system to the other. It may be necessary to fit a down pipe to the section of blocked gutter to take
any run-off water from that section of roof away to drain.
•installing a false gutter inside of the existing gutter, with a down pipe penetrating the existing gutter
to take any run-off water from that section of roof away to waste. The false gutter should be no
deeper than half of the depth of the existing gutter, so as to enable rain water run off to flow under
the false gutter.
•installing a flashing from the underside of the roofing material, with a continuous fall, to over the
outside lip of the gutter. The flashing should extend wider than the collectors and pipe work and
turned up at the ends so if there is leakage of closed circuit fluid, it cannot enter the gutter.
If any of these solutions are not practical, then the installer should discuss alternative options to suit the
installation with the house holder.
Any alterations to the roof drainage system must comply with the relevant building regulations, codes
and standards.