gledhill Stainless Lite Direct 90-300 litres, Stainless Lite Solar Direct 180-300 litres Design, Installation & Servicing Instructions

Design, Installation

& Servicing Instructions

Models

Stainless Lite Direct 90-300 litres

Stainless Lite Indirect 90-300 litres

Stainless Lite Solar Direct 180-300 litres

Stainless Lite Solar Indirect 180-300 litres

An unvented hot water storage unit complying

with the requirements of Building Regulations

Approved Document G3 and manufactured in

accordance with BS EN 12897, the specifi cation

for the unvented water storage vessels.

Page 2

Section Page

DESIGN

Description 3
Technical Information 6
System Design 8

INSTALLATION

Installation 10
Commissioning 19

USER INSTRUCTIONS 20

SERVICING AND MAINTENANCE

Servicing and Maintenance 21
Fault Finding 22
Short Parts List 25

ADDENDIX

Addendix A 26
Addendix B 27

Service Record 28
Notes 29

Terms & Conditions 30

ISSUE 9: 05-09

These instructions should be read in conjunction with the installation/servicing
instructions issued by the manufacturer of the heat source being used.

Any installation must be in accordance with the relevant requirements of the Gas
Safety Regulations, Building Regulations, I.E.E. Wiring Regulations and the W ater F itting
Regulations (England and Wales) or Water Byelaws (Scotland). It should be read in
accordance with the relevant recommendations of the following:
BS 6798; BS 5549; BS 5546;
BS 5440:1; BS 5440:2; CP 331:3
BS 6700: BS 5258 and BS 7593: 1992

Stainless Lite is covered by Section G3 of the Building Regulations (England and
Wales) Technical Standard P3 (Scotland) and Building Regulation P5 (Northern Ireland.
Compliance can be achieved via a Competent Person Self Certifi cation Scheme or
notifi caton of installation to the Local Authority Building Control Department.

It must be installed by a competent person as defi ned by the relevant regulations.
Manufacturers notes must NOT be taken as over-riding statutory obligations.

This appliance is not intended for use by persons (including children) with reduced
physical, sensory or mental capabilities, or lack of experience and knowledge unless
they have been given supervision or instruction concerning use of the appliance by
a person responsible for their safety. Children should be supervised at all times to
ensure they do not play with the appliance.

This information is provided to assist generally in the selection of equipment.
Responsibility for selection and specifi cation of our equipment must however remain that

of our customer and any experts or consultants concerned with the installation(s).
PLEASE NOTE: THAT WE DO NOT THEREFORE ACCEPT ANY RESPONSIBILITY FOR

MATTERS OF DESIGN SELECTION OR SPECIFICATION, FOR THE EFFECTIVENESS
OF AN INSTALLATION OR SYSTEM CONTAINING ONE OF OUR PRODUCTS UNLESS
SPECIFICALLY REQUESTED TO DO SO IN WRITING.

All goods are sold subject to our Conditions of Sale which are set out at the rear of this
specifi cation. In the interest of continuously improving the Stainless Lite range , Gledhill
Building Products Limited reserve the right to modify the product without notice, and
in these circumstances this booklet, which is accurate at the time of printing, should
be disregarded. An updated set of Instructions will be produced and supplied with
new appliances and will be made available for other appliances on request.

A KIWA PRODUCT APPROVED TO C OMPL Y WITH ALL RELEV ANT PART S OF THE BUILDING
REGULATIONS AND WATER SUPPLY (WATER FITTINGS) REGULATIONS.

Stainless Lite IS PRODUCED UNDER AN ISO 9001:2008 QUALITY MANAGEMENT SYSTEM
APPROVED BY BSI.

As part of the industry wide “benchmark” initiative all Gledhill Stainless Lite appliances no w
include a Benchmark Installation, C ommissioning and Service Record Log Book. Please r ead
carefully and complete all sections relevant to the appliance installation. Carrying out the
work required and completing the Log Book will satisfy the requirements of the Building
Regulations for commissioning as set out in the Domestic Heating Compliance Guide. The
details of the Log Book will be required in the event of any warranty work being required .
There is also a section to be completed after each regular service visit. The completed

Log Book and these instructions should be left with the cylinder.

Page 3

DESCRIPTION

DESIGN

Maintenance

Modifications should not be made to this
product. Replacement parts, including
immersion heaters, should be purchased from
Gledhill Building Products Limited, or agents
approved by them. Unvent ed hot water storage
vessels need regular routine checks, and these
are detailed below. It is for this reason that this
manual must always be left with the Stainless
Lite.

It is essential that these checks be carried out
at the time of boiler maintenance by a qualifi ed
installer:

1. Manually open the relief valves in turn, and
check that water is discharged from the
valves and runs freely through the tundish
and out at the discharge point. Ensure that
the valves re-seat satisfactorily. (Note - the
water may be very hot).

2. It is important to check that the discharge
pipework is carrying the water away
adequately. Check for blockages etc. if it is
not.

3. Turn the mains water off and remove and
clean the strainer element in the Pressure
Reducing Valve.

4. Check the charge pr essure in the expansion
vessel and repressurise if required

5. Re-fi ll the system and ensure that all relief
valves have re-seated.

6. The Benchmark log book supplied should
be updated at each service.

7. Check the water pressure downstream of
the combination valve is 2.25 bar in static
condition.

8. Check and if necessar y, descale the heat
exchanger in hard water areas ie. above
200ppm (mg/l).

Note:

The cylinder is factory fi tted with a temperature
& pressure relief valve that must not be used for
any other purpose or removed.

The cylinder is factory fi tted with immersion
heaters with thermal cut outs. Immersions
without thermal cut outs must not be fi tted.

Manufacturer: Gledhill Building Products Ltd

Maximum inlet pressure to
Pressure Reducing Valve 12 bar
Operating pressure (PRV setting) 2.2 bar
Expansion Relief Valve setting 4.5 bar
Maximum primary working pressure 3.5 bar
Opening pressure of T & P Relief Valve 6 bar
Opening temperature of T & P Relief Valve 95°C
Energy cut-out thermostat setting 80°C
Immersion heater: Rating: 3kW, 240V AC

All cylinders are manufactured in accordance with the requirements of BS EN 12897
The tundish must be positioned so that it is visible to the occupant and is away from
electrical devices.

Components supplied with Stainless Lite:

• Cold water inlet combination valve

• Expansion relief/PRV combination valve

• Temperature and pressure relief valve

• Control thermostat

• Energy cut-out thermostat

• Energy cut-out motorised valve (indirects only)

• Tundish

• 3Kw Immersion heater

• Expansion vessel/mounting bracket/fl exible hose

• Technical/user product literature
(Note: Two immersion heaters are supplied with the direct Stainless Lite)

In any situation where the volume of heated pipew ork (eg. secondary circulation
pipes or manifold pipework for multiple units) exceeds 10 litres, then an
additional expansion vessel must be fi tted to accommodate the extra expansion
volume.

Handling Before Installation

Stainless Lite must be handled with care and stored the correct way up in a dry place.
Any manual handling/lifting operations will need to comply with the requirements of
the Manual Handling Operations Regulations issued by the H.S.E. The appliance can
be moved using a sack truck on the rear face although care should be taken and the
route should be even. In apartment buildings containing a number of storeys we would
recommend that the appliances are moved vertically in a mechanical lift. If it is proposed
to use a crane, expert advice should be obtained regarding the need for slings , lifting
beams etc.

A specifi c manual handling assessment is shown in Appendix B at the rear of this
manual.

Page 4

DESIGN

DESCRIPTION

Stainless Lite is a range of unvented hot water
storage cylinders, manufactured in the latest
high quality duplex stainless steel. They are
designed to provide mains pressure hot water
and are supplied as a package which complies
with Section G3 of the Building Regulations.
The appliance is extremely well insulated using
high density HCFC free foam insulation with an
ozone depleting potential (ODP) of zero and a
global warming potential (GWP) of 1. It is fi tted
with all necessary safety devices and supplied
with all the necessary control devices to make
installation on site as easy as possible.

Stainless Lite is available in four basic
variants:

1. Stainless Lite Direct - For providing hot
water heated by electricity (Figure 1).

2. Stainless Lite Indirect - For use with gas
or oil boilers (Figure 2). Unvented cylinders
must not be used with solid fuel boilers or
steam as the energy source.

3. Stainless Lite Direct Solar - For providing
hot water by solar gains and electricity.
(Figure 3).

4. Stainless Lite Indirect Solar - For providing
hot water by solar gains and gas or oil boilers
(Figure 4). Unvented cylinders must not be
used with solid fuel boilers or steam as the
energy source.

Stainless Lite Direct

Stainless Lite direct is an electrically heated,
unvented hot water storage cylinder designed
primarily for use with off peak electrical
supplies.

It is supplied fi tted with two 3kW immersion
heaters which are BEAB approved for safety as
recommended by the Electricity Council.

Stainless Lite direct models are listed in
Table 1 on Page 6 & 7.

Stainless Lite Indirect

Stainless Lite indirect is an unvented hot
water storage cylinder and is provided with a
high effi ciency internal primary coil which is
designed for use with a gas or oil boiler and
is suitable for both open vented and sealed
pumped primary systems.

When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.

Stainless Lite indirect models are listed in

Table 1 on Page 6 & 7.

Stainless Lite

DIRECT

Stainless Lite

INDIRECT

Figure 1 Figure 2

Pipework is not supplied by manufacturer,

but to be supplied and fi tted by installer.

Page 5

DESCRIPTION

DESIGN

Stainless Lite

DIRECT SOLAR

Stainless Lite

INDIRECT SOLAR

Figure 3 Figure 4

Pipework is not supplied by manufacturer,

but to be supplied and fi tted by installer.

Stainless Lite Direct Solar

Stainless Lite direct is an electrically heated,
unvented hot water storage cylinder designed
primarily for use with off peak electrical
supplies.

It is supplied fi tted with two 3kW immersion
heaters which are BEAB approved for safety as
recommended by the Electricity Council.

A high effi ciency coil is positioned in the lower
part of the Stainless Lite vessel to ensure
maximum benefi t of solar gain energy.

Stainless Lite direct models are listed in
Table 1 on Page 6 & 7.

Stainless Lite Indirect Solar

Stainless Lite indirect is an unvented hot
water storage cylinder and is provided with a
high effi ciency internal primary coil which is
designed for use with a gas or oil boiler and
is suitable for both open vented and sealed
pumped primary systems.

When used with a sealed heating system the
boiler must incorporate its own energy cut-out
overheat thermostat.

A high effi ciency second solar coil is positioned
below the primary coil to ensure maximum
benefi t of solar gain energy.

Stainless Lite indirect models are listed in

Table 1 on Page 6 & 7.

Note:
The cold supply elbow c/w drain tapping
must be fi tted as shown in fi gs 1, 2, 3 and 4.
A fl exible hose can then be connected to the
drain tapping and, providing the hose runs
below the lowest level of the cylinder, then
all the water contents can be drained out by
syphonic action.

Page 6

DESIGN

TECHNICAL INFORMATION

Table 1

Model

Weight - Empty

Weight - Full

Capacity (Total Volume)

Pressure Regulator 2.25bar inlet

group c/w balance cold supply,

expansion vessel connection and

expansion valve set at 4.5 bar

Exp

ansion Vessel size.

Pre-charged to 2.25bar

Overall Height

Overall Diameter

Pressure & Temperature

Relief Valve 6bar 90°C

22mm Secondary

Return Tapping

On Peak 1¾” Incalloy

Immersion 3kW

Cold Feed 22mm

Compression Connection

Lower 1¾” Incalloy

Immersion 3kW

Volume of On Peak Water

Heated

Dual Control & Overheat Stat

kg kg Litres bar Litres A=mm mm B=mm C=mm D=mm E=mm F=mm Litres G=mm

Direct

D90 13 103 90 2.25 12 732 550 490 n/a n/a 367 223 n/a n/a
D120 18 138 120 2.25 12 920 550 678 n/a 487 367 223 55 n/a
D150 22 172 150 2.25 18 1107 550 865 n/a 587 442 223 70 n/a
D180 24 204 180 2.25 18 1295 550 1053 n/a 686 442 223 85 n/a
D210 28 238 210 2.25 24 1483 550 1241 1127 786 442 223 90 n/a
D250 32 282 250 2.25 24 1733 550 1491 1377 927 522 223 125 n/a
D300 37 337 300 2.25 35 2020 550 1777 1577 1077 522 223 155 n/a

Indirect

IND90 19 109 90 2.25 12 732 550 490 n/a n/a 367 352 n/a 367
IND120 22 142 120 2.25 12 920 550 678 n/a n/a 367 352 n/a 367
IND150 26 176 150 2.25 18 1107 550 865 n/a n/a 442 392 n/a 407
IND180 28 208 180 2.25 18 1295 550 1053 n/a n/a 442 432 n/a 447
IND210 33 243 210 2.25 24 1483 550 1241 1127 n/a 442 432 n/a 482
IND250 38 278 250 2.25 24 1733 550 1491 1377 927 522 512 125 577
IND300 44 344 300 2.25 35 2020 550 1777 1577 1077 522 512 155 677

Solar Direct

SOL180d 26 206 180 2.25 18 1295 550 1053 n/a 746 437 482 75 n/a
SOL210d 30 240 210 2.25 24 1483 550 1241 1127 908 437 544 80 n/a
SOL250d 34 284 250 2.25 24 1733 550 1491 1377 1092 522 629 100 n/a
SOL300d 39 339 300 2.25 35 2020 550 1777 1577 1287 522 724 115 n/a

Solar Indirect

SOL180i 30 210 180 2.25 18 1295 550 1053 n/a n/a 437 717 80 732
SOL210i 35 245 210 2.25 24 1483 550 1241 1127 n/a 437 822 95 837
SOL250i 40 290 250 2.25 24 1733 550 1491 1377 n/a 522 947 115 962
SOL300i 46 346 300 2.25 35 2020 550 1777 1577 n/a 522 1042 140 1092

A

C

Direct

D

F

E

B

A

Solar Direct

C

N

M

L

P

E

K

B

D

F

A

C

Indirect

D

H

F

E

I

J

B

G

Page 7

TECHNICAL INFORMATION

DESIGN

Extra Stat Pocket

For Boiler Use If Required

22mm Primary Return

Compression Connection

22mm Primary Flow

Compression Connection

22mm Solar Return

Compression Connection

22mm Solar Flow

Compression Connection

Dual Control/Overheat Stat

& Solar Control

Thermostat Pocket

Solar Pocket

Solar Pocket

kW Rating of Primary Coil

Surface Area of

Primary Heater Coil

Pressure Loss Across

Primary Heater Coil

Surface Area of

Solar Heater Coil

Pressure Loss Across Solar

Heater Coil

Heat Up Time from 15°C to 60°C

(applies to Primary Heat Source only)

Recovery Time after 70% Draw Off

(applies to Primary Heat Source only)

Standing Losses kWhr/24hr

Dedicated Solar Volume

H=mm I=mm J=mm K=mm L=mm M=mm N=mm P=mm kW m

2

bar m

2

bar min min kWh Litres

n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 90 58 0.80 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 119 90 1.00 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 150 121 1.20 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 179 157 1.40 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 209 192 1.60 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 249 224 1.75 n/a
n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a n/a 299 263 1.93 n/a

367 223 312 n/a n/a n/a n/a n/a 16.5 0.59 0.165 n/a n/a 21 16 0.80 n/a
367 223 312 n/a n/a n/a n/a n/a 18 0.59 0.165 n/a n/a 27 19 1.00 n/a
407 223 352 n/a n/a n/a n/a n/a 18.5 0.68 0.191 n/a n/a 28 19 1.20 n/a
447 223 392 n/a n/a n/a n/a n/a 19 0.78 0.216 n/a n/a 33 21 1.40 n/a
482 223 392 n/a n/a n/a n/a n/a 20.5 0.78 0.216 n/a n/a 41 26 1.60 n/a
577 223 472 n/a n/a n/a n/a n/a 21.5 0.97 0.241 n/a n/a 44 30 1.75 n/a
677 223 472 n/a n/a n/a n/a n/a 25 0.97 0.241 n/a n/a 48 32 1.93 n/a

n/a n/a n/a 223 352 419 882 203 n/a n/a n/a 0.680 0.191 n/a 90 1.40 60
n/a n/a n/a 223 352 419 1000 203 n/a n/a n/a 0.680 0.191 n/a 115 1.60 70
n/a n/a n/a 223 472 539 1180 262 n/a n/a n/a 0.968 0.241 n/a 139 1.75 84
n/a n/a n/a 223 472 539 1367 262 n/a n/a n/a 0.968 0.241 n/a 187 1.93 100

n/a 457 677 223 352 419 882 203 18 0.59 0.165 0.680 0.191 28 16 1.40 60
n/a 522 782 223 352 419 1000 203 18.5 0.68 0.191 0.680 0.191 35 16 1.60 70
n/a 607 907 223 472 539 1180 262 19 0.78 0.216 0.968 0.241 38 19 1.75 84
n/a 702 1002 223 472 539 1367 262 20.5 0.78 0.216 0.968 0.241 41 20 1.93 100

F

Solar Indirect

N

G

P

I

E

K

J

A

B

M

L

C

4

0

,0

0

º

4

5

,

00º

3

5

,

0

0º

2

5,

0

0

º

1

5

,

0

0

º

NOTES

1. Not all models - see table 1.

2. Recovery times based on Primary
Coil/I.H. duty (ie. assumes the boiler
output is adequate).

3. All connections are supplied with
compression fittings for direct
connection to copper pipework.

Page 8

INSTALLATION

INSTALLATION

Stainless Lite Direct

Basic Appliance

1. Hot water draw off (22mm) compression

2. Temperature & pressure relief v alve 90°/6 bar

3. Hot water secondary return 22mm capped
(not fi tted to smaller sizes, see table 1)

4. Immersion heater 1¾” BSP 3kW

(normally on-peak)

5. 22mm cold supply compression

6. Immersion heater 1¾” BSP 3kW

(normally off-peak)

Component kit supplied separately

A. Combination inlet group incorporating

pressure reducing valve, strainer, check
valve, balance cold take off point, expansion
relief valve and expansion vessel connection
points.

B. Portable expansion vessels c/w fl exible hose

and wall bracket

C. Tundish

Stainless Lite Indirect

Basic Appliance

1. Hot water draw off (22mm) compression

2. Temperature & pressure relief v alve 90°/6 bar

3. Hot water secondary return 22mm capped
(not fi tted to smaller sizes, see table 1)

4. Immersion heater 1¾” BSP 3kW

5. 22mm cold supply compression

6. Immersion heater 1¾” BSP 3kW

7. Dual control/overheat stat pocket (22mm)

8. Boiler control sensor pocket (spare)

9. Primary return (22mm)

10. Primary fl ow (22mm))

Component kit supplied separately

A. Combination inlet group incorporating

pressure reducing valve, strainer, check
valve, balance cold take off point, expansion
relief valve and expansion vessel connection
points.

B. Potable expansion vessels c/w fl exible hose

and wall bracket

C. Tundish
D. Dual control thermostat and combined

overheat thermostat

E. Two port (22mm) zone valve for
primary circuit
F. Wiring junction box for primary system

1

2

5

3

4

6

1

2

3

4

7

5

6

9

8

10

Typical arrangement of component kit shown fi tted to the appliance for clarity

Pipework to be supplied and fi tted by installer.

Page 9

INSTALLATION

INSTALLATION

7

9

3

11

6

12

12

1

2

8

4

5

10

Stainless Lite Direct Solar

Basic Appliance

1. Hot water draw off (22mm) compression

2. Temperature & pressure relief v alve 90°/6 bar

3. Hot water secondary return 22mm capped

(not fi tted to smaller sizes, see table 1)

4. Immersion heater 1¾” BSP 3kW
(normally on-peak)

5. 22mm cold supply

6. Immersion heater 1¾” BSP 3kW
(normally off-peak)

7. Dual control/Overheat stat & solar

thermostat pocket

8. Solar coil return to panel collector (22mm)

compression

9.

Solar coil fl ow from panel (22mm) compression

10. Solar thermostat pocket

Component kit supplied separately

A.

Combination inlet group incorporating pressure
reducing valve, strainer, check valve, balance
cold take off point, expansion relief valve and
expansion vessel connection points.

B. Portable expansion vessels c/w fl exible hose

and wall bracket
C. Tundish
D. Dual control thermostat and combined

overheat thermostat

Stainless Lite Indirect Solar

Basic Appliance

1. Hot water draw off (22mm) compression

2. Temperature & pressure relief v alve 90°/6 bar

3. Hot water secondary return 22mm capped

(not fi tted to smaller sizes, see table 1)

4. Immersion heater 1¾” BSP 3kW

5. 22mm cold supply

6. Thermostat pocket (22mm)

7. Primary return (22mm)

8. Primary fl ow (22mm)

9. Dual control/Overheat stat & solar

thermostat pocket

10. Solar coil return to panel collector (22mm)

compression

11.

Solar coil fl ow from panel (22mm) compression

12. Solar thermostat pocket

Component kit supplied separately

A.

Combination inlet group incorporating pressure

reducing valve, strainer, check valve, balance

cold take off point, expansion relief valve and

expansion vessel connection points.
B. Potable expansion vessels c/w fl exible hose

and wall bracket
C. Tundish
D. Dual control thermostat and combined

overheat thermostat (x2)
E. Two port (22mm) zone valve for
primary circuit
F. Wiring junction box for primary system

1

2

5

8

7

6

4

3

9

10

10

Typical arrangement of component kit shown fi tted to the appliance for clarity

Pipework to be supplied and fi tted by installer.

Page 10

INSTALLATION

INSTALLATION

General Design Considerations

The cupboard footprint needs to be at least
650mm square.

The base chosen for the cylinder should be level
and capable of supporting the weight of the unit
when full of water as shown in General Data. The
discharge pipework for the safety valves must hav e
a minimum fall of 1 : 200 from the unit to a safe
discharge point. All exposed pipework should be
insulated and the unit should NOT be fi xed in a
location where the contents could freeze.

The pipe connecting the boiler fl ow to the
appliance must not be less than 22mm copper
or equivalent.

Mains Water Supply

Existing properties with a 15mm supply will be
satisfactory provided the local mains pressure
is good, but should be confined to single
bathroom properties. F or new properties where
simultaneous demand is required to more than
one bathroom or a bathroom and one or more
en-suites, the communication and service pipe
into the dwelling should be a minimum of 22mm
(usually in the form of a 25mm MDPE supply).
The minimum recommended static pressure
to operate a Stainless Lite domestic system is 3
bar. There should be a fl ow of at least 30 litres
per minute or above available into the property .
Normally Stainless Lite provides well in excess
of 40 litres/min in most conditions. Flow rates
for ALL mains pressure systems are subject
to district pressures and system dynamic loss.
Particularly on larger properties with more
than one bathroom, the pipe sizes should be
calculated in accordance with BS6700.

Model Selection

The suggested Direct model sizes, shown
opposite, are based on a typical days hot water
use assuming an Economy 7 tariff is provided.
A reduction of one model size can normally be
made with an Economy 10 tariff.

When using the Direct models for high
specifi cation developments an increase of one
model size should be considered.

Where selecting a solar model, it is important to
check the dedicated solar volume (shown in table
1 on page 7) is suitable for the total fl oor area of
the dwelling to ensure compliance with Building
Regulations. The maximum fl oor area of the dwelling
permitted for the models is shown opposite.

The suggested model sizes are based on
typical hot water usage. For high specifi cation
dwellings an increase of one model size should
be considered.

I.V.

Combination Valve

I.V.

Model Selection Guide

Max hot water demand

Max number

of bed spaces

(Bedrooms)

Indirect

litres

Direct

litres

1 shower room Bedsit (0) 90 120

1 bathroom 2 (2) 120 150
1 bathroom 4 (3) 120 180

1 bathroom + separate shower room 6 (4) 150 210

1 bathroom + 2 separate shower rooms

or 2 bathrooms

7 (5) 180 210

2 bathrooms + separate shower room 7 (5) 210 250

2 bathrooms + 2 separate shower rooms 7 (5) 250 300

3 bathrooms + 2 separate showers rooms 9 (6) 300 -

If two Stainless Lites are coupled together the secondary inlet and outlet pipes must
be balanced. The units must be fi tted on the same level.

Note: No valves must be fi tted between the expansion vessel and the storage cylinder(s).

Solar Model Selection Guide

Max hot water demand

Max fl oor

area (m

2

)

Bedrooms

Indirect

litres

Direct

litres

1 shower room 44 Bedsit - 180

1 bathroom 44 1-3 180 -

1 bathroom 66 1-3 210
1 bathroom + 1 shower room 66 1-3 210 ­1 bathroom + 1 shower room 84 1-3 - 250

1 bathroom + 2 shower rooms 84 2-4 250 ­1 bathroom + 2 shower rooms 113 2-4 - 300
2 bathrooms + 1 shower room 113 3-4 300 -