OSO HOTWATER Super SC 120 User manual

OSO HOTWATER (UK) LIMITED
Endeavor House, Seventh Avenue,
Team Valley Trading Estate,
Gateshead,
Tyne & Wear,
NE11 0RU
Phone: [phone] Fax: [phone]
E-mail [email protected]
E-mail [email protected]
E-mail [email protected]
www.osohotwater.co.uk
Super S - SCI
120 - 300 litre
EN
INSTALLATION INSTRUCTIONS
TDS - TECHNICAL DATA SHEET

2
INNHOLDSFORTEGNELSE
1. Sikkerhetsinstruks................................................. 3
1.1 Generell informasjon ................................... 3
1.2 Sikkerhetsinstruks for brukeren............. 4
1.3 Sikkerhetsinstruks for installatøren...... 4
2. Produktbeskrivelse............................................... 5
2.1. Produktidentifikasjon................................... 5
2.2. Bruksområde................................................... 5
2.3 CE merking....................................................... 5
2.4 Tekniske data................................................... 5
2.5. ErP data (TDS).................................................. 5
3. Installasjonsinstruks............................................. 6
3.1. Produkter omfattet av instruksen......... 6
3.2. Medfølgende i leveransen........................ 6
3.3. Produktdimensjoner.................................. .. 6
3.4. Krav til installasjonssted ............................ 7
3.5. Rør-installasjon og ekspansjonskar..... 8
3.6. El-installasjon ................................................. 10
4. Igangsettelse første gang................................ 12
4.1. Fylling av vann............................................... 12
4.2. Påsettelse av strøm..................................... 12
4.3. Innstilling av blandeventil........................ 12
4.4 Kontrollpunkter............................................. 12
4.5 Oppstart av ekspansjonsløsning............12
4.6. Tømming av vann........................................ 13
4.7. Overlevering til sluttbruker..................... 13
5. Brukerveiledning ................................................. 14
5.1. Innstillinger...................................................... 14
5.2. Vedlikehold..................................................... 15
6. Feilsøking.................................................................. 16
6.1. Feil og løsninger........................................... 16
7. Garantibetingelser.............................................. 17
7.1. Garanti og garantiregistrering.............. 17
7.2. Kundeservice.................................................. 17
8. Demontering av produktet .......................... 17
8.1. Demontering.................................................. 17
8.2. Returordning.................................................. 17
9. Notater........................................................................ 18

3
1. GENERAL INFORMATION
1.1 General Information
Thank-you for purchasing the OSO Super S
unvented hot water cylinder. Designed to be
simple and neat to install, the Super S differs from
other unvented cylinders in that all of the principle
connections, including hot and cold water pipes
and expansion vessel are connected to the top of
the cylinder. Full size template is provided to
facilitate pipe positioning.
OSO advise that the connecting pipes and
electrical cables are fixed in place prior to the
positioning of the cylinder. Moving the cylinder
into position should be the last thing done before
connection of pipes and commissioning of the
cylinder.
This manual gives detailed advice for installation
and should be read carefully prior to fitting any
unvented unit. OSO Super S cylinders are not
suitable for gravity fed primary systems. In known
hard water regions, precautions should be taken
to prevent limescale formation in hot water
cylinders, in accordance with Building Regulation
Part L, Domestic Heating Compliance Guide.
This OSO cylinder must be installed by a
competent person and be installed in compliance
with the OSO Installation and Maintenance
Instructions, all current legislation, codes of
practice and regulations governing the installation
of unvented hot water cylinders in force at the
date of installation.
Symbols used in this manual:
!WARNING Possibility of serious injury or death
!Caution Possibility of minor or moderate injury to person or property
PROHIBITED to perform
!
Must be done
!
This document must be stored in a suitable location, available for future reference
!

4
2.5 ErP data - Technical Data Sheet
2. PRODUCT DESCRIPTION
2.1 Product Identification
Identification of your product can be found on the
label attached to the product. The label contains
information about the product according to EN
12897: 2016 and EN 60335-2-21, in addition to
other useful data. See Declaration of Conformity
at www.osohotwater.com for more information
OSO products are designed and manufactured
according to:
• Tank standard EN 12897:
2016
• Safety Standard EN 60335-2-21
• Welding standard ISO 3834-2
OSO Hotwater AS is certified according to
• Quality ISO 9001
• Environment ISO 14001
• Working Environment OHSAS 18001
2.3 CE marking
The CE mark indicates that the product complies
with the current directives. See Declaration of
Conformity at www.osohotwater.com for more
information.
The product complies with the directives for
• Low Voltage LVD 2014/35/EU
•Electromagnetic compatibility EMC2014/30EU
•Press Equipment PED 2014/68/EU
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AS
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AS
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AS
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AS
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This indirect hot water storage tank is intended to be connected to a high efficiency external energy
source. The immersion heaters are intended for backup and supplementary use only. Immersion heaters
as sole heat source should be avoided and would lead to higher energy consumption and higher
operating cost.

5
1.2 Handling
The product should be transported carefully
with packaging as illustrated. Use the handle
cut outs in the box
!Caution
Tappings, valves etc. should not be used to lift
the product as this may cause malfunction.
Min.
400 mm
1.3 Clearances
Min.
150mm

• Documentation supplied
• Installation manual & Service logbook
• Template for connecting pipeworkk
•Immersion heater(s) - (3kW).
•Thermostats / thermal cut-out.
•Drain Cock.
•Lid for cylinder.
1.2Health and safety regulations
Handling Operations Regulations 1992 defines
manual handling as: “any transporting or
supporting of a load (including the lifting,
putting down, pushing, pulling, carrying or
moving thereof by hand or bodily force” The
Regulations set no specific requirements such as
weight limits. However common sense still has
to be used based on an ergonomic approach for
each individual. The Super S should be
transported and stored in a vertical position.
1.3Siting the Super S
The cylinder should not be positioned until the
connecting pipework and cables are
fitted. There are few restrictions on the siting of
the OSO Super S, however it should not be sited
anywhere open to frost attack. The unit should
be placed on a stable flat surface capable of
withstanding the weight of the cylinder when
full (see table on page 16) and access must be
allowed for maintenance purposes. Prior to
positioning the cylinder, wind out the feet in the
base to protrude by 10mm(35mm if using
optional wall bracket). If wall mounted with an
OSO wall bracket, the wall should be capable of
withstanding the forces generated by the weight
of the full cylinder. Provision should also be
allowed for the routing of the discharge pipe
away from the cylinder to an outside point
according to building regulation G3.
1.4Component check list
Components supplied with the unit in a
separate accessory kit for site fitting
• Expansion vessel with wall bracket
(Super S 300 only).
• Tundish (including screws).
• Plastic cable clamp.
Components factory fitted
• Expansion vessels with T piece
connector.
• Flexible hose for expansion vessel.
• Combination valve, includes line
strainer, pressure reducing valve, balanced cold
water connection, (for shower or bidet only),
blanking cap for balanced cold water
connection, temperature & pressure relief valve
and hot water blending valve.
1.5 Supply requirements
An uninterrupted 22mm cold water mains
supply is recommended, however if only a
15mm supply is available, this may be used
provided there is sufficient flow rate
available A minimum standing pressure of
2.5 bar and a flow rate of 20 litres per
minute with a 1 bar dynamic pressure is
recommended. The cylinder will operate at
lower pressures and flow rates however the
performance will be compromised. The OSO
unvented unit is designed for use with
supply pressure up to 8 bar. For pressures
over 8 bar an additional pressure reducing
valve must be fitted in the supply pipe to the
unit.
1.6 Expansion vessels
Super S 120-250: Twin expansion vessels
(single on 120) are factory fitted to the
multifunction valve Part K (see fig 1, page 3)
using the supplied flexible hose.
Super S 300: An external expansion vessel is
provided to be connected to the multifunction
valve Part K (see fig. 1, page 3)
The vessel(s) accommodate expanded water
when the cylinder is heated and prevents the
cylinder reaching itsmaximum working
pressure.
1.7 Non-compatible products.
Solid fuel boilers, wood burning stoves and
other non-thermostatically controlled heat
sources must not be used with unvented
cylinders.
1.8 Wall mounting
Wall mounting brackets are available for
OSO unvented units Super S 120-180.

A Pressure reducing valve 3 bar
B Expansion relief valve 8 bar - 1/2”
C Temp.&pressure relief valve 90°C /10 bar - 1/2”
D Hot water blending valve
E Expansion vessels (120-250 only)
FFlexible hose and T-piece (120-250 only)
G Tundish
H Flexible Y- hose
J Primary flow - ø22 m
K Expansion vessel connection point - 1/2” BSPM
L Line Strainer
M Cold water main supply inlet (CW in) - ø22 mm
N Balanced cold water connection (Bal. CW) - ø22
P Domestic hot water outlet (DHW out) - ø22 mm
R Primary return - ø22 mm
J
P
N
M
R
Fig
. 1
Front
E
Fig. 2
Rear
2. Installation
2.1 Pipework
The OSO Super S has all pipework
connections at the top of the cylinder with
these pipes secured to the rear wall. A
template is provided to assist in the
placement of these pipes. Decide where the
cylinder is to be positioned and secure the
wall template
(using supplied adhesive) with the cross on
the back wall at least 326mm from the left
wall. Ensure the cylinder feet are wound out
to protrude by 10mm. Refer to table C to
position the cross at the correct height above
the base for the appropriate capacity of the
cylinder. Please note that if the cylinder is
raised on its feet or on a plinth higher than
floor level, the height of the template above
the floor will need to be raised accordingly.
The connecting pipe tails should be fitted so
they reach out away from the back wall
horizontally, perpendicular to the wall and
parallel with each other. Table B shows the
exact lengths these tails should be cut from
wall to reach the cylinder connections. If pipes
are clipped up the back wall behind the
cylinder position, the tails should be longer.
Use the lengths marked “below”.
If the pipes approach the template points
from above/side, use the lengths marked
“above”. OSO recommend that the
discharge pipe should be located at the
left side of the cylinder
Tail lengths
from wall/
mm
Above Belo
w
Cold feed in 202 242
Hot water out 274 314
Balanced cold out 188 228
Primary ow & return 238 278
3.2 Electrical connections.
The OSO Super S is provided with two
channels in the base to lay electrical
cables to the cylinder. The channels run
diagonally from the front centre to the
rear left and right and allow the
installation to be neat with minimum
visible cabling. 1.5mm² 3 core heat
resistant flex is required for immersion .
Cables should be sufficient length to
reach from the junction box,through the
base channels and leave the amount of
tail from the front of the cylinder to be

3.2 Electrical connections (Cont)
able to reach the electrical connections.
When the cylinder is moved into position the
cables should be fed up another channel
behind the casing at the front of the cylinder
into the electrical box. When cables are in
place they can be secured using the cable
clamp supplied in the fittings bag
4. Pipe Connections
Before connecting the cold supply, flush the
cold supply pipework of all flux and debri. Lift
off the cylinder lid allowing access to the
combination valve and other connections.
4.1 Super S 150-250
Check the expansion vessels and hose
connections are tight. S 300: Fit the
expansion vessel and bracket on a suitable
wall close to the cylinder. Connect the
flexible hose to the expansion vessel
4.2 Remove the template
Position the cylinder to meet the heating and
domestic water pipes.
4.3 Combination valve.
The Combination valve at the top of the
cylinder is factory fitted and is water-tight. If
necessary it can be rotated in either direction
to suit the connecting pipework, up to half a
turn without losing its seal.
4.4 Cold mains supply.
Connect the cold mains supply to the
combination valve cold feed (Fig. 3). The
OSO unvented unit is designed for use with
supply pressure up to 8 bar. For water
pressures above 8 bar an additional
pressure reducing valve must be fitted to the
cold water supply pipe
4.5 Hot water outlet.
Connect the hot water distribution pipe to the
combination valve hot water outlet (Fig. 3).
Fig. 3
Cold mains
supply
Balanced
cold water
Hot water
outlet
4.6 Balanced cold water supply (optional).
If no balanced cold supply is required,
tighten the supplied blanking cap. If a
balanced mains pressure cold water supply
is required to a shower or bidet (over rim
type only, ascending spray type requires
type AA,AB or AD air gap, remove blanking
cap and connect to the shower or bidet cold
supply on the combination valve (Major
shower manufacturers advise fitting a mini
expansion vessel in the balanced cold supply
pipework to accomodate thermal expansion
and prevent tightening of shower controls
Using the balanced cold connection to feed
bath taps can reduce the flow available to the
unvented cylinder.
4.7 Expansion vessel (300 litre only)
Site the expansion vessel on the wall using
the supplied bracket and connect to the point
K on the multifunction valve with copper
pipe.
4.8 Flexible Y-hose
The flexible Y-hose is preformed to the
correct shape. Connect the inlet ends to the
expansion relief valve and the temperature
and pressure relief valve.
4.9 Tundish
Recommended position of the tundish is to
the left of the cylinder as seen from the front.
Connect the tundish inlet to the outlet end of
the flexible Y-hose. Tundish should be
visible and positioned away from electrical
devices. Tundish can be secured with
supplied screws.

4.11 Primary flow & return
Fit the elbows supplied to the primary flow
& return connections. Make the boiler
primary flow and return pipes to the unit.
The motorised valve can be connected to
either the primary flow or return pipe.
Ensure that the direction of flow is correct.
It is possible to fit the motorised valve on
the flow pipe on its side to fit under the
cylinder lid. For electrical connection of
the motorised valve and immersion
heater, please read Electrical Installation
Instructions. (Pages 5)
4.12 Secondary return (optional)
If a secondary return is connected, the
cylinder thermostats should be set to a
maximum of 60°C. Reduce thermostat
settings to "smart -" on direct units.
A secondary return can be connected via
the expansion vessel connection to the
combination valve. Remove the hose,
connect a short length of 15 mm copper
tube, fit a T piece, connect in the
secondary return and reconnect the exp.
vessel hose to the remaining T piece
outlet. An additional expansion vessel will
be required if the secondary return “loop”
exceeds 10% of the cylinder capacity.
1 metre of 22 mm pipe holds
approximately 1/3 litre of water. 15 mm
pipes carry approximately half that
volume. Secondary return must be
pumped by a bronze pump and fitted with
non return valves to ensure correct
direction of flow.
T-piece conn.
(120-250 only)
Flexible hose
Fit secondary
return here
according to
section 4.12
Fig.
4
4.10 Discharge pipe
Connect the tundish outlet to the
discharge pipe. Install the tundish in a
vertical position within a maximum of
500 mm from the Temperature and
Pressure Relief Valve drain
connection. Ensure the expansion
relief pipework discharges through the
tundish. Tundish pipework must be 22
mm with a minimum vertical length of
300 mm below tundish. Maximum
permitted length of 22 mm pipework is
9 m. Each bend or elbow is equivalent
to 0.8 m of pipework. All pipework
must have continous fall and
discharge in a safe, visible position. If
any doubt, refer to Building Regulation
G3. Discharge pipe must be dedicated
to the cylinder and must not be used
for any other purpose.
5. Commissioning
5.1 Commissioning and filling
1. Check all connections for tightness.
Open hot water tap furthest away from
the OSO water heater.
2. Open the mains stop cock to fill the
water heater . When water flows
evenly from tap, allow to run for a few
minutes to flush through any dirt, swarf
or residue, then close the tap Open
successive hot taps to purge any
remaining air.
3. Check all water connections for
leaks and rectify if necessary.
4. Manually operate Expansion relief
valve B (see fig. 1 on page 3) to
ensure free water flow through
discharge pip by turning knob counter-
clockwise. To close continue to turn
counter-clockwise until the valve shuts.

5.1 Commissioning and filling (Cont)
5. Manually operate Temperature and
Pressure Relief Valve C (see fig. 1 on
page 3) to ensure free water flows
through discharge pipe (Turn knob
counter-clockwise).
6. Switch electrical power on.
7. Replace the cylinder lid – this is
important as the lid prevents heat loss
from the cylinder and combination valve,
conserving valuable energy. Do not place
heavy objects on the lid.
5.2 Draining
Switch off the electrical power (Important
to avoid damage to element. Isolate boiler
from OSO unit. Turn off the cold water
supply valve. Open hot water tap. Open
drain at base of cylinder using a 6 mm
hex key. The unit will drain. Draining
process may be speeded up by opening
the temperature and pressure relief valve.
An internal ø18 mm hose can be applied
to lead the water to a gully, sink or similar
(see fig. 5)
5.3 System flushing
System flushing will not be necessary
under normal circumstances as the line
strainer will prevent ingress of foreign
materials, however if flushing is required,
run at least 50 litres of water from the
cylinder at the highest possible flowrate.
Close the taps and follow draining
procedure above.
6. ELECTRICAL INSTALLATION
6.1 Immersion heaters
Power to immersion heaters should not
be switched on until the unit is filled with
water. All units are fitted with one 3 kW
immersion heater which is located behind
the electrical box. Immersion heaters
must be wired through the factory fitted
thermostat and thermal cut-out according
to diagram on the reverse of the electrical
box cover .
Alternative thermostats should not be used,
regulations require immersion heaters on
unvented cylinders to be connected with a
thermal cut-out. Recommended torque is
0,2 kp (20Nm). End terminal must not
exceed 10 mm
MAX
10 mm
6.1.1 Wiring for immersions
1 3
2 4
RESET
1 4
1 3
2 4
RESET
1
2
Y-
plan
syste
m
termina
l
Live
feed
Switched
live
Elemen
t
OSO
3kW
240V - 1
phase
6
9
IMMERSIO N
THERMOSTA T
CYLINDE R
THERMOSTA T
NL
Cable
Clamp
6.2 Wiring for immersions
Follow the wiring instructions connecting the
live, neutral and earth as indicated. The unit
must be permanently connected to the
electrical supply through a double-pole linked
switch with a minimum break capacity of 13
amps. All internal wiring is factory mounted.
Each immersion heater has a working
thermostat adjustable between 40°C - 70°C.

6.2 Wiring for immersions (cont)
A safety cut-out is also incorporated within
the thermostat and will operate at 85°C ±
3°C. Should this happen, check reasons
for thermal cut-out button being released
and when satisified press the reset button
Important: Before resetting the safety cut-
out or altering the thermostat setting,
isolate electrical supply to the unit prior to
removal of the lid. Ensure the lid to the
electrical box is replaced correctly and the
retaining screw is fitted
6.3 System wiring
Motorised valve: To comply with
regulations governing the installation of
indirect unvented cylinders, a motorised
valve must be fitted in the primary
pipework.
The wiring plan shown is based on the use
of a 10-way Junction Box (Honeywell Part
no. 42002116-001) terminal 10 is switched
live and, if needed, terminal 9 is pump live.
Your OSO unit has been supplied with a two
port motorised valve, which will act as a
positive energy cut-out should the safety cut-
out operate.
The motorised valve will also control the
temperature of the domestic stored water via
the cylinder thermostat, which is located in
the electrical box. The unit should be
installed on an “S” or “Y” plan system. Please
follow the wiring instructions carefully.
The working thermostat which controls the
temperature of the domestic hot water is
adjustable between 40°C - 70°C. A safety
cut out is also incorporated within the
thermostat and will operate at 85°C ± 3°C.
Should the safety cut out be brought into
operation, the motorised valve will operate
and close down the primary flow to the
cylinder. To reset the safety cut-out and the
motorised valve the reset button must be
pressed in. If using a 6-wire 28mm or 1” BSP
V4043H on either circuit the white wire is not
needed and must be made electrically safe.
Basic Boiler L E N L N E
BOILER PUMP
10 8 3 2 1 10 8 2 3

2 Port Valve
(supplied)
Pump
flow
Auto-
matic
bypass
6.4 S plan wiring layout

2 Port Valve
(supplied)
Mid Position Valve
(not supplied)
Pump
flow
Automatic bypass
6.5 Y Plan wiring layout
A Honeywell 10 way Junction Box must be used in a Y plan system. No
other wiring centre is acceptable.

7. SAFETY AND SERVICING
Maintenance must be carried out by a
competent person.
7.1 Safety Cut-out
1. The safety cut-out operates if:
a. Wiring is incorrect.
b. The immersion heater thermostat or cylinder
thermostat fails.
2. Remember before resetting the safety cut-out or
altering the thermostat setting, isolate electrical
supply to the unit prior to removal of the
electrical
box lid.
3. Reduce thermostat setting and press the reset
button. After adjustments are completed, ensure
the lid to the electrical box is replaced correctly
and the retaining screw is fitted
4. If still out of operation, contact installer.
7.2 Intermittent or slow discharge from tundish
1. Turn off the electrical supply to the immersion
heaters.
2. Turn off cold water supply valve.
3. Open a hot tap.
4. Turn the knob on the Temperature and
Pressure relief valve (5) to the left and hold in
this position for thirty seconds
5. Check pre-charge on vessel and adjust
pressure if necessary
6. Open cold water supply valve.
7. When water flows through open tap, close tap 9
Turn on electrical supply to the immersion heaters
7.3 Continous very hot water discharge from
tundish
This indicates a malfunction of a thermal cut-out,
operating thermostat or the combined temperature
and pressure relief valve. Turn off the electrical
supply to the immersion heater and also isolate an
indirect unit from the boiler. Contact the installer or
competent engineer.
7.4 Expansion vessel maintenance (cont)
unless an intermittent or slow discharge from
the tundish occurs when water is being
heated. In this situation, maintenance must
be carried out by competent person and the
precharge pressure must be restored to the
original value. An annual visual inspection is
recommended. Important: To check the
precharge the expansion vessel must be
completely empty of water. If the precharge
pressure is different from the value shown on
the label it must be restored to the original
value. Do not remove expansion vessel
without depressurizing the cylinder and
draining 10 litres of water from the drain
valve at the base of the cylinder.
7.4 Expansion vessel maintenance
The expansion vessels do not require annual
maintenance and should not be tampered with
7.5 Guarantee
Cylinder should be serviced annually and
benchmark logbook should be updated in
order to validate guarantee. Logbook and
service records act as guarantee document.
For terms of guarantee please see Service
logbook on page ??
7.6 Service Procedure
The following maintenance work has to be
carried out annually by a competent person.
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6. Check the expansion vessel charge with a
pressure gauge at the test point.
7. If the pressure is below 3.0 bar, top up with
suitable air pressure pump.

7.6 Service Procedure
8. Complete the service section of Benchmark/
Cylinder Commissioning Checklist included
in the inside back pages of these
instructions.
9. Remove , clean and replace line strainer.
10. The immersion heater element must be
removed for inspection on service after 5
years. The threads must be checked for
corrosion. If signs of corrosion are evident,
the element must be replaced.
Subsequently the element must be
removed and examined every 3 years.
Failure to do so in areas of aggressive
water may result in the element separating
from the cylinder with consequential escape
of water.
11. Visual inspection of all external valves and
fittings.
7.6 Combination valve
The combination valve can be separated into
two sections by disconnecting the
compression fitting in the middle. The entire
valve can be removed by unscrewing from the
top connection. When refitting, the valve does
not tighten, the seal is created by a double
Oring.
To create the seal, the valve should be
wound down until it will not go any further, then
wound back up less than one full turn to point
in the desired direction.
7.7 Drain cock
To remove drain cock, drain cylinder fully.
When cylinder has drained, unscrew rear
locking ring behind drain cock (turn clockwise).
Pull drain cock off. Reverse procedure to refit
drain cock. Locking ring only needs to be hand
tight, seal comes from double o-ring.
Alternative Discharge
Discharge pipes should be in metal and
dedicated to the unvented cylinder. The
pipe should have a continuous fall and
should terminate in a safe and visible
place.Downward discharges at low level,
i.e. up to 100 mm above external
surfaces such as car parks, hard
standings, grassed areas etc. are
acceptable providing that where children
may play or otherwise come into contact
with discharges, a wire cage or similar
guard is positioned to prevent contact,
whilst maintaining visibility. Discharge at
high level, i.e. into a metal hopper and
metal down pipe with the end of the
discharge pipe clearly visible (tundish
visible or not) or onto a roof capable of
withstanding high temperature
discharges of water and 3 m from any
plastics guttering system that would
collect such discharges (tundish
visible).Where a single pipe serves a
number of discharges, such as in blocks
of flats, the number served should be
limited to not more than 6 systems so
that any installation discharging can be
traced reasonably easily. The single
common dis-charge pipe should be at
least one pipe size larger than the
largest individual discharge pipe to be
connected.
For further information contact your
Building Control Office

8. OSO FAULT FINDING GUIDE

9. Technical and Performance specifications

19
The code of practice for the installation,
commissioning & servicing of mains pressure hot water storage
Installation,Commissioning
and Service Record Log Book
CUSTOMER DETAILS
NAME
ADDRESS TEL No.
IMPORTANT
1. Please, keep the Log Book in a safe place for future reference.
2. This Log Book is to be completed in full by the competent person(s) who
commissioned the equipment and then handed to the customer. When this is done,
the Log Book is a commissioning certificate that can be accepte as evidence of
compliance with the appropriate Building Regulations.
3. Failure to install and commission this appliance to the manufacturer’s
instructions may invalidate the guarantee.
The above does not affect your statutory rights.
For full details on the HWA charter please visit http://www.hotwater.org.uk/
© HEATING AND HOTWATER INFORMATION COUNCIL
IT IS THE RESPONSIBILITY OF THE INSTALLER TO COMPLETE THIS
LOG BOOK AND PASS IT ON TO THE CUSTOMER. FAILURE TO DO
SO MAY INVALIDATE THE CYLINDER GUARANTEE
HWA charter members agree to:
• To supply fit for purpose products clearly and honestly describe
• To supply products that meet, or exceed appropriate standards and building and water regulations
• To provide pre and post sales technical support
• To provide clear and concise warranty details to customers

20
1 Scope
OSO Hotwater UK Ltd. (hereinafter called OSO) warrants for 2 years from the date of purchase, that the Product will: i) conform to
OSO specification, ii) be free from defects in materials and workmanship, subject to conditions below. All components carry a 2-
year warranty.
The warranty is voluntarily extended by OSO to 25 years for the stainless steel inner tank under the conditions stated below. This
extended warranty only applies to distributed by OSO or by a distributor where the Products have been originally sold by OSO.
2. Coverage
If a defect arises and a valid claim is received within the statutory warranty period, at its option and to the extent permitted by law,
OSO shall either; i) repair the defect, or; ii) replace the product with a product that is identical or similar in function, or; iii) refund
the purchase price.
If a defect arises and a valid claim is received after the statutory warranty period has expired, but within the extended warranty
period, OSO will supply a product that is identical or similar in function. OSO will in such cases not cover any other associated
costs. In addition, for every year after the statutory warranty period, the claimant must contribute 4 % of the list price of the
cylinder in question to OSO.
Any exchanged Product or component will become the legal property of OSO. Any valid claim or service does not extend the
original warranty. The replacement Product or part does not carry a new warranty.
3. Conditions
The Product is manufactured to suit most public water supplies. However, there are certain water chemistries (outlined below) that
can have a detrimental effect on the Product and its life expectancy. If there are uncertainties regarding water quality, the local
water supply authority can supply the necessary data.
The warranty applies only if the conditions set out below are met in full:
- The Product has been installed by a professional installer, in accordance with the instructions in the installation manual and all
relevant Codes of Practice and Regulations in force at the time of installation.
- The Product has not been modified in any way, tampered with or subjected to misuse and no factory fitted parts have been
removed for unauthorized repair or replacement.