gledhill TORRENT DIRECT User guide

Design, Installation
& Servicing Instructions
All models comply with the HotWater Association
specification for thermal stores
Please leave these instructions adjacent
to the appliance
A total hot water and heating
thermal store that can also make
the most of renewable energy

Page 2
CONTENTS
Building Regulations and Benchmark Commissioning
TheBuildingRegulations (England &Wales)requirethatthe installation of aheating
appliance be notified to the relevant Local Authority Building Control Department.
From 1st April 2005 this can be achieved via a Competent Person Self Certification
Scheme as an option to notifying the Local Authority directly. Similar arrangements
will follow for Scotland and will apply in Northern Ireland from 1st January 06.
CORGI operates a Self Certification Scheme for gas heating appliances.
Thesearrangementsrepresentachangefromthesituationwherebycompliancewith
theBuildingRegulationswasacceptediftheBenchmarkLogbookwascompletedand
this was then left on site with the customer.
Withtheintroductionofaselfcertificationscheme,theBenchmarkLogbookisbeing
replacedbyasimilardocumentintheformofacommissioningchecklistandaservice
interval record is included with all gas appliance manuals. However, the relevant
Benchmark Logbook is still being included with all Thermal Storage products and
unvented cylinders.
Gledhill fully supports the Benchmark aims to improve the standards of installation
andcommissioningofcentralheatingsystemsintheUKandtoencouragetheregular
servicing of all central heating systems to ensure safety and efficiency.
Building Regulations require that the heating installation should comply with the
manufacturer’s instructions. It is therefore important that the commissioning check
listiscompletedbythecompetentinstaller.Thischecklistonlyappliestoinstallations
in dwellings or some related structures.
AWRASlistedproductdevelopedbyGledhill BuildingProductsin the1980’sin
conjunction with British Gas plc.
British patent nos.1358166,2136099
British patent applications published under nos. 2136099, 2153503, 2153504,
8516025
This product is manufactured under an ISO 9001:2008 Quality System audited
by BSI.
Gledhill’s first priority is to give a high quality service to our customers.
Quality is built into every Gledhill product and we hope you get satisfactory
service from Gledhill.
If not please let us know.
Theseinstructionsshouldbereadinconjunction
withtheInstallationandServicingInstructions
issuedbythemanufacturersoftheheatsource
e.g. the boiler used.
Any water distribution and central heating
installation must comply with the relevant
recommendations of the current version of the
RegulationsandBritishStandardslisted below:-
Gas Safety Regulations
Building Regulations
I.E.E. Requirements for Electrical Installations
Water Regulations
British Standards
BS6798, BS5449, BS5546, BS5440:1, BS5440:2,
CP331:3, BS6700, BS5258, BS7593:1993 and
BS7671.
It must be installed by a competent person as
stated in the Gas Safety Regulations.
Manufacturers notes must NOT be taken as
over-riding statutory obligations.
Torrent is not covered by Section G3 of the
currentBuildingRegulationsbuttheinstallation
is notifiable to building control unless it is
carried out under an approved competent
person self-certification scheme.
Although the secondary supply (domestic) is
at mains pressure, it is not necessary to fit an
expansionchamber,pressureortemperaturerelief
valve,theplumbingshouldallowanyunusualbuild
upofpressuretoberelievedattheballvalve.
The information in this manual is provided to
assistgenerallyintheselectionofequipment. The
responsibilityfortheselectionandspecification
oftheequipmentmusthoweverremainthat of
thecustomerandanyDesignersorConsultants
concernedwiththedesignand installation.
Please Note: We do not therefore accept any
responsibility for matters of design, selection
or specification or for the effectiveness of an
installation containing one of our products
unless we have been specifically requested
to do so.
Allgoods aresold subjectto ourConditions
of Sale and Warranty Terms, which are set
out at the rear of this manual.
In the interest of continuously improving
the Torrent range, Gledhill Building Products
Ltd reserve the right to modify the product
without notice, and in these circumstances
thisdocument,whichisaccurateatthetimeof
printing,shouldbedisregarded. Itwillhowever
beupdatedassoonaspossibleafterthechange
has occurred.

Page 3
ISSUE 2:06-10
INDEX
INDEX
1 DESCRIPTION
1.1 Torrent Direct
1.2 Torrent Indirect-SP
1.3 Torrent Indirect-OV
1.4 Torrent RE-Solar
1.5 Torrent Combi-Preheat
1.6 Torrent HP Range
2 MODEL SELECTION GUIDE AND TECHNICAL DATA
2.1 Model selection guide
2.2 Factory fitted and optional equipment
2.3 Technical data
3 COLD AND HOT WATER DISTRIBUTION NETWORK DESIGN
3.1 General
3.2 Use in hard water areas and scale prevention
3.3 Materials
3.4 Taps/Shower fittings
3.5 Hot and cold water supply pipe lengths
3.6 Water flow noise and water hammer
4 HEATING SYSTEM DESIGN
4.1 Ball valve and overflow
4.1.1 Torrent Direct models
4.1.2 Torrent Indirect and RE models
4.2 Water treatment
4.3 Torrent Direct system design
4.4 Torrent Indirect and Torrent RE-Solar heating system design
4.4.1 General
4.4.2 Pipe sizing and materials – heating system
4.4.3 Boiler size
4.4.4 Open vented heating system
4.4.5 Sealed heating system
4.5 Solar heating systems
4.5.1 General
4.5.2 Torrent Direct – Solar
4.5.3 Torrent RE-Solar
4.6 Other renewable energy sources
5 INSTALLATION
5.1 General
5.2 Torrent Direct
5.3 Torrent Indirect and Torrent RE-Solar
5.4 Solar heating – Torrent RE and Torrent Direct-solar
5.5 Other renewable energy sources
6 COMMISSIONING
6.1 Torrent Direct models
6.2 Non-Electric Torrent models
6.3 Important Do’s and Don’ts
7 FAULT FINDING
7.1 Torrent direct-electric models
7.2 All other Torrent models
8 PARTS
9 Terms & conditions

Page 4
DESCRIPTION
TORRENT DIRECT / INDIRECT OV
Gledhill developed the principle of domestic thermal stores starting in 1982 and they have been
manufacturing them in ever larger numbers since then. They are particularly important to the
design of the systems in two main areas: -
(a) Apartments – Where the discharge from the pressure and temperature relief valves on the
unvented cylinders could be a problem. Because this product does not require a safety
discharge from a temperature and pressure relief valve, any installation will be easy to
incorporate into the building and will not suffer the problems facing unvented cylinders
now that discharges into PVCu soil stacks are not permitted.
(b) Alternative energy – Where a primary a thermal store can be heated by a solid fuel and/or
heat pump and or solar thermal system without the risk of legionella or the risks
associated with high temperature and pressures. The secondary water volume is so small
that the “dwell time” is tiny which is the reason why there is virtually no legionella risk
unlike a storage vessel.
Torrent range of primary thermal stores are designed to provide mains pressure hot water without
the additional safety requirements of a pressure and temperature relief valve. Therefore, unlike
with the unvented cylinder, the notification to the Building Control to comply with section G3 of
the Building Regulations is not required. This is because the thermal store is vented in the normal
way and the mains pressure hot water is heated instantaneously by means of heat exchangers
inside the thermal store as shown in figures 1.1 – 1.5. The domestic hot water heat exchanger
contains its own self replenishing expansion chamber to absorb the expansion of the domestic
hot water inside the appliance.
Unlike unvented storage cylinders, the Torrent range of mains pressure hot water units require no
annual maintenance or inspection. This reduces the running cost for the home owner while
offering high performance showers and high flow rates to fill baths rapidly.
The Torrent model selection guidance is summarised in table 2.1 and the Torrent range is
available in the following basic variants: -
1.1 TORRENT DIRECT
Torrent Direct is an electrically heated, fully packaged mains pressure hot water appliance which
incorporates a feed and expansion cistern as shown in figure 1.1. Therefore it eliminates the
problems associated with a cold water cistern in the roof space. It is supplied complete with two
low watts density immersion heaters for extra quiet operation which are BEAB approved for
safety.
A Torrent Direct-Solar model shown in figure 1.2, is also available for use with a solar thermal
water heating system. The technical data of the Torrent Direct models is listed in table 2.3 in
section 2.
1.2 TORRENT INDIRECT-OV
Torrent Indirect-OV shown in figure 1.3 is a vented primary thermal store that is designed for use
with either a gas or an oil boiler and it provides mains pressure domestic hot water. The primary
thermal store (i.e. the cylinder) of the Torrent Indirect-OV is heated directly by the boiler and
therefore it is only suitable for open vented heating systems.
The primary hot water in the Torrent Indirect-OV models is used for producing domestic hot water
and is also circulated through the central heating circuit for rapid heating of the dwelling.

Page 5
TORRENT INDIRECT SP / RE SOLAR / COMBI PREHEAT
DESCRIPTION
The Torrent Indirect-OV models can be plumbed using the traditional ‘Y’ or ‘S’ plan control
arrangements or alternatively, the central heating can be supplied using a separate pump directly
from the store as described in section 4 of this manual. The technical data of the Torrent Indirect-
OV models is presented in table 2.4 in section 2.
1.3 TORRENT INDIRECT-SP
Torrent Indirect-SP is a vented primary hot water store i.e. the cylinder is designed for use with a
gas or an oil boiler and provides mains pressure domestic hot water (figure 1.4). Like all other
Torrent models, the domestic hot water is heated instantaneously by means of internal heat
exchangers. The primary thermal store of the Torrent Indirect-SP is heated indirectly by means of
a primary heat exchanger (primary coil) and is used for heating domestic hot water only.
The Torrent Indirect-SP is primarily designed for use with sealed primary heating but it can be
used for open vented systems provided separate cold feed and open vent are used for the
heating circuit. The Torrent Indirect-SP models can be plumbed using the traditional ‘Y’ or ‘S’
plan control arrangements as described in section 4 of this manual. The technical data of this
range is listed in table 2.5 in section 2.
1.4 TORRENT-RE – FOR USE SOLAR / WOOD BURNING STOVE / AGA
The Torrent-RE-Solar is based on the well proven, tried and tested Torrent range of thermal
stores described above. It is designed for use with solar thermal systems in combination with a
gas or an oil boiler. In addition to this, the Torrent-RE-Solar can also be connected to other
renewable energy heat sources e.g. wood burning stove, AGA. The connections for wood burning
stove and any additional connections for other heat sources or additional heating circuits can be
specified when placing the order.
All Torrent-RE-Solar models are available for use in traditional open vented (OV) heating systems
as shown in figure 1.5 or with an additional primary (boiler) heat exchanger for use in a sealed
primary (SP) heating systems as shown in figures 1.6. However in both cases the thermal store
is always open vented so that other renewable heat sources can be connected to it safely. In both
variants, the solar panels heat the store by means of a solar heat exchanger inside the store.
In the Torrent-RE-Solar OV models, the thermal store is heated directly by the boiler and/or the
wood burning stove (if fitted) and the central heating is supplied from the thermal store. In the
Torrent-RE-Solar SP models, the thermal store is heated indirectly by the boiler and directly by
the wood burning stove (if fitted) and the central heating is supplied directly from the boiler
circuit. The technical data of these models is listed in tables 2.6 and 2.7 in section 2.
1.5 TORRENT COMBI-PREHEAT
This Torrent variant is designed to provide solar pre-heated mains pressure hot water to a
combination boiler without the risk of legionella. The thermal store is heated either directly (e.g. a
drain back system) or indirectly by my means of an internal solar heat exchanger i.e. a
pressurised solar circuit). In both types, the thermal store is open vented. Horizontal models are
available for use in a loft space with restricted height.
A typical system configuration of solar heating system designed to provide pre-heated mains
pressure hot water to a combination boiler is shown schematically in figure 1.7. The technical
specification of the Torrent Combi-preheat models is shown in table 2.8 in the specification
section 2 of this manual.

Page 6
DESCRIPTION
UNIT DIAGRAMS
1.6 TORRENT HP RANGE
Gledhill produce storage vessels specifically designed for use with heat pumps. Please ask for
Torrent HP / Stainless Lite HP literature or visit our website www.gledhill.net. Our heat pump
range includes: -
(a) Torrent-HP: These are primary thermal stores of up to 450 litre capacity and designed for
use with heat pumps. It provide mains pressure domestic like the standard Torrent but
with solar and wood burning stove options.
(b) Stainless Lite HP: These are unvented cylinders with up to 400 litre capacity and with
enhanced primary heat exchangers and some models have solar option.
(c) Stainless Lite BS: These are stainless steel buffer stores of up to 400 litre capacity.
These are designed for use in large domestic and commercial heat pump circuits with
operating pressures up to 3.0bar.
Figure 1.1 Torrent Direct
Off Peak
Immersion heater
On Peak (Boost)
Immersion heater
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Solid Fuel Flow Store Overheat
Immersion Heater
Immersion Heater
Solid Fuel Return
Top DHW
Top DHW
Bottom DHW
Cold Feed
Cylinder Drain
Bottom DHW
Vent
Please note Figures 1.1 to 1.7 are shown schematically only

Page 7
UNIT DIAGRAMS
DESCRIPTION
Figure 1.2 Torrent Direct-Solar
Off Peak
Immersion heater
On Peak (Boost)
Immersion heater
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Solar heating return
Solar heating Flow
Solar controller sensor pocket
Solid Fuel Flow
Immersion Heater
Immersion Heater
Solar Flow
Solar Return
Solar Sensor
Solid Fuel Return
Overheat Sensor
Top DHW
Top DHW
Bottom DHW
Bottom DHW
Cold Feed
Middle DHW
Middle DHW
Vent
Cylinder Drain
Figure 1.3 Torrent Indirect-OV
Central heating return
Immersion heater
(Optional)
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Boiler return
Boiler flow
Central heating
flow
Wood burning stove
Flow (Optional)
Wood burning stove
Return (Optional)
Store thermostat
Vent
Solid Fuel Flow Store Overheat
ITC Stat
Immersion Heater
Primary Flow
Boiler Return
Boiler Flow
Solid Fuel Return
Top DHW
Top DHW
C/H Flow
Bottom DHW
Cold Feed
Bottom DHW
C/H Return
Cylinder Drain

Page 8
DESCRIPTION
UNIT DIAGRAMS
Figure 1.5 Torrent RE-Solar-OV
Solid Fuel Flow Store Overheat
ITC Stat
Boiler Flow
Boiler Return
Solar Flow
Solar Return
Solar Sensor
Top DHW
Top DHW
Bottom DHW
Bottom DHW
C/H Return
C/H Flow
Solid Fuel Return
Cold Feed
Immersion Heater
Vent
Cylinder Drain
Immersion heater
(Optional)
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Solar return
Solar Flow
Wood burning stove
Return (Optional)
Store thermostat
Wood burning stove
Flow (Optional)
Under-floor heating
return (Optional)
Under-floor heating
flow (Optional)
Boiler flow
Central heating flow
Central heating return
Boiler return
Solar controller
sensor pocket
Overheat sensor
/ thermostat pocket
Figure 1.4 Torrent Indirect-SP
Immersion heater
(Optional)
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Boiler return
Boiler Flow
Wood burning stove
Return (Optional)
Store thermostat
Wood burning stove
Flow (Optional)
Vent
Solid Fuel Flow Store Overheat
ITC Stat
Immersion Heater
Primary Flow
Primary Return
Solid Fuel Return
Top DHW
Top DHW
Bottom DHW
Cold Feed
Bottom DHW
Cylinder Drain

Page 9
UNIT DIAGRAMS
DESCRIPTION
Figure 1.6 Torrent RE-Solar-SP
Immersion heater
(Optional)
Cold mains
inlet (22 mm)
Hot water outlet
(22 mm )
Adjustable thermostatic
Mixing valve
F & E Cistern
Solar return
Solar Flow
Wood burning stove
Return (Optional)
Store thermostat
Wood burning stove
Flow (Optional)
Under-floor heating
return (Optional)
Under-floor heating
flow (Optional)
Primary flow
Primary return
Solar controller
sensor pocket
Overheat sensor
/ thermostat pocket
Solid Fuel Flow Store Overheat
ITC Stat
Primary Flow
Primary Return
Solar Flow
Solar Return
Solar Sensor
Top DHW
Top DHW
Bottom DHW
Bottom DHW
Solid Fuel Return
Cold Feed
Immersion Heater
Vent
Cylinder Drain
Direct Boiler Flow
Direct Boiler Return
Boiler flow
Boiler return
Figure 1.7 Typical Torrent Combi-preheat system
Cold mains
inlet
HW outlet
Thermostatic
Mixing valve
F & E Cistern
Combi Boiler
To hot water
outlets
Solar panels
Solar
controller

Page 10
TECHNICAL DATA
MODEL SELECTION GUIDE
2.1 MODEL SELECTION GUIDE
The suggested model sizes shown in the table 2.1 are based on a typical daily hot water usage
and on the assumptions that the heating system is correctly sized and that the thermal store is
heated to at least 75oC by the main heat source. It is recommended that for higher specification,
an increase of one model size should be considered.
When selecting a Torrent-RE model, the following operating and the compliance requirement
parameters should also be taken into account: -
(a) The primary heat source (e.g. a boiler) will only heat about 65% of the store volume and
the remainder is designed to be heated by the solar thermal system. During the winter
period the solar contribution will be negligible and this should be taken into account when
selecting the Torrent-RE models.
(b) The solar heating systems and the associated equipment should comply with the ‘Building
Regulations’ and these requirements are specified in the ‘Heating system compliance
guide’. (See www.gledhill.net). The key requirements relevant to the model selection are: -
Either the total floor area, AD, of the dwelling should not be greater than the value
stated for the model in table 2.1 as illustrated by example 1 below; or the dedicated
solar volume for the model selected should not be less than the valve ‘25 x AP’; where,
AP, is the total net area of the solar panels in m2as illustrated by example 2 below.
Example 1:
The total floor area, AD, of the dwelling = 130m2.
Therefore from table 2.1, the smallest Torrent model that will comply with the
requirements will be T350RE.
Example 2:
Total net are of the solar panels, AP, to be installed = 3.0m2.
Therefore dedicated solar volume required = 25 x AP= 25 x 3.0 = 75 litres
Therefore from table 2.1, the smallest Torrent model that will comply with this
requirements will be T200RE.
The surface area of the solar heat exchanger of the Torrent-RE model selected should
not be less than the valve ‘0.1 x AP‘ for low flow rate solar panels ( < 0.5 l/min per m2)
or less than the value ‘0.2 x AP’ for high flow rate solar panels ( 0.5 l/min per m2);
where, AP, is the total net area of the solar panels in m2.
Example 3:
The net area, AP, of the solar panels = 2.5m2,
The manufacturers recommended flow rate, QSP, = 0.4 l/min per m2
Therefore, minimum surface area of solar heat exchanger required = 2.5x0.1 = 0.25m2
Example 4:
The net area, AP, of the solar panels = 3.5m2,
The manufacturers recommended flow rate, QSP, = 0.7 l/min per m2
Therefore, minimum surface area of solar heat exchanger required = 3.5 x 0.2 = 0.7m2

Page 11
EQUIPMENT /TECHNICAL DATA
TECHNICAL DATA
2.2 OPTIONAL EQUIPMENT
A high limit thermostat is available as an option.
2.3 TECHNICAL DATA
The physical and the technical data for the Torrent range covered by this manual presented in
tables 2.3 – 2.8. The reference notes for these tables are described below.
[1] The maximum dwelling floor area calculated using SAP 2005 procedure for compliance with
the Building Regulations 2000 relating to solar heating systems. For further guidance see
‘Heating system compliance guide’.
[2] The maximum net area of solar panels calculated at 25l/m2 of dedicated solar volume for
compliance with the Building Regulations relating to solar heating systems. For further
guidance see ‘Heating system compliance guide’.
[3] Pressure loss characteristics of the primary (boiler) heat exchanger measured at 0.25 l/s
flow rate as specified in BS 1566, BS EN 12897 and ‘Performance specification of thermal
stores’, an HWA publication.
[4] Pressure loss characteristics of the solar heat exchanger measured at 0.25 l/s flow rate as
BS EN 12897 and ‘Performance specification of thermal stores’, an HWA publication.
[5] Performance rating of the primary (boiler) heat exchanger measured using procedure
defined in the ‘Performance specification of thermal stores’, an HWA publication.
[6] Hot water performance measured at store charge temperature of 75oC, mains inlet pressure
of 2.0bar and the dhw mixing valve set at 55oC.

Page 12
TECHNICAL DATA
MODEL SELECTION GUIDE
Table 2.1 Torrent model selection guide
Suggested modelsDwelling type Bath rooms &
shower rooms Torrent Direct Torrent Direct - Solar Torrent Indirect
OV & SP RE-Solar
1 – 2 Bedrooms 1 bathroom T144 DE T210DE-RE
[1] ADup to 60 m2
[2] APup to 2.8 m2
T130IND T170RE :[1] For ADup to 55 m2
[2] For APup to 2.6 m2
2 – 3 Bedrooms 1 Bathroom
or
1 Shower room
T210 DE T130IND T170RE :[1] For ADup to 55 m2
[2] For APup to 2.6 m2
2 – 3 Bedrooms 1 Bathroom
and
1 shower room
T130IND T170RE : [1] For ADup to 55 m2
[2] For APup to 2.6 m2
T210RE : [1] For ADup to 70 m2
[2] For APup to 3.0 m2
2 – 4 Bedrooms 1 Bathroom
and
1 shower room
T170IND T200RE : [1] For ADup to 70 m2
[2] For APup to 3.0 m2
T280RE : [1] For ADup to 100 m2
[2] For APup to 3.8 m2
3 – 4 Bedrooms 2 Bathroom
and
1 shower room
T210IND T280RE : [1] For ADup to 100 m2
[2] For APup to 3.8 m2
T350RE : [1] For ADup to 160 m2
[2] For APup to 5.0 m2
3 – 5 Bedrooms 3 Bathrooms
and
2 Shower rooms
T350RE : [1] For ADup to 160 m2
[2] For APup to 5.0 m2
T450RE : [1] For ADup to 230 m2
[2] For APup to 6.1 m2
4 – 6 Bedrooms 5 bathrooms T450RE : [1] For ADup to 230 m2
[2] For APup to 6.1 m2

Page 13
STANDARD AND OPTIONAL EQUIPMENT
TECHNICAL DATA
Table 2.3 Technical data for the Torrent Direct models (Figures 1.1 & 1.2)
Model T144DE T210DE T210DE-RE
Nominal storage volume (capacity) [ litres ] 160 230 230 Overall dimensions: (Height x Diameter) Note: Includes F & E cistern [ mm ] 1650 x 550 1670 x 595 1670 x 595 Minimum cupboard size: (Width x Depth x Height) [ mm ] 700 x 600 x 1900 750 x 600 x 2120 750 x 600 x 2120 Weight: [ Empty / Full ] [ kg / kg ] 37 / 197 45 / 272 53 / 282 Volume heated by top immersion heater [ litres ] 70 90 60 Maximum working head - Store [ mWG ] 10.0 10.0 10.0 Mains cold water inlet pressure range [ bar ] 1.5 – 3.5 1.5 – 3.5 1.5 – 3.5 Hot water flow rate [4] [ litres/min ] 15 15 15 Heat loss factor [ kWh/24h ] 2.4 2.5 2.5 Dedicated solar volume [ litres ] 70 Area of the solar heat exchanger [ m2] 1.30 Maximum working pressure – solar heat exchanger [ bar ] 6.0 Maximum floor area of the dwelling [1] [ m2] 60.0 Maximum net area of the solar collector [2] [ m2] 2.8 Connections
- Cold feed - Open vent - Drain valve - Solar heat exchanger
22 mm, comp 22 mm, comp
R1/2”
-----
22 mm, comp 22 mm, comp
R1/2”
----
22 mm, comp 22 mm, comp
R1/2”
15 mm, comp
Off peak & On peak immersion heaters 2 off 3kW; 230Vac, 50Hz (Type 2)

Page 14
TECHNICAL DATA
TORRENT INDIRECT OV
Table 2.4 Technical data for the Torrent Indirect OV models for use with gas/oil boiler and open vented heating system
T130 IND-OV T170 IND-OV T210 IND-OV T250 IND-OV
Nominal storage capacity [ litres ] 135 176 216 256 Overall dimensions [ Includes F & E cistern ] Height x Diameter
[ mm ]
1545 x 520
1865 x 520
1835 x 570
2080 x 570
Minimum cupboard size
- Width x Depth x Height
[ mm ]
700 x 600 x
1880
700 x 600 x
2100
700 x 600 x
2200
700 x 600 x
2450
Weight [ Empty / Full ] [ kg / kg ] 30 / 157 37 / 204 38 / 243 46 / 288 Maximum working pressure
- Store (Open vented) - Heating system (Open vented)
[ mWG ] [ mWG ]
10.0 10.0
10.0 10.0
10.0 10.0
10.0 10.0
Mains cold water inlet pressure range [ bar ] 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 Hot water flow rate [4] [ l/min ] 18 18 25 25 Typical boiler size required 5] [ kW ] 10-15 15-20 20-25 25-30 Heat loss factor [ kWh/24h ] 2.8 2.9 2.9 3.0 Connections
- Cold feed - Open vent - Boiler flow & return - Central heating flow & return - Wood burning stove (optional) - Drain valve
22 mm 22 mm 22 mm 22 mm 28 mm
R1/2”
22 mm 22 mm 22 mm 22 mm 28 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm
R1/2”

Page 15
TORRENT INDIRECT SP
TECHNICAL DATA
Table 2.5 Technical data for the Torrent Indirect SP models for use with gas/oil boiler and sealed heating system
T130 IND-SP T170 IND-SP T210 IND-SP T250 IND-SP
Nominal storage capacity [ litres ] 135 176 216 256 Overall dimensions [ Includes F & E cistern ] Height x Diameter
[ mm ]
1545 x 520
1865 x 520
1835 x 570
2080 x 570
Minimum cupboard size
- Width x Depth x Height
[ mm ]
700 x 600 x
1880
700 x 600 x
2100
700 x 600 x
2200
700 x 600 x
2450
Weight [ Empty / Full ] [ kg / kg ] 36 / 163 43 / 210 46 / 251 54 / 296 Maximum working pressure
- Store (Open vented) - Heating system (sealed)
[ mWG ]
[ bar ]
10.0
3.5
10.0
3.5
10.0
3.5
10.0
3.5
Mains cold water inlet pressure range [ bar ] 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 Hot water flow rate [4] [ l/min ] 18 18 25 25 Typical boiler size required [5] [ kW ] 20 20 25 25 Heat loss factor [ kWh/24h ] 2.8 2.9 2.9 3.0 Connections
- Cold feed - Open vent - Boiler flow & return - Central heating flow & return - Wood burning stove (optional) - Drain valve
22 mm 22 mm 22 mm 22 mm 28 mm
R1/2”
22 mm 22 mm 22 mm 22 mm 28 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm
R1/2”
Primary (boiler) heat exchanger
- Maximum working pressure - Rating - Water content
[ bar ]
[ kW ]
[ litres ]
3.0
20
5.0
3.0
25
6.0
3.0
30
7.0
3.0
35
8.0

Page 16
TECHNICAL DATA
TORRENT RE OV
Table 2.6 Technical data for the Torrent RE-OV models for use with solar thermal, gas/oil boiler and open vented central heating
T170RE-OV T210RE-OV T280RE-OV T350RE-OV T450RE-OV
Nominal storage capacity [ litres ] 176 206 286 381 482 Dedicated solar volume [ litres ] 65 76 95 125 153 Maximum dwelling floor area [1] [ m2] 55 70 100 160 230 Maximum net area of solar panels [2] [ m2] 2.6 3.0 3.8 5.0 6.1 Overall dimensions [Includes F & E cistern ]
Height x Diameter
[ mm ]
1880 x 520
2135 x 520
2265 x 570
2265 x 680
2265 x 680
Minimum cupboard size
- Width x Depth x Height
[ mm ]
700 x 600 x
2150
700 x 600 x
2400
700 x 600 x
2500
700 x 700 x
2500
700 x 700 x
2500
Weight : Empty / Full [ kg / kg ] 45 / 210 49 / 244 61 / 326 75 / 425 85 / 535 Maximum working pressure (head)
- Store (Open vented ) - Central heating (Open vented)
[ mWG ]
[mWG]
10.0 10.0
10.0 10.0
10.0 10.0
10.0 10.0
10.0 10.0
Mains water inlet pressure range [ bar ] 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 Hot water flow rate [1] [ l/min ] 18 18 25 25 35 Typical boiler size required [2] [ kW ] 20 20 25 30 40 Heat loss factor [ kWh/24h ] 2.9 2.9 3.1 3.2 3.4 Connections
- Cold feed - Open vent - Boiler flow & return - Central heating flow & return - Wood burning stove - Solar flow & return - Drain valve
22 mm 22 mm 22 mm 22 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 22 mm 22 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 35 mm 35 mm 28 mm 28 mm
R1/2”
Solar heat exchanger - Maximum working pressure - Surface area - Water content
[ bar ]
[ m2]
[ Litres ]
6.0
1.31
3.0
6.0
1.31
4.0
6.0
1.74
5.0
6.0
1.74
6.0
6.0 2.2 6.0

Page 17
TORRENT RE SP
TECHNICAL DATA
Table 2.7 Technical data for the Torrent RE-SP models for use with solar thermal, gas/oil boiler and Sealed central heating
T170RE-SP T210RE-SP T280RE-SP T350RE-SP T450RE-SP
Nominal storage capacity [ litres ] 176 206 286 381 482 Dedicated solar volume [ litres ] 65 76 95 125 153 Maximum dwelling floor area [1] [ m2] 55 70 100 160 230 Maximum net area of solar panels [2] [ m2] 2.6 3.0 3.8 5.0 6.1 Overall dimensions [Includes F & E cistern ] Height x Diameter
[ mm ]
1880 x 520
2135 x 520
2265 x 570
2265 x 680
2265 x 680
Minimum cupboard size
- Width x Depth x Height
[ mm ]
700 x 600 x
2150
700 x 600 x
2400
700 x 600 x
2500
700 x 700 x
2500
700 x 700 x
2500
Weight : Empty / Full [ kg / kg ] 51 / 216 57 / 252 69 / 334 75 / 425 85 / 535 Maximum working pressure (head)
- Store (Open vented ) - Central heating
[ mWG ]
[ bar ]
10.0
3.5
10.0
3.5
10.0
3.5
10.0
3.5
10.0
3.5
Mains water inlet pressure range [ bar ] 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 Hot water flow rate [1] [ l/min ] 18 18 25 25 35 Typical boiler size required [2] [ kW ] 15-20 15-20 20-25 25-30 30-40 Heat loss factor [ kWh/24h ] 2.9 2.9 3.1 3.2 3.4 Connections
- Cold feed - Open vent - Boiler flow & return - Central heating flow & return - Wood burning stove flow & return - Solar flow & return - Drain valve
22 mm 22 mm 22 mm 22 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 22 mm 22 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 28 mm 28 mm 28 mm 22 mm
R1/2”
22 mm 22 mm 35 mm 35 mm 28 mm 28 mm
R1/2”
Primary heat exchanger - Maximum working pressure - Rating - Water content
[ bar ]
[ kW ]
[ litres ]
3.0
15
5
3.0
20
6
3.0
25
7
3.0
30
8
3.0
35 10
Solar heat exchanger - Maximum working pressure - Surface area - Water content
[ bar ]
[ m2]
[ Litres ]
6.0
1.31
3.0
6.0
1.31
4.0
6.0
1.74
5.0
6.0
1.74
6.0
6.0 2.2 6.0

Page 18
TECHNICAL DATA
TORRENT COMBI PREHEAT
Table 2.8 Technical data for the Torrent Combi-preheat models
T120 CP T150 CP T120 CP-H
Nominal storage capacity [ litres ] 130 170 130 Overall dimensions [ Includes F & E cistern ] Height x Diameter [ mm ]
TBA
TBA
TBA
Weight [ Empty / Full ] [ kg / kg ] TBA TBA TBA Maximum working pressure - open vented store [ mWG ] 10.0 10.0 10.0 Mains cold water inlet pressure range [ bar ] 1.5 – 3.0 1.5 – 3.0 1.5 – 3.0 Hot water flow rate [4] [ l/min ] 12 15 12 Heat loss factor [ kWh/24h ] 2.8 2.9 2.8 Connections
- Cold feed - Open vent - Solar circuit flow & return - Drain valve
15 mm 22 mm 15 mm
R1/2”
15 mm 22 mm 15 mm
R1/2”
15 mm 22 mm 15 mm
R1/2”

Page 19
GENERAL / HARDWATER AREAS
DESIGN
3.1 GENERAL
(a) A typical arrangement of the hot and cold water system is shown in figure 3.1. All Torrent
models are designed to be fed directly from the mains and they fulfil the requirements of
Water Bylaw 91, and therefore do not require a check valve to be fitted to the cold water
supply pipe.
(b) The performance of the Torrent is directly related to the cold water supply pressure and
volume to the dwelling. This must be capable of providing for all those services which
could be required simultaneously and the maximum demand should be calculated for
sizing the distribution network.
As a general guideline, although a 15mm external service may be sufficient for the
smaller dwelling with one bathroom, a 22mm service is preferred (25mm MDPE) and
should be the minimum for larger dwellings.
(c) The Torrent will operate at dynamic pressure as low as 1.5 bar (at the appliance) which
must be available when the local demand is at its maximum, but the preferred range is
between 2 and 3.5 bar.
If the incoming static mains pressure exceeds 3.5bar at any point in the 24 hour cycle,
then a pressure limiting valve set at 3.0 bar should be fitted downstream of the stop tap
where the cold supply enters the dwelling.
(d) If a water meter is fitted in the service pipe, it should have nominal rating to match the
anticipated maximum simultaneous hot and coldwater demand, calculated in accordance
with BS 6700. This could be up to 50 l/min in some properties.
(e) The equipment used in the system should be suitable for a working pressure of 10 bar and
the units must be fitted strictly in accordance with the requirements of the Local Water
Undertaking and the relevant Water Bylaws.
3.2 USE IN HARD WATER AREAS AND SCALE PROTECTION
The patented design of the domestic hot water heat exchanger is such that the turbulence
through the coil slows down the formation of the scale in moderate hard water conditions.
However, the requirements set out in the ‘Domestic Heating Compliance Guide’ and the Building
Regulations approved documents L1A and L1B regarding scale protection should be complied
with.
These requirements state that; “where the mains water hardness exceeds 200ppm provision
should be made to treat the feed water to the water heaters and the hot water circuit of
combination boilers to reduce rate of accumulation of scale”. To comply with this requirement: -
(a) The hardness of the mains water should be checked by the installer and if necessary
suitable in-line scale inhibitor device should specified for hardness levels between 200
and 300ppm (mg/l).
(b) Where the hardness level is 300ppm (mg/l) and above, the optional phosphate type
inhibitor should be specified and fitted at a suitable point in the cold water supply to the
appliance.
It is important that where the supply to the Torrent is in 22mm the in-line scale inhibitor is
also 22mm. In practice servicing is not normally required but in hard water areas, the
requirements can be considered similar to those needed for instantaneous or ‘combi’
appliances.
The installation of scale inhibitor should be in accordance with the manufacturers
instructions and Water Byelaws.

Page 20
DESIGN
MATERIALS /TAPS & SHOWER FITTINGS
3.3 MATERIALS
All the recommendations with regard to the heating systems in this manual are generally based
on BS/EN Standard copper pipework and fittings. However plastic pipework system can be used
in place of copper as long as the:-
(a) The chosen system is recommended for use in domestic heating systems by the
manufacturers and it is installed fully in accordance with their recommendations.
(b) The design criterion of the plastic system is at least equivalent to the use of BS/EN
Standard copper pipework and fittings.
(c) The barrier pipework for these systems is recommended.
3.4 TAPS/SHOWER FITTING
(a) Aerated taps are recommended to prevent splashing.
(b) All types of shower mixing valves can be used as long as both hot and cold supplies are
mains fed. However all mains pressure systems are subject to dynamic changes
particularly when other hot and cold taps/showers are opened and closed, which will
cause changes in the water temperature at the mixed water outlet such as showers. For
this reason and because the thermostatic showers are now no more expensive than the
manual showers, we strongly recommend thermostatic showers with Torrent. The shower
head provided must also be suitable for mains pressure supplies.
(c) The hot water supply to a shower-mixing valve should be fed where practical directly from
the Torrent or be the first draw-off point on the hot circuit. The cold water supply to a
shower-mixing valve should where practical be fed directly from the rising mains via an
independent branch.
(d) The shower must incorporate or be fitted with the necessary check valves to prevent back-
syphonage protection in accordance with Water Regulations.
(e) The supply of hot and cold mains water directly to the bidet is permitted provided that it is
of the over-rim flushing type and that type ‘A’ air gap is incorporated.