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Model Selection
The suggested model sizes shown in the tables
opposite 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 fully charged to at least 75°C by the main
heat source.
When selecting a solar model, it is important
to check the dedicated solar volume (shown in
table on pages 4-5) complies with the Building
Regulations ADL1 Domestic Building Services
Compliance Guide.
The suggested model sizes are based on
typical hot water usage. For high specification
dwellings an increase of one model size should
be considered.
Please see page 18 for pipework configuration
where Torrent Stainless SP SOL is selected and
both coils are to be used with a boiler.
General Design Considerations
As a general rule, the cupboard footprint needs
to be a minimum of 150mm wider, 80mm
deeper and 80mm taller than the unit selected.
to accommodate the plate heat exchanger and
associated pipework.
The base chosen for the Torrent Stainless should
be level and capable of supporting the weight of
the unit when full of water as shown in General
Data.
General Restrictions
a. Bidets incorporating an ascending spray
inlet, or using a flexible hose or arranged
with a spray or jet are a fluid category 5 risk.
These should not be used with the Torrent
Stainless when it is also serving other outlets.
b. Torrent Stainless should not be used where
steam is the primary heating medium.
The figures above are to be used where there is only a sealed system boiler connected,
and both boiler and solar coils are connected to the boiler.
Torrent Stainless OV Model Selection Guide
Max hot water demand
Bedrooms
Model
1 bathroom
1 - 2
TST150OV
1 ba en-suite shower
2 - 3
TST180OV
2 bat en-suite shower
2 - 3
TST210OV
2 bat 2 en-suite showers
3 - 4
TST250OV
3 bat 2 en-suite showers
4 - 5
TST350OV
Torrent Stainless SP SOL Model Selection Guide (Boiler Only)
Max hot water demand
Bedrooms
Model
1 bathroom
1 - 2
TST150SPSOL
1 ba en-suite shower
2 - 3
TST180SPSOL
2 bat en-suite shower
2 - 3
TST210SPSOL
2 bat 2 en-suite showers
3 - 4
TST250SPSOL
3 bat 2 en-suite showers
4 - 5
TST350SPSOL
Mains Water Supply
A typical arrangement of the hot and cold water system is shown below. The PHE on all
Torrent Stainless models are designed to be fed directly from the mains water supply
and they fulfil the requirements of WRAS Schedule 2 (paragraph 15.2), and therefore
do not require a check valve to be fitted to the cold water supply pipe.
The performance of the Torrent Stainless 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.
The Torrent Stainless 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 3.0 bar.
If the incoming static mains pressure exceeds 5.0 bar 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.
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 EN 8558:2011. This could be up to 50 l/min in some properties.
The sanitary water 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 Water Supply (Water Fittings) Regulations 1999.
Torrent Stainless SP SOL Model Selection Guide
Max hot water demand
Max solar
collector
area (m
2
)
Bedrooms
Model
1 bathroom
2.22
1 - 2
TST150SPSOL
1 bathroom
2.54
2 - 3
TST180SPSOL
1 ba en-suite shower
2.91
2 - 3
TST210SPSOL
2 bat en-suite shower
3.88
3 - 4
TST250SPSOL
2 bat 2 en-suite showers
4.64
4 - 5
TST350SPSOL
Torrent Stainless OV SOL Model Selection Guide
Max hot water demand
Max solar
collector
area (m
2
)
Bedrooms
Model
1 bathroom
2.22
1 - 2
TST150OVSOL
1 bathroom
2.54
2 - 3
TST180OVSOL
1 ba en-suite shower
2.91
2 - 3
TST210OVSOL
2 bat en-suite shower
3.88
3 - 4
TST250OVSOL
2 bat 2 en-suite showers
4.64
4 - 5
TST350OVSOL
INSTALLATION
INSTALLATION
INSTALLATION
INSTALLATION
TYPICAL HOT AND COLD DISTRIBUTION
Check valve NOT REQUIRED unless
supply pipe services more than one dwelling
Check valve NOT REQUIRED unless scale inhibitor is a chemical type.
In any event, do not fit a check valve down stream of this point (see 5.1.9)
Pressure limiting valve
(Not required unless mains pressure is greater than 5 bar)
Supply
pipe
Second dwelling
Sink
Scale inhibitor
(where necessary)
Bath
H.B.
W.C.
BS1212
Ballvalve
Hot and Cold Distribution Pipe Arrangement - All Models
Taps and Shower Fittings
Aerated taps are recommended to prevent
splashing.
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
thermostatic showers are now no more
expensive than manual showers, we strongly
recommend thermostatic showers with Torrent
Stainless. The shower head provided must also
be suitable for mains pressure supplies.
The hot water supply to a shower-mixing valve
should be fed where practical directly from the
Torrent Stainless 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.
The shower must incorporate or be fitted with the
necessary check valves to prevent back-syphonage
protection in accordance with Water Regulations.
Bidets in domestic locations of the over rim
style, that have no ascending spray or spray
and/or flexible hose may be supplied by the
Torrent Stainless, providing that a type AUK2
air gap is maintained between the outlet of the
water fitting and the spill over level of the bidet.
Summary of Contents for Torrent Stainless OV
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