Greenstar Xtra Flue Gas Heat Recovery Unit

Greenstar Xtra Flue Gas Heat Recovery Unit
Greenstar Xtra
Flue Gas Heat
Recovery Unit
NEW
Save energy and reduce
CO2 emissions with the
Greenstar Xtra FGHR unit
Understanding the need for specifiers and house
builders to have a cost effective method of achieving
SAP target emission rates, Worcester has introduced
the Greenstar Xtra Flue Gas Heat Recovery (FGHR)
unit.
How the FGHR works
The unit is connected directly to the flue of the Greenstar boiler. Its
highly efficient plate heat exchanger extracts residual energy from
the flue gases exiting from the boiler. This energy is then used to
pre-warm the water that is fed into the combi boiler reducing the
amount of gas required to reach the desired hot water temperature.
The table below highlights the positive impact that the specification of
an Greenstar Xtra FGHR unit can have on a property’s SAP assessed
Dwelling Emission Rate (DER), allowing the example Target Emission
Rate (TER) to be met and exceeded.
TER
DER
% Difference
from TER
Worcester CDi Compact
19.47
20.19
-3.70
Worcester CDi Compact + Xtra
19.47
19.45
0.10
Worcester Si Compact
19.47
19.93
-2.36
Worcester Si Compact + Xtra
19.47
19.21
1.33
Worcester Greenstar i
19.47
19.83
-1.85
Worcester Greenstar i + Xtra
19.47
19.11
1.85
SAP 2012 calc based on: top floor flat (3 bed) – 63m²
Cavity wall – 0.25 W/m².K; Roof – 0.10 W/m².K; Floors – 0.12 W/m².K; Openings – 1.4 W/m².K ; Accredited
thermal bridges
q50 – 5; 3 intermittent fans; Standard programmer, room thermostat and TRV with radiators
Compact design
The Greenstar Xtra incorporates a compact design to assist installation flexibility.
The unit’s optimised height clearances offer greater siting options when installed with one of
our gas combi boilers.
Designed and built by Bosch, the unit is fully compatible with the latest range of Greenstar i,
Si Compact and CDi Compact combi boilers.
Product info
Part number
7 736 900 525
SAP ID
60035 NG, 60036 LPG
A highly efficient solution
Colder flue gases
leave Xtra via flue
system
1
3
2
Hot flue gases from Greenstar combi
condensing boiler
1 Cold mains water enters the
Xtra unit.
2 Cold water passes through the heat
3 Pre-heated water leaves the Xtra
exchanger and is heated by the hot
speeding up the heating of hot
waste flue gases from the boiler.
water, reducing gas consumption
and CO2 emissions.
Feature
Benefit
For the Specifier…
SAP listed FGHR unit enables the heating system
to meet SAP target emission rates for new build properties
Can be used as an energy saving measure to improve
domestic EPC (Energy Performance Certificate) ratings
More cost-effective than other solutions such as solar thermal
or heat pumps
Savings on building fabric such as insulation can be achieved
Property receives a higher energy rating and occupier
achieves lower fuel bills
For the Installer…
Compact design for flexible installation
Ease of installation
Does not require blending valve or additional mounting plate
reducing installation time and cost
Pipes positioned for easy connections
No additional training required for a qualified gas installer
Flexible fluing options
Compatible with both 60/100mm and 80/150mm flues offering
freedom of siting
For the End User…
When fitted to a Greenstar combi, it reduces the amount
of gas used to provide hot water
Reduction in gas bills and carbon emissions
Installation considerations
4
• The Greenstar Xtra unit is only suitable for use with
5
Condensfit II 60/100mm or 80/150mm flues.
• The maximum flue length permitted for the
boiler should be reduced by 3m when a
Greenstar Xtra unit is fitted.
• Compatible with the following Condensfit II flues:
Part Number
Description
7 733 600 048
High Level Horizontal Flue Kit
7 719 002 430
Standard Vertical Flue Kit
6
2
7
Greenstar Xtra
Weight
3.0kg (dry) / 3.4kg (wet)
Flue reduction
3m
Dimensions (HxWxD)
216x311x233mm
Water connections
15mm
Maximum main inlet pressure
10bar
Minimum mains inlet pressure
(working) for operation with
Compact combi appliances
0.25bar
Minimum mains inlet pressure
(working) for maximum flow
with Compact combi appliances
1
3
1 Cold mains supply
2 Non-return valve (may be
present, see notice below)
3 Mini expansion vessel
(may be required, see
notice below)
4 DW Inlet – Xtra
5 DW Outlet – Xtra
6 DHW Inlet – Boiler
7 DHW Outlet – Boiler
Where the mains water supply has a non-return, back
flow prevention valve fitted, a mini expansion vessel [3]
(part number 7 716 192 105) should be connected to
the mains water inlet pipe [1] as shown above.
2.4bar
Step by step installation instructions
1
2
3
4
5
Dissemble the
Slide the Greenstar
Attach the Greenstar
Connect the water
Fit the horizontal or
adaptor from the
Xtra into the adaptor
Xtra to the adaptor
pipes using the 90°
vertical flue adaptor
Greenstar Xtra by
and rotate to
using the included
compression joint
into the Greenstar
removing the front
correctly position it.
unit fixing screw.
elbow.
Xtra flue connection
fixing screw. Using
point. Secure the unit
the three screws
with the three fixing
provided secure
screws provided.
the adaptor to the
boiler.
* Please refer to installation manual for full instructions.
Technical Helpline
Service Enquiries
Literature
(Pre & Post Sales)
Email: service-enquiries@uk.bosch.com
Email: brochure-request@uk.bosch.com
Email: technical-advice@uk.bosch.com
or telephone 0330 123 9559
or telephone 0330 123 9119
or download instantly from our website
or telephone: 0330 123 3366
worcester-bosch.co.uk/xtra
In partnership with
Worcester, Bosch Group,
Cotswold Way, Warndon,
Part No. 8 716 117 294 B 09/16
Worcester, WR4 9SW
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