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Key features of the range
Winner of Which? Best Buy awards
in 2011, 2012 and 2013
For three consecutive years, in a survey of
Which? members, the Worcester Greenstar
gas-fired condensing boiler range has been
presented with Best Buy awards.* In the
latest survey, no other manufacturer scored
higher for reliability and customer satisfaction.
Highly effi cient, highly cost-effective
All Worcester Greenstar condensing combi boilers
have an annual A rated effi ciency (SEDBUK 2005
value) of over 90%, effi ciently producing heating
and hot water for the home. Non-condensing boilers
achieve around 78% effi ciency.
Low NOx options
Worcester’s commitment to reduce emissions from
gas-fi red condensing boilers sees all Greenstar
combi boilers achieve NOx values <40mg/kWh.
This enables the appliances to achieve 3 credits
under the Code for Sustainable Homes. The i Junior
requires a low NOx code plug which is available
as an optional accessory. All other boilers are low
NOx as standard.
Hot water mode
Whenever a hot water tap is turned on, the
incoming mains water will activate a fl ow turbine
which, via the electronic control system, ignites
the pre-mix burner. Boiler output is automatically
boosted to maximum in order to heat the incoming
cold water as it passes through the heat exchanger.
Electronic controls modulate the boiler output to
ensure an accurate hot water temperature.
Keep hot facility
All Greenstar combi models have an in-built
‘keep hot’ facility which will keep the primary water
within the heat exchanger hot – approximately
2.5 litres volume. This will ensure that hot water is
delivered almost instantly to the opened outlet.
ECO mode
With the ECO mode button activated, the ‘keep hot’
facility is de-energised and the hot water will be
heated from cold. A slight delay should be expected
before the hot water is at full temperature when in
ECO mode. By selecting ECO mode, less gas will be
used as energy is used only on demand.
Central heating mode
On a central heating demand, the boiler will initially
fi re at minimum output before modulating upwards
to meet the system’s actual requirement. Electronic
controls within the boiler continually monitor the
heating fl ow and return temperature and increase
or decrease the output on demand.
Fluing options
The Greenstar combi range has a full range of
Condensfi t II™ fl ue options in both 60/100mm
and 80/125mm diameters and include a plume
defl ector as standard. This versatile fl ue system
can be run horizontally or vertically.
The Greenstar Si Compact
has the same fascia with an
intuitive in-built display as the
Greenstar CDi Compact
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