Worcester Bosch Greenstar Si Boilers are part of Worcester’s mid-range appliances. It has two heating outputs, and is ideal for apartments and smaller properties. Average prices start from around £725 excluding VAT and installation costs.
This small yet powerful combi boiler is SEDBUK A rated with 90.1% Natural Gas and 91.9% LPG fuel efficiency. Its compact and lightweight design comes with compressed hydraulics and multi-directional fluing for reliability and simple installation. Plus hot water and central heating temperatures can be controlled effortlessly with Worcester’s keep- hot facility, which means instant hot water is always on tap.
Worcester Bosch Greenstar Si boilers are also compatible with a wide range of Worcester controls, including simple-to-operate mechanical timers, sophisticated digital programmers, room thermostats and new generation intelligent controls. The use of these effective controls will improve the overall performance of a heating system by significantly reducing fuel consumption and energy bills.
Worcester Bosch Greenstar Si Boilers Overview
|Model||Type||Dimensions||Maximum Flow Rate||Output||Efficiency Rating||Typical Price|
|Greenstar 25Si||Combi||H – 710 mm|
W – 400 mm
D – 330 mm
|10.2 l/min||25 kW||A 90% and above||£851.9|
|Greenstar 30Si||Combi||H – 710 mm|
W – 400 mm
D – 330 mm
|12.3 l/min||30 kW||A 90% and above||£952.64|
|Key Features & Benefits|
|SEDBUK Band A||High energy efficiency|
|NOx Class 5- Low NOx and CO2 emissions||Environmentally friendly|
|With DHW control and fault finding diagnostics||User comfort Energy efficiency Boiler reliability Economy|
|Compatible with DT20 twin channel digital programmer, DT20RF digital RF thermostat, DT10RF digistat & optimiser.||User comfort Energy efficiency Boiler reliability Economy|
|Compatible with simple mechanical controls MT10 & MT10RF||Boiler reliability|
|Compatible with Bosch Intelligent controls like FR10 intelligent room thermostat, FR110 programmable room thermostat and FW100 weather compensation controller.||Boiler reliability|
|Keep hot facility for instantly available hot water||Convenience|
|Multi-directional fluing||Siting flexibility|
|Compact dimensions||Siting flexibility|
|Metal wall mounting frame hides pipework from view||Siting flexibility|
|Inbuilt frost protection||Longer boiler lifespan|
|Worcester- Bosch brand reliability||Peace of mind|
|2 or 5 year Warranty until 30th June 2013 (terms & conditions apply) and 10 year guarantee on primary heat exchanger.||Peace of mind|
What we think of the Worcester Greenstar Si
Just two models make up this range of boilers, the first rated at 25kW and the other at 30kW. The former provides hot water at a rate of just over ten litres a minute, whereas the latter has the slightly faster rate of 12.3 litres a minute. Both models can work on either natural gas, or LPG.
The main benefits of the Combi Si – which means you don’t have to be burdened with finding a home for a hot water storage tank, or a cold water cistern – is the size. It’s power ratings means that it is suitable for a flat, or a small house.
At a wee bit over 30kg and with slim proportions, this is a boiler which can be neatly fitted into a small kitchen space. It is especially good for cupboards and given its neat controls, it is a useful worker which provides good heat.
Getting a Competitive Boiler Quote
We suggest you do your research before purchasing your new Greenstar Si Combi boiler as prices can vary. Get a few quotes from local boiler installers and one from a national installer to find the best boiler price for your budget and requirements.
Making sure your engineer is Gas Safe Registered is essential to ensure the work is done thoroughly and safely.
Get quotes to supply a new Worcester boiler now
Things you need to know:
 British Gas acts as a credit broker, not the lender and offers products from a panel of lenders. Payment options are subject to change without notice. British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply.
 £100 additional discount is only available to British Gas energy and British Gas HomeCare 1-4 customers who choose to have a British Gas installation. This offer is available to homeowners and landlords with a total system output of up to 50kW who already have a British Gas energy tariff or HomeCare 1-4 at the property where the boiler would be installed. Available to 98% of UK mainland households. This offer cannot be used by tenants, British Gas multi–premise landlord customers and cannot be used in conjunction with staff/ex-staff/partner discounts. Terms and Exclusions apply. Offers are subject to change without notice.
 Saving when upgrading from a G-rated boiler to an A-rated boiler in a detached home using the average energy bill for a high usage house. Source: http://www.energysavingtrust.org.uk/home-energy-efficiency/boiler-replacement and https://www.britishgas.co.uk/energy/guides/average-bill.html
British Gas is a trading name of British Gas New Heating Limited (No. 06723244), an appointed representative of British Gas Services Limited (No. 03141243) which is authorised and regulated by the Financial Conduct Authority (Financial Services Register No. 490568). Both companies registered in England and Wales. Registered office: Millstream, Maidenhead Road, Windsor, Berkshire SL4 5GD. Availability of credit depends on status and credit checks. Terms and Exclusions apply. Saving when upgrading from a G-rated boiler. Source: http://www.energysavingtrust.org.uk/home-energy-efficiency/boiler-replacement