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oncore, specialist heative
Oftec 12690 Gas Safe Register 526952

Telephone Number 01539 751 128 

Oncore House, Longlands Road, Bowness on Windermere, LA23 3AS

Alpha approved installer


High efficiency boilers and low carbon solutions
Alpha's range of domestic high efficiency gas boilers includes combis, system boilers and regular boilers, plus a wall-hung storage combination boiler. In addition, our light commercial range of high output system boilers is perfect for larger output requirements and suitable for single unit or cascade installations.

Products like GasSaver, FlowSmart and SolarSmart use advanced technology and are designed to operate with our gas boilers, to enhance the efficiency further, helping you to use less gas for your heating and hot water, in turn reducing energy bills and carbon emissions.

As you would expect, all of our boilers and low carbon products feature only the best quality components and, to give you complete confidence, come with generous all-inclusive guarantees. Our flagship InTec C combi boilers come with an all-inclusive 5 year guarantee as standard, or 7 years when fitted with the optional PremierPack Plus wall-mounting jig.

Take control

Create the perfect climate with Alpha Climatic and Comfort controls that allow you to tailor your system according to your individual lifestyle more

Worcester greenstar 25si, horizontal flue and digital time clock fitted from £1450

The Greenstar Si combi boilers are our mid-range appliances.

They’re suitable for apartments and small to medium sized 1 bathroom properties.

You can control both the hot water and central heating temperatures on a Greenstar Si boiler. There is also a range of optional controls available, offering you further comfort and flexibility.

For further peace of mind, every boiler in Worcester’s Greenstar gas and LPG condensing boiler range has been awarded a Which? Best Buy accreditation.

5 year boiler guarantee.

10 year guarantee on primary heat exchanger.

Central heating output: 24kW

Domestic hot water flow rate: 10.2 litres per minute at 35 degree temperature rise (provided adequate mains water pressure is available)


The Greenstar 25Si is 90.1% efficient and is in the highest possible official efficiency category, SEDBUK band ‘A‘This boiler is registered with the Energy Saving Trust

For more information please visit the manufacturers website

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