Oil Boilers



Oil Boilers

As an OFTEC registered and approved installer, we’ve undertaken vigorous testing and ongoing assessments to ensure the highest standard of care, knowledge and safety when installing, servicing and maintaining oil boilers.

We’re a Worcester Bosch accredited installer of oil boilers, meaning that we get to work with their leading and award winning range of Greenstar boilers. But we also have extensive knowledge and experience of many other oil boilers that are currently on the market.

As well as our installation service, we also provide a comprehensive aftercare option that accounts for maintenance as well as annual servicing of your oil boiler. It means optimum efficiency for your oil boiler system for many years to come.


Assured Heating

External Oil Boiler

The Worcester Bosch Greenstar Heatslave External condensing oil boilers are true external boilers designed to be situated outside your property.

This boiler is perfect for when it’s not feasible to have the boiler in your kitchen or cupboard, or if you would simply prefer to have the boiler outside. It has an insulated weatherproof cabinet to help withstand the elements.

The Greenstar Heatslave External 25/32 is 90.2% efficient and is in the highest possible official efficiency category: SEDBUK band 'A'.

No Ban On Oil Boilers in 2035.

Parliament has just passed the new HVO replacement fuel to replace kerosene.


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Oil Boiler Features

Best official boiler efficiency rating (SEDBUK band A)

7 year boiler guarantee (terms and conditions apply)

7 year guarantee on primary heat exchanger

10 year guarantee on secondary heat exchanger

Ideal solution when looking to save internal property space

Can be used with your existing heating controls

Pre-heated thermal store – instantly heated hot water

High-quality insulated weatherproof cabinet

Resistant to water, dust and other external elements

Built-in frost protection

Superior domestic hot water flow rate


Contact Assured Heating

We provide a complete supply and installation service at Assured Heating for oil boilers. Wherever you’re based in the region, our OFTEC-accredited team in Motherwell have you covered. Get in touch to discuss your requirements.

 01698 230635

 07771 657674

 Email us

 Online Contact Form

Assured Heating



1st Class Engineers

Would like to thank Clark and his apprentice for a 1st Class Service. Removed and installed an entire new Worcester Bosch 25/32 heatslave combi. Start to finish extremely professional and knowledgable at every stage. I now have a heating system with hot water and a house nice and cosy for the first time since Boxing Day.


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