Greenstar Heatslave II External
Release Date 2018Ideal for homes with
1-2 Bathrooms
Ideal for homes with
1-4 Bedrooms
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Greenstar Heatslave II External Overview
The Greenstar Heatslave II is the UK’s most popular external oil combi boiler thanks to its numerous features.
The Greenstar Heatslave II has a modern design and is available in a number of sizes (12/18, 18/25 and 25/32) making it a good choice for small, medium and large sized homes – with one or two bathrooms. It’s contained in a green-coated cabinet allowing the boiler to blend into garden settings whilst also providing protection against the elements.
Other features include: solar compatibility, precise heating and hot water controls, inbuilt frost protection and energy-saving modes.
Greenstar Heatslave II External Specification
Please select a boiler model below to view its specifications.
| Fuel | Oil |
| Model | 12/18 |
| MPN | |
| Condensing | Condensing |
| Efficiency Rating | 90% |
| ERP | A HEAT B WATER |
| LPG Version | No |
| Solar Compatible | Yes |
| Standard Warranty | Up to 7 Years |
| Central Heating Max Output | 18kW |
| Flow Rate | 15 l/min |
| Mounting | Floor |
| Dimensions | 950 x 640 x 770 |
| Typical Price (inc VAT) | £2,500 |
| Typical Installation Price (inc VAT) | £1000 - £1500 |
| Sundries (Filter, Flue, etc) | £300 |
| Total Cost | £3800 - £4300 |
| Fuel | Oil |
| Model | 18/25 |
| MPN | |
| Condensing | Condensing |
| Efficiency Rating | 90% |
| ERP | A HEAT B WATER |
| LPG Version | No |
| Solar Compatible | Yes |
| Standard Warranty | Up to 7 Years |
| Central Heating Max Output | 25kW |
| Flow Rate | 18 l/min |
| Mounting | Floor |
| Dimensions | 950 x 640 x 770 |
| Typical Price (inc VAT) | £2,600 |
| Typical Installation Price (inc VAT) | £1000 - £1500 |
| Sundries (Filter, Flue, etc) | £300 |
| Total Cost | £3900 - £4400 |
| Fuel | Oil |
| Model | 25/32 |
| MPN | |
| Condensing | Condensing |
| Efficiency Rating | 90% |
| ERP | A HEAT B WATER |
| LPG Version | No |
| Solar Compatible | Yes |
| Standard Warranty | Up to 7 Years |
| Central Heating Max Output | 32kW |
| Flow Rate | 22 l/min |
| Mounting | Floor |
| Dimensions | 950 x 640 x 770 |
| Typical Price (inc VAT) | £2,800 |
| Typical Installation Price (inc VAT) | £1000 - £1500 |
| Sundries (Filter, Flue, etc) | £300 |
| Total Cost | £4100 - £4600 |
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How we’re operating during the Covid-19 pandemic.
As a preference you can now request video quotes from our network of heating engineers.
We’re here to connect you with local heating engineers through the Covid-19 pandemic.
As the nation practices social distancing, our boilers are more important than ever, and we’re following the latest government advice to ensure you don’t go without heating or hot water.
Can I still get boiler quotes?
Yes – you can still get quotes from local heating engineers.
Remote quotes are possible in most cases but this will depend on the work involved. Your installer will be able to discuss quote options with you over the phone.
Are heating engineers still allowed to work?
Yes – heating engineers are key workers so can continue working in people’s homes as long as they are in good health and don’t have any Coronavirus symptoms.
Our engineers can provide you with a quote over the phone or via a video call, and will discuss these options with you so you can find a solution you are comfortable with.
Is it safe for a tradesperson to work in my home?
Yes – by maintaining the social distancing guidelines, a tradesperson will be able to safely carry out work in your home.
We’re closely following advice from the Government and Public Health England and will make appropriate changes where necessary.
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The Combi Boiler Prices Team.