The Navien LCB700 External Combi Oil Boiler is a high-efficiency heating solution with impressive 93-98% efficiency ratings and three power outputs (21kW, 28kW, and 36kW) to suit different home sizes. You'll get exceptional performance from its stainless steel heat exchanger and weather-resistant casing, backed by a solid 10-year warranty. While prices range from £2,810 to £3,450 installed, including labour and parts, its future-ready design and HVO fuel compatibility make it worth considering. Let's explore what makes this boiler stand out from the competition.
Key Takeaways
- The Navien LCB700 offers impressive efficiency ratings of 93-98% and comes in three power outputs: 21kW, 28kW, and 36kW.
- Prices range from £1,510 to £1,650 excluding VAT, with total installation costs between £2,810 and £3,450 including sundries.
- The boiler features weather-resistant casing, floor-standing design, and can heat up to 15 radiators with excellent hot water flow.
- A comprehensive 10-year parts and labour warranty is included, requiring annual service maintenance by qualified engineers.
- The unit achieves A+ energy rating with Smart Plus controls and includes future-ready compatibility with HVO fuel options.
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Navien LCB700 External Combi Oil Boiler Overview
The Navien LCB700 External Combi Oil Boiler stands as one of the most advanced outdoor heating solutions in today's market.
With its weather-resistant casing and floor-standing design, you won't need to sacrifice precious indoor space for installation.
You'll appreciate the impressive 93% efficiency rating and Blue Flame technology that keeps both your energy bills and emissions low.
The boiler comes in three power outputs – 21kW, 28kW, and 36kW – so you can pick the perfect size for your home.
What's really clever is its future-ready design.
It's compatible with HVO fuel and smart controls, including geofencing that'll automatically adjust your heating when you're heading home.
Plus, with a 10-year warranty and stainless steel heat exchanger, you won't need to worry about reliability or durability.
Navien LCB700 External Combi Oil Boiler Performance and Efficiency
When it comes to performance, Navien's LCB700 External Combi Oil Boiler truly shines with its impressive 93% efficiency rating, which you can boost to 98% by pairing it with a Navien Smart Plus thermostat. The boiler's Blue Flame technology helps achieve these remarkable efficiency levels while keeping your energy bills in check.
| Feature | Specification |
|---|---|
| Hot Water Flow Rate | 18 l/min (28kW) |
| Max Heating Output | 30.3 kW (28kW) |
| Radiator Capacity | Up to 15 radiators |
You'll get plenty of heating power and hot water for your home's needs. The 28kW model delivers an impressive 18 litres per minute of hot water, perfect for running multiple taps simultaneously. If you've got a larger home, you might want to evaluate the 39kW version, which can handle up to 20 radiators and provides even more hot water capacity.
Navien LCB700 External Combi Oil Boiler Pros and Cons
Building on its impressive performance specs, let's examine what makes the Navien LCB700 External Combi Oil Boiler a smart choice – and where it might fall short.
You'll appreciate the boiler's A+ energy rating when paired with Smart Plus controls, and its Blue Flame technology delivers exceptional efficiency with low emissions. The stainless steel heat exchanger and 10-year warranty offer peace of mind for your investment.
However, there are some trade-offs to evaluate. You'll need to budget for a higher upfront cost compared to non-condensing alternatives. The limited output options mightn't suit every home's needs, and you'll need space for that oil storage tank (not exactly a garden ornament!).
Installation is straightforward thanks to its lightweight design and combined PRV/condensate drain.
Though you'll need regular maintenance to keep it running at peak efficiency.
For more detailed information about specifications and performance, check out our comprehensive Navien boilers guide in our resource section.
How Does The Navien LCB700 External Combi Oil Boiler Compare To Similar Models From Other Manufacturers?
Compared to its competitors, Navien's LCB700 External Combi Oil Boiler stands out with several distinct advantages.
When you're comparing it to models like the Firebird Enviroblue or Grant VortexBlue, you'll notice some key differences.
- Warranty coverage – The LCB700's 10-year warranty trumps the standard 2-year warranties offered by competitors.
- Hot water performance – With a flow rate of 20 l/min, it outperforms many rival models.
- Flue flexibility – You can extend the flue up to 21m, giving you more installation options.
- Energy efficiency – While competitors typically achieve 90-94% efficiency, the LCB700 can reach 98% with smart controls.
You're also getting more modern features with the LCB700, including its user-friendly text-driven display and advanced Blue Flame technology.
That's something you won't find in every competitor's model.
How Much Does A Navien LCB700 External Combi Oil Boiler Cost?
If you're considering the Navien LCB700 External Combi Oil Boiler, you'll need to budget between £2,810 and £3,450 for the complete installation. This total includes the boiler unit, installation costs, and necessary sundries like filters and flues.
The boiler itself comes in three power outputs: 21kW (£1,510), 28kW (£1,550), and 36kW (£1,650), with prices excluding VAT.
Installation typically runs between £1,000 and £1,500, plus about £300 for sundries.
Your final costs might vary depending on several factors. These include your location, the complexity of the installation, and the time of year you're having it installed.
The good news? The boiler's high efficiency rating of up to 98% means you'll likely recoup some costs through lower energy bills.
Navien LCB700 External Combi Oil Boiler Warranty and Service Support
While choosing a boiler within your budget matters, you'll want to know what kind of protection comes with your investment. The Navien LCB700 comes with a thorough 10-year parts and labour warranty that kicks in from your installation date.
To keep your warranty valid, you'll need to follow these key requirements:
- Register your warranty by emailing photos of your documentation to [email protected]
- Schedule annual service with a qualified engineer
- Confirm installation is done by a licensed professional
- Maintain proper operation and regular maintenance
You'll have access to excellent support through Navien's two technical centres, available 7 days a week with extended hours.
If you need help, their support hotline (800-519-8794) is ready to assist with any issues you might encounter.
Final Verdict
Based on our thorough analysis, the Navien LCB700 external combi oil boiler stands out as a robust and reliable heating solution for UK homeowners.
With its impressive 93% efficiency rating and advanced Blue Flame technology, you'll get excellent performance while keeping those energy bills in check.
The weatherproof design and flexible installation options make it a practical choice for various property types.
You'll appreciate the space-saving compact design and smart features like frost protection and consumption monitoring.
While the initial installation cost might make your wallet wince, the long-term benefits of high efficiency and durability make it a worthwhile investment.
If you're looking for a future-proof oil boiler that can handle the heating and hot water needs of a medium-sized home, the LCB700 won't disappoint.
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