Efficient, reliable oil heating
- Oil
- Regular
10-Year Warranty – Enjoy complete peace of mind with Navien’s trusted reliability.
HVO Compatible – Future-ready for renewable, low-carbon heating fuels.
Blue Flame Technology – Ultra-efficient performance with ultra-low NOx emissions.
Lightweight, Compact Design – Easy to install in tight spaces with flexible flueing up to 21m.
Stainless Steel Heat Exchangers – Built for long-lasting durability and consistent efficiency.
Smart Plus Control Ready – Manage up to three heating zones with intuitive, text-driven controls.
Top-Tier Efficiency – A-rated energy performance helps reduce fuel consumption and running costs.
The Navien LCB700 Blue Flame Regular Boiler is engineered for maximum performance and long-term efficiency. Designed for traditional heating systems, it combines compact dimensions with advanced combustion technology — delivering reliable heat output and ultra-low emissions for both modern and rural homes.
Performance & Output
Available Outputs: 21kW, 28kW, and 36kW models to suit a range of property sizes.
Heat Output (80/60°C): From 16–36kW for powerful, consistent home heating.
Heat Output (50/30°C): Up to 39.0kW, ensuring fast, efficient warmth even in larger systems.
ErP Efficiency Rating: A (93%), improving to A+ (98%) when paired with Navien Smart Plus controls.
Flue & Venting Options
Flue Type: Coaxial Plastic Ø60/100
Maximum Horizontal Length: Up to 20m
Maximum Vertical Length: Up to 21m
This gives installers outstanding flexibility for a variety of property layouts and installation types.
Design & Build
Dimensions (Regular/System): Compact design at 470 x 600 x 860mm, ideal for utility rooms and plant spaces.
Weight:
Regular Models: 58–68kg
System Models: 66–76kg
Construction: Built with stainless steel heat exchangers for exceptional strength, durability, and corrosion resistance.
Environmental Performance
NOx Emissions: As low as 57.2mg/kWh, meeting Class 6 standards for cleaner, greener operation.
Blue Flame Technology: Ensures optimal combustion efficiency with ultra-low emissions.
HVO Ready: Compatible with renewable biofuel alternatives for future-proof heating.
A+ Energy Efficiency – One of the UK’s most efficient oil boilers for lower energy bills.
Future-Ready Heating – HVO compatible and designed to support renewable fuels.
Blue Flame Technology – Delivers cleaner combustion and ultra-low NOx emissions.
Smart Plus Compatible – Boost efficiency up to A+ (98%) with advanced smart controls.
Lightweight & Compact – Simple, flexible installation with flue runs up to 21m.
Durable Stainless Steel Heat Exchangers – Long-lasting performance and reliability.
10-Year Warranty – Peace of mind backed by Navien’s engineering excellence.
3-Zone Heating Ready – Perfect control and comfort across multiple areas of your home.
Intuitive Display – Easy-to-use interface showing temperature and fuel consumption.
Modern Design – Sleek, clean look to complement any home or plant room.
What’s Included with The Boiler Team Installation?
Installed by a local Oftec engineer
Oil Filters / Fire Valve Upgrade Pack Included
Old boiler & tanks removed (if applicable)
All waste cleared, including old boiler
Flue installation for optimal performance
Magnetic filter to protect your system
System cleanse + protective treatments included
Pipework upgrades where required
Premium copper & fittings supplied
Electrical setup, including wireless thermostat (if applicable)
Delivery & setup arranged for you
Warranty registration & certification handled
Manufacturer parts & labour warranty included
10-Year workmanship guarantee from The Boiler Team
Frequently Asked Questions About Navien Boilers
Find clear, expert answers about Navien Oil Regular boilers — discover their features, efficiency benefits, and how to choose the best gas boiler for your home.
The Navien LCB700 Blue Flame Regular Boiler is a high-efficiency oil boiler designed for traditional heating systems. It features advanced Blue Flame technology for ultra-low NOx emissions and exceptional fuel efficiency.
Yes, the LCB700 is fully compatible with HVO (Hydrotreated Vegetable Oil), making it future-ready for renewable and sustainable heating solution
The LCB700 achieves an ErP A rating (93%), and when combined with Navien’s Smart Plus controls, it can reach an A+ rating (98%) for even greater energy savings
The LCB700 Regular Boiler is available in 21kW, 28kW, and 36kW models, making it suitable for small, medium, and large homes.
Yes. Its compact, lightweight design and flexible flueing options up to 21 metres make installation simple, even in smaller plant rooms or utility areas.
Blue Flame technology ensures cleaner, more efficient combustion, resulting in higher performance, lower emissions, and reduced fuel consumption compared to standard yellow-flame oil boilers.
Absolutely. It features a text-driven digital display for intuitive operation and can integrate with Smart Plus controls for zoning, energy tracking, and remote management.
It’s ideal for homes with a separate hot water cylinder and radiator-based central heating systems, offering powerful, consistent heating performanc
Yes, every Navien LCB700 Regular Boiler comes with a 10-year parts and labour warranty, giving you long-term peace of mind.
The LCB700 delivers ultra-low NOx emissions, HVO compatibility, and A+ energy efficiency, making it one of the most sustainable oil boilers on the UK market.
Boiler Finance Available
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