Navien might be a relatively new name to the UK market but the South Korean company is huge in other parts of the world. In fact, it is a global leader in condensing technology and the manufacturer of the best selling boiler in the US.
Navien’s range of products includes gas combi and system boilers, as well as oil-fired regular and system boilers. All of its boilers are ErP A rated for efficiency and come with a minimum warranty of 7 years.
Navien combi boilers
With a combi boiler, everything you need to produce hot water and central heating is contained within the unit itself. This means there is no need for a water storage tank or a cylinder to be installed at the same time. Combi boilers are highly efficient and are able to generate hot water as soon as you turn on the tap or shower.
The Navien NCB combi boilers are available in a range of outputs from 21.4kW to 33.2kW. They are fitted with stainless steel and brass components for better reliability and are designed to be connected to either gas or LPG straight out of the box.
Boiler model
kW Output
Efficiency
Warranty
Price
Navien NCB 24kW Combi Gas Boiler
21.4kW
92%
7 years
£N/A
Navien NCB 28kW Combi Gas Boiler
25.6kW
93%
7 years
£N/A
Navien NCB 34kW Combi Gas Boiler
31.1kW
93%
7 years
£N/A
Navien NCB 40kW Combi Gas Boiler
33.2kW
93%
7 years
£N/A
Navien system boilers
System boilers are great for homes that have a high demand for hot water or have more than one bathroom. Unlike a combi boiler, a system boiler stores hot water in a cylinder meaning it can deliver hot water to multiple outlets at the same time without losing pressure.
The Navien NCB system boilers are available in four outputs: 20kW, 23kW, 28kW and 33kW. They are fitted with a primary and secondary stainless steel heat exchanger, OpenTherm ready technology and have a self-diagnosis and error feedback feature.
Boiler model
kW Output
Efficiency
Warranty
Price
Navien NCB 20kW System Gas Boiler
20kW
92%
7 years
£N/A
Navien NCB 23kW System Gas Boiler
23kW
93%
7 years
£N/A
Navien NCB 28kW System Gas Boiler
28kW
93%
7 years
£N/A
Navien NCB 33kW System Gas Boiler
33kW
93%
7 years
£N/A
Navien oil-fired boilers
An oil boiler is a great choice for any homeowner who has a property that isn’t connected to the gas network. Not only are oil boilers very efficient, but oil is also a more efficient fuel than gas.
Navien’s range of LCB boilers are available as combi, regular or system models and come in a range of outputs from 21kW to 39kW. These boilers are also available as internal or external models, giving you greater flexibility over where you choose to install your boiler.
Navien’s revolutionary blue flame technology guarantees superior efficiency and ultra-low NOx emissions. The boiler has an efficiency rating of 93% and comes with a standard warranty of 10 years.
Navien oil-fired combi boilers
| Boiler model | kW Output | Efficiency | Warranty | Price |
| Navien LCB700 21kW Internal Combi Oil Boiler | 23kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW Internal Combi Oil Boiler | 30.3kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW Internal Combi Oil Boiler | 39kW | 93% | 10 years | £N/A |
| Navien LCB700 21kW External Combi Oil Boiler | 23kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW External Combi Oil Boiler | 30.3kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW External Combi Oil Boiler | 39kW | 93% | 10 years | £N/A |
Navien oil-fired regular boilers
| Boiler model | kW Output | Efficiency | Warranty | Price |
| Navien LCB700 21kW Internal Regular Oil Boiler | 21kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW Internal Regular Oil Boiler | 28kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW Internal Regular Oil Boiler | 36kW | 93% | 10 years | £N/A |
| Navien LCB700 21kW External Regular Oil Boiler | 21kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW External Regular Oil Boiler | 28kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW External Regular Oil Boiler | 36kW | 93% | 10 years | £N/A |
Navien oil-fired system boilers
| Boiler model | kW Output | Efficiency | Warranty | Price |
| Navien LCB700 21kW Internal System Oil Boiler | 21kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW Internal System Oil Boiler | 28kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW Internal System Oil Boiler | 36kW | 93% | 10 years | £N/A |
| Navien LCB700 21kW External System Oil Boiler | 21kW | 93% | 10 years | £N/A |
| Navien LCB700 28kW External System Oil Boiler | 28kW | 93% | 10 years | £N/A |
| Navien LCB700 36kW External System Oil Boiler | 36kW | 93% | 10 years | £N/A |