Navien NCB300 Gas Combi Boiler 28kW
Navien NCB300 Gas Combi Boiler 28kW
(Approx. 3-5 working days)
Do you have a MacBlair trade account?
The Navien NCB300 28kW is a compact, wall mounted condensing gas combi boiler designed for smaller homes requiring efficient heating and hot water. It provides central heating and instantaneous domestic hot water without a separate cylinder.
This model delivers a domestic hot water output of 28kW with a flow rate of up to 11.5 litres per minute at 35°C rise. It features stainless steel heat exchangers for durability, a 6:1 turndown ratio for efficient modulation, and an ErP A-rated efficiency of up to 94%. The boiler is hydrogen-ready for a 20% blend.
Compact dimensions (680 × 395 × 283mm) allow easy cupboard installation. It meets NOx Class 6 standards and supports smart controls via OpenTherm and Navien’s own systems.
- 28kW domestic hot water output for small homes
- Flow rate up to 11.5 l/min at 35°C rise
- Stainless steel heat exchangers for long-term efficiency
- Compact size: 680 × 395 × 283mm
- Compatible with natural gas and LPG
| Banner | 
Navien NCB300 28kW Gas Condensing Combi BoilerThe compact, highly efficient, and reliable heating solution for modern homes. Engineered with premium stainless steel components for maximum longevity. 
Compact Cupboard FitAt just 280mm deep, it seamlessly fits into a standard kitchen cupboard. 
Stainless Steel ExchangersPrevents corrosion, improves water quality, and guarantees a longer lifespan. 
ErP A-Rated EfficiencyHelps reduce your energy bills and minimizes your carbon footprint. 
20% Hydrogen ReadyFuture-proofed technology, ready to accept a 20% hydrogen blend. 
Discreet, Space-Saving DesignSpace is at a premium in modern homes. The Navien NCB300 has been meticulously designed with a depth of just 280mm, meaning it slides perfectly into standard kitchen cupboards. You no longer have to compromise on performance to save space. Despite its compact footprint, the NCB300 28kW delivers exceptional hot water performance, easily meeting the demands of small to medium-sized properties. 
Uncompromising DurabilityAt the heart of the NCB300 is Navien's state-of-the-art stainless steel heat exchanger. Unlike cheaper aluminium alternatives, stainless steel is highly resistant to corrosion and erosion. This ensures that your boiler maintains peak efficiency throughout its lifespan, offering you peace of mind, reliable hot water, and a significantly reduced risk of breakdown. 
Take Control of Your ComfortThe NCB300 features a sleek, easy-to-use digital display for simple adjustments on the unit itself. For ultimate convenience, it is fully compatible with advanced smart room thermostats. Optimize your heating schedules, monitor your energy usage, and control your home's temperature from your smartphone, ensuring your home is always warm when you arrive. Technical Specifications
|
||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brand | Navien | ||||||||||||||||
| Width | 395 mm | ||||||||||||||||
| Depth | 285 mm | ||||||||||||||||
| Flow Rate | 16 l/h | ||||||||||||||||
| Flue Included | No | ||||||||||||||||
| Fuel Type | Gas | ||||||||||||||||
| Heating Energy Rating | A | ||||||||||||||||
| Heating Type | Condensing | ||||||||||||||||
| Height | 680 mm | ||||||||||||||||
| Max Heat Input | 24.7 kW | ||||||||||||||||
| Heating Output | 24 kW | ||||||||||||||||
| Min Heat Input | 4.3 | ||||||||||||||||
| Min Heat Output | 4.2 | ||||||||||||||||
| Model Name / No | NCB300-28C | ||||||||||||||||
| Weight | 29 kg | ||||||||||||||||
| Suitable For | Smaller Homes with 1 Shower | ||||||||||||||||
| Usage | Internal Use | ||||||||||||||||
| Length Of Warranty | 5 Years | ||||||||||||||||
| Water Energy Rating | A | ||||||||||||||||
| Domestic Hot Water Output | 28 | ||||||||||||||||
| Mount Type | Wall Mounted | ||||||||||||||||
| Hydrogen Ready | No |
- Delivery cost will be calculated at checkout once delivery address has been confirmed
- Delivery lead times are an estimate only
- Delivery drivers will always prioritise safety over convenience when offloading materials
- Bagged products such as cement and plaster cannot be returned once opened
- Jumbo bags cannot be returned once delivered
- All other goods may be returned within 3 months with a proof of purchase provided
- Chargeable pallets may be returned for a full refund
- All online pricing is specific to Northern Ireland only. Pricing for our Isle of Man branch may vary.
The Navien NCB300 28kW is a compact, wall mounted condensing gas combi boiler designed for smaller homes requiring efficient heating and hot water. It provides central heating and instantaneous domestic hot water without a separate cylinder.
This model delivers a domestic hot water output of 28kW with a flow rate of up to 11.5 litres per minute at 35°C rise. It features stainless steel heat exchangers for durability, a 6:1 turndown ratio for efficient modulation, and an ErP A-rated efficiency of up to 94%. The boiler is hydrogen-ready for a 20% blend.
Compact dimensions (680 × 395 × 283mm) allow easy cupboard installation. It meets NOx Class 6 standards and supports smart controls via OpenTherm and Navien’s own systems.
- 28kW domestic hot water output for small homes
- Flow rate up to 11.5 l/min at 35°C rise
- Stainless steel heat exchangers for long-term efficiency
- Compact size: 680 × 395 × 283mm
- Compatible with natural gas and LPG
| Banner |
Navien NCB300 28kW Gas Condensing Combi BoilerThe compact, highly efficient, and reliable heating solution for modern homes. Engineered with premium stainless steel components for maximum longevity.
Compact Cupboard FitAt just 280mm deep, it seamlessly fits into a standard kitchen cupboard.
Stainless Steel ExchangersPrevents corrosion, improves water quality, and guarantees a longer lifespan.
ErP A-Rated EfficiencyHelps reduce your energy bills and minimizes your carbon footprint.
20% Hydrogen ReadyFuture-proofed technology, ready to accept a 20% hydrogen blend.
Discreet, Space-Saving DesignSpace is at a premium in modern homes. The Navien NCB300 has been meticulously designed with a depth of just 280mm, meaning it slides perfectly into standard kitchen cupboards. You no longer have to compromise on performance to save space. Despite its compact footprint, the NCB300 28kW delivers exceptional hot water performance, easily meeting the demands of small to medium-sized properties.
Uncompromising DurabilityAt the heart of the NCB300 is Navien's state-of-the-art stainless steel heat exchanger. Unlike cheaper aluminium alternatives, stainless steel is highly resistant to corrosion and erosion. This ensures that your boiler maintains peak efficiency throughout its lifespan, offering you peace of mind, reliable hot water, and a significantly reduced risk of breakdown.
Take Control of Your ComfortThe NCB300 features a sleek, easy-to-use digital display for simple adjustments on the unit itself. For ultimate convenience, it is fully compatible with advanced smart room thermostats. Optimize your heating schedules, monitor your energy usage, and control your home's temperature from your smartphone, ensuring your home is always warm when you arrive. Technical Specifications
|
||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Brand | Navien | ||||||||||||||||
| Width | 395 mm | ||||||||||||||||
| Depth | 285 mm | ||||||||||||||||
| Flow Rate | 16 l/h | ||||||||||||||||
| Flue Included | No | ||||||||||||||||
| Fuel Type | Gas | ||||||||||||||||
| Heating Energy Rating | A | ||||||||||||||||
| Heating Type | Condensing | ||||||||||||||||
| Height | 680 mm | ||||||||||||||||
| Max Heat Input | 24.7 kW | ||||||||||||||||
| Heating Output | 24 kW | ||||||||||||||||
| Min Heat Input | 4.3 | ||||||||||||||||
| Min Heat Output | 4.2 | ||||||||||||||||
| Model Name / No | NCB300-28C | ||||||||||||||||
| Weight | 29 kg | ||||||||||||||||
| Suitable For | Smaller Homes with 1 Shower | ||||||||||||||||
| Usage | Internal Use | ||||||||||||||||
| Length Of Warranty | 5 Years | ||||||||||||||||
| Water Energy Rating | A | ||||||||||||||||
| Domestic Hot Water Output | 28 | ||||||||||||||||
| Mount Type | Wall Mounted | ||||||||||||||||
| Hydrogen Ready | No |
- Delivery cost will be calculated at checkout once delivery address has been confirmed
- Delivery lead times are an estimate only
- Delivery drivers will always prioritise safety over convenience when offloading materials
- Bagged products such as cement and plaster cannot be returned once opened
- Jumbo bags cannot be returned once delivered
- All other goods may be returned within 3 months with a proof of purchase provided
- Chargeable pallets may be returned for a full refund
- All online pricing is specific to Northern Ireland only. Pricing for our Isle of Man branch may vary.
Navien NCB300 28kW Gas Condensing Combi Boiler
The compact, highly efficient, and reliable heating solution for modern homes. Engineered with premium stainless steel components for maximum longevity.
Compact Cupboard Fit
At just 280mm deep, it seamlessly fits into a standard kitchen cupboard.
Stainless Steel Exchangers
Prevents corrosion, improves water quality, and guarantees a longer lifespan.
ErP A-Rated Efficiency
Helps reduce your energy bills and minimizes your carbon footprint.
20% Hydrogen Ready
Future-proofed technology, ready to accept a 20% hydrogen blend.
Discreet, Space-Saving Design
Space is at a premium in modern homes. The Navien NCB300 has been meticulously designed with a depth of just 280mm, meaning it slides perfectly into standard kitchen cupboards.
You no longer have to compromise on performance to save space. Despite its compact footprint, the NCB300 28kW delivers exceptional hot water performance, easily meeting the demands of small to medium-sized properties.
Uncompromising Durability
At the heart of the NCB300 is Navien's state-of-the-art stainless steel heat exchanger. Unlike cheaper aluminium alternatives, stainless steel is highly resistant to corrosion and erosion.
This ensures that your boiler maintains peak efficiency throughout its lifespan, offering you peace of mind, reliable hot water, and a significantly reduced risk of breakdown.
Take Control of Your Comfort
The NCB300 features a sleek, easy-to-use digital display for simple adjustments on the unit itself. For ultimate convenience, it is fully compatible with advanced smart room thermostats.
Optimize your heating schedules, monitor your energy usage, and control your home's temperature from your smartphone, ensuring your home is always warm when you arrive.
Technical Specifications
| Model | NCB300 28kW Gas Combi |
|---|---|
| DHW Output (Max) | 28.0 kW |
| Central Heating Output (Max) | 25.8 kW |
| Dimensions (H x W x D) | 600mm x 395mm x 280mm |
| Weight | 26 kg |
| DHW Flow Rate (at 35°C rise) | 11.5 Litres/minute |
| ErP Rating (Heating & Water) | A |
| Heat Exchanger Material | Stainless Steel |
-
Navien NCB300/500 Stand Off KitAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£71.49 Ex VAT£85.79 Inc VAT£71.49 Ex VAT£85.79Inc VAT -
Navien NCB500 Gas Combi Boiler 30kWAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£815.00 Ex VAT£978.00 Inc VAT£815.00 Ex VAT£978.00Inc VAT -
Navien Weather Slate for Pitched RoofAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£63.01 Ex VAT£75.61 Inc VAT£63.01 Ex VAT£75.61Inc VAT -
Navien Weather Slate for Flat RoofAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£39.40 Ex VAT£47.28 Inc VAT£39.40 Ex VAT£47.28Inc VAT -
Navien LCB Plinth for External Combi BoilersAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£96.46 Ex VAT£115.75 Inc VAT£96.46 Ex VAT£115.75Inc VAT -
Navien Wall Bracket for Flue SystemsAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£33.63 Ex VAT£40.36 Inc VAT£33.63 Ex VAT£40.36Inc VAT -
Navien Flue Extension 0.5m x 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£54.18 Ex VAT£65.02 Inc VAT£54.18 Ex VAT£65.02Inc VAT -
Navien Flue Extension 1m x 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£54.59 Ex VAT£65.51 Inc VAT£54.59 Ex VAT£65.51Inc VAT -
Navien 90° Flue Bend 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£50.89 Ex VAT£61.07 Inc VAT£50.89 Ex VAT£61.07Inc VAT -
Navien 45° Flue Bend 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£55.16 Ex VAT£66.19 Inc VAT£55.16 Ex VAT£66.19Inc VAT -
Navien Roof Terminal Adaptor 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£104.25 Ex VAT£125.10 Inc VAT£104.25 Ex VAT£125.10Inc VAT -
Navien Plume Management Kit 60mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£133.96 Ex VAT£160.75 Inc VAT£133.96 Ex VAT£160.75Inc VAT -
Navien Horizontal Flue Kit 1m x 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£88.98 Ex VAT£106.78 Inc VAT£88.98 Ex VAT£106.78Inc VAT -
Navien Vertical Flue Adaptor 60/100mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£54.18 Ex VAT£65.02 Inc VAT£54.18 Ex VAT£65.02Inc VAT -
Navien Plume Extension Black with Wall Bracket 1m x 60mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£39.40 Ex VAT£47.28 Inc VAT£39.40 Ex VAT£47.28Inc VAT -
Navien Plume Management Wall Bracket 60mm BlackAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£25.22 Ex VAT£30.26 Inc VAT£25.22 Ex VAT£30.26Inc VAT -
Navien Plume Diverter 60mmAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£25.23 Ex VAT£30.28 Inc VAT£25.23 Ex VAT£30.28Inc VAT -
Navien Smart Plus Wiring Centre for Boiler ControlsAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£144.99 Ex VAT£173.99 Inc VAT£144.99 Ex VAT£173.99Inc VAT -
Navien NCB700 42kW Gas Combi BoilerAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£1,299.99 Ex VAT£1,559.99 Inc VAT£1,299.99 Ex VAT£1,559.99Inc VAT -
Navien NCB500 37kW Gas Combi BoilerAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£920.00 Ex VAT£1,104.00 Inc VAT£920.00 Ex VAT£1,104.00Inc VAT -
Navien NCB300 Gas Combi Boiler 37kWAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£650.00 Ex VAT£780.00 Inc VAT£650.00 Ex VAT£780.00Inc VAT -
Navien NCB300 Gas Combi Boiler 41kWAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£715.00 Ex VAT£858.00 Inc VAT£715.00 Ex VAT£858.00Inc VAT -
Navien NCB700 54kW Gas Combi BoilerAvailable for deliveryAvailable for click & collect from
Available for click & collect
from Change BranchAvailable for delivery Extended lead times applyAvailable to order for collection from Change Branch Extended lead times applyOut of stock for delivery
Out of stock for click & collect Change Branch
£1,540.00 Ex VAT£1,848.00 Inc VAT£1,540.00 Ex VAT£1,848.00Inc VAT