Navien NCB700 3S+/54K 54kW Combi Boiler Internal Hydrogen Ready with Built-In DHW Recirculation and 22.1 LPM Flow Rate
Navien NCB700 3S+/54K 54kW Combi Boiler offers 22.1 LPM DHW output, 15:1 turndown ratio, built-in recirculation, and 94% ErP efficiency—perfect for large homes requiring robust performance.
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- Estimated Delivery: For most items (over 99% of our products), orders placed before 3pm on working days will be dispatched the same day with our Fast DELIVERY 1st class service. For the rare items not immediately in stock, dispatch may take 1-3 working days after receiving your order. If your order cannot be dispatched the same day, we will notify you via email.
- For boilers: We aim to dispatch on the next working day. However, in some cases, it may take 2-3 working days to dispatch. Rest assured, we will always strive for the fastest possible turnaround.
The Navien NCB700 3S+/54K 54kW Combi Boiler sets a new standard for domestic heating with industry-leading DHW flow performance, advanced water control, and next-generation hydrogen-ready compatibility.
Designed for large homes or multi-bathroom properties, this combi boiler delivers up to 22.1 liters per minute at a 35°C rise, supporting simultaneous use across three bathrooms.
With ASME-certified stainless steel heat exchangers, a 15:1 turndown ratio, and flow adjustment and auto-mixing valves, it provides pinpoint temperature control and highly efficient energy use.
A built-in DHW recirculation pump and NaviCirc system reduce water waste while ensuring instant hot water delivery. A digital display with a setup wizard simplifies installation and operation, while hydrogen-ready support for 20% blends guarantees long-term sustainability.
The 94% ErP rating and optional A+ efficiency with Smart Plus thermostats make this one of the most efficient combi boilers in its class—backed by a 12-year warranty for lasting peace of mind.
Key Features
Industry-Leading Flow Rate – 22.1 LPM at 35°C rise for 3-bathroom use
Built-In DHW Recirculation Pump – Reduces water waste and speeds up delivery
ASME Stainless Steel Heat Exchangers – Long-term reliability and optimal efficiency
15:1 Turndown Ratio – High modulation for precise, responsive performance
Hydrogen Ready – Future-proofed for 20% hydrogen blends
NaviCirc Hot Water Return System – Simple setup for recirculation integration
Digital Display Panel – Built-in setup wizard for fast and intuitive operation
High Efficiency – 94% ErP and A+ with Smart Plus thermostats
12-Year Warranty – Long-term coverage from a trusted manufacturer
Applications
Luxury and Multi-Bathroom Homes – Delivers consistent pressure and flow across large properties
Sustainable Heating Projects – Hydrogen-ready and water-saving features for eco-conscious living
Advanced Heating Installations – Compatible with multizone Smart Plus thermostat systems
Technical Specifications:
| Feature | Details |
|---|---|
| Product Name | Navien NCB700 3S+/54K 54kW Combi Boiler |
| Model Number | PNCB7000054L001 |
| Fuel Type | Natural Gas / LPG |
| Heat Output (CH) | 54 kW |
| DHW Output (Min/Max) | 3.5 / 54.0 kW |
| DHW Flow Rate (35°C Rise) | 22.1 l/min |
| CH Condensing Max Output | 37.1 kW |
| ERP Rating | A (A+ with Smart Plus thermostats) |
| Noise Level | 51 dBA |
| Max Vertical Flue (125mm) | 70 meters |
| Max Vertical Flue (100mm) | 21 meters |
| Max Horizontal Flue (100mm) | 21 meters |
| NOx Class | 6 |
| Solar Compatible | Yes |
| Dimensions | 695mm (H) × 440mm (W) × 353mm (D) |
| Warranty | 12 Years |
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