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City Plumbing GB£1,659.60Visit shop Navien Blue 21Kw Internal Heat Only Boiler Lcb 700 Rs Plcb0021sh003
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The Navien LCB700 Blue Flame 21kW is a heat-only oil boiler designed for homeowners seeking an energy-efficient and future-proof heating solution. It offers an A+ energy rating when installed with three Smart Plus room thermostats, significantly reducing energy consumption. While it excels in efficiency and smart features, its heat-only nature means it requires a separate hot water cylinder, making it best suited for homes with existing hot water systems or those undertaking renovations.
| Model Part Number | PLCB0021SH003 |
|---|---|
| Brand | Navien |
A heat-only (or regular) boiler heats water that is stored in a separate hot water cylinder. It does not heat domestic hot water directly from the mains. This is a traditional system often found in older properties.
An A+ energy rating signifies high energy efficiency. The Navien LCB700 achieves this when installed with three Navien Smart Plus room thermostats, meaning it converts a larger percentage of the energy it consumes into heat for your home, leading to lower fuel bills and reduced environmental impact.
This boiler is ideal for homes that already have or can accommodate a separate hot water cylinder. It's particularly well-suited for retrofitting into existing systems and for new builds or renovations where space for a cylinder is planned.
The Navien Smart Plus app allows you to control your heating system remotely via your smartphone or tablet. You can adjust temperatures, set schedules, and monitor energy usage. Refer to the app's specific instructions for setup and full functionality.
HVO (Hydrotreated Vegetable Oil) is a sustainable, renewable biofuel. Being HVO compatible means your boiler can run on this cleaner alternative to traditional heating oil, making it a more environmentally friendly option for the future.
No, the Navien LCB700 is a heat-only boiler and requires a separate hot water cylinder to be installed. This cylinder is not included with the boiler itself.
Annual servicing by a qualified heating engineer is recommended to ensure optimal performance, safety, and longevity. This typically includes cleaning key components, checking safety devices, and inspecting the overall system.
Check the oil supply, ensure the thermostat is calling for heat, and verify the mains power switch is on. If the issue persists, consult the user manual or a qualified engineer.
Ensure the hot water cylinder is correctly connected and being heated. Check the system pressure gauge on the boiler. Bleed any air from the system if necessary. Inspect the hot water cylinder thermostat.
These could indicate air in the system, low water pressure, or a fault with the pump or fan. Bleed radiators, check system pressure, and if noises continue, contact a qualified engineer.
Refer to the Navien LCB700 user manual for a detailed explanation of the specific error code. Often, a simple reset might resolve minor issues, but persistent codes require professional diagnosis.
Ensure radiators are not blocked and are bled of air. Check that the boiler's output is sufficient for the property size. Ensure the thermostat is set correctly and functioning.
Setup:
The Navien LCB700 Blue Flame 21kW boiler is designed for ease of installation, featuring a lightweight design and flexible pipework options. It requires connection to an oil supply, a standard heating circuit, and a separate hot water cylinder. For optimal performance and to achieve the A+ energy rating, installation must include three Navien Smart Plus room thermostats.
Compatibility:
Care:
Regular maintenance is crucial for ensuring the boiler's longevity and efficiency. We recommend an annual service by a qualified heating engineer. This should include:
