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City Plumbing GB£1,825.20Visit shop Navien Blue/Light 21Kw Oil System Boiler Internal Lcb 700 Ls Plcb0021sh001
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The Navien 21kW System Boiler Internal LCB 700 LS is designed for homeowners with larger properties needing reliable central heating and abundant hot water, particularly those with multiple bathrooms. Its key benefit is an exceptional A+ energy rating, achieved when paired with three Smart Plus room thermostats, leading to significant energy savings and reduced emissions. A potential caveat is its requirement for a hot water cylinder to function as a system boiler. This boiler utilizes Blue Flame technology for superior efficiency and ultra-low NOx emissions, features a lightweight design for easier installation, and offers flexible flue arrangements.
| Model Part Number | PLCB0021SH001 |
|---|---|
| Brand | Navien |
The primary advantage is its exceptional A+ energy rating, offering significant cost savings and environmental benefits through its advanced Blue Flame technology and efficient design.
Yes, as a system boiler, the Navien LCB700 LS works in conjunction with a separate hot water cylinder to store and provide domestic hot water.
HVO compatibility means the boiler is designed to run on Hydrotreated Vegetable Oil, a more sustainable biofuel, making it a future-proof heating solution.
The A+ energy rating is achieved when the boiler is installed with three Navien Smart Plus room thermostats, optimizing heating control and efficiency.
The boiler supports flue venting up to 21 meters in both horizontal and vertical arrangements, offering flexibility in installation location.
While efficient, this 21kW system boiler is best suited for larger homes requiring substantial central heating and hot water, especially those with multiple bathrooms.
For optimal performance, safety, and efficiency, annual servicing by a qualified heating engineer is strongly recommended.
Check the power supply and ensure the thermostat is set correctly and calling for heat. Verify oil supply levels and the condition of the oil filter. Consult the user manual for specific error codes.
Check that the hot water cylinder is adequately heated and that the system's water pressure is within the recommended range. Ensure all thermostatic radiator valves (TRVs) are open. If using a programmer, verify the heating and hot water schedules.
Rumbling or banging noises can indicate limescale buildup. Gurgling may be related to air in the system. It is recommended to contact a qualified heating engineer for diagnosis and repair.
Check for leaks in the radiators or pipework. The filling loop may need to be opened to repressurise the system. Refer to the boiler's manual for the correct procedure. If pressure drops repeatedly, a leak may be present.
Setup: The Navien LCB700 LS features a lightweight design and integrated connections like the combined PRV/condensate drain to simplify installation. Flexible pipework arrangements and flue venting options up to 21 meters (horizontal and vertical) offer considerable flexibility in placement, whether in a kitchen or utility room. Ensure the unit is installed by a qualified heating engineer.
Compatibility: This system boiler requires a compatible hot water cylinder for operation. For optimal energy efficiency (A+ rating), it must be installed with three Navien Smart Plus room thermostats. The boiler is also HVO compatible.
Care: Regular annual servicing by a qualified engineer is recommended to maintain optimal performance and efficiency. Clean the exterior casing with a damp cloth. Avoid abrasive cleaners. Ensure the area around the boiler is kept clear of obstructions for proper ventilation.
