Here is a real engineers view of the practicalities of purchasing an Ideal Logic combi boiler.
Output Capabilities & Real-World Sizing
While the central heating (CH) output remains fixed at 24.2kW across the entire range, the primary differentiator between models is the Domestic Hot Water (DHW) capacity. Your selection must be based on hot water demand rather than heating requirements.
| Model | DHW Output (kW) | Typical Flow Rate (L/min) |
| Logic C24 | 24.0 kW | ~10.5 L/min |
| Logic C30 | 30.0 kW | ~12.5 L/min |
| Logic C35 | 35.0 kW | ~14.5 L/min |
- Note: Actual flow rates are subject to incoming mains water temperature; lower winter temperatures will reduce the effective liters per minute compared to summer performance.
If your current system is struggling to provide consistent hot water, you may require a new combi boiler installation with a higher kW rating to meet your household’s peak demand.
Physical Footprint & Installation Clearances
- Dimensions: 700 x 395 x 278 mm
- Lift Weight: 28 kg (optimized for single-man installation)
- Minimum Front Clearance: 5 mm (required for cupboard fits)
- Minimum Side Clearances: 2.5 mm
The front-access diverter valve design significantly expedites annual boiler servicing. This strategic layout provides engineers with immediate access to critical internal components, allowing for rapid inspections and streamlined maintenance that reduces both labor time and system downtime.
Common Ideal Logic Combi Boiler Fault Codes
• F1: Low Water Pressure. This code indicates that the system pressure has fallen below the operational threshold. While topping up the mains pressure may provide a temporary fix, frequent or repeated F1 faults suggest a deeper systemic issue. You must investigate the expansion vessel pre-charge levels or inspect the Pressure Relief Valve (PRV) for leaks or failure.
• F2: Flame Failure/Loss of Ignition. This lockout occurs when the boiler fails to detect a flame during the ignition sequence. The primary cause is often an interruption in the gas supply or a faulty gas valve. Ensure your gas meter is active and check for any localised obstructions before inspecting the internal valve components.
• F3: Fan/Airflow Fault. This error signifies a failure in the combustion air process, typically caused by a malfunctioning fan or a blockage in the flue system. If the fan fails to reach the required RPM, the boiler will lock out to prevent dangerous combustion issues.
If you encounter these Ideal Logic fault codes, speak to a qualified processional for emergency boiler diagnostics.
The Warranty Gap: Standard vs. Logic+ vs. Logic Max
Choosing the right tier of Ideal boiler depends on your long-term budget and protection needs. The standard Logic model offers a baseline 2-year warranty and utilises a plastic hydroblock, making it a lower initial investment but offering less longevity. In contrast, the Logic Max is designed for durability, providing a substantial 10-year warranty.
The technical advantage of the Max lies in its integrated protection. Upgrading to the Max includes an Ideal System Filter, their robust brass component engineered filter to trap iron oxide sludge. This prevents debris from damaging the plate heat exchanger, ensuring peak efficiency. For those seeking maximum reliability, the Logic Max is the optimal long-term choice. If you already own a standard model, consider a magnetic system filter installation to extend its lifespan.