Ideal Logic Heat H24 Boiler Instruction Manual
Ideal Logic Heat H24 Boiler
Ideal Logic Heat H24 Boiler
Ideal Logic Heat H24 Boiler
Ideal Logic Heat H24 Boiler
Ideal Logic Heat H24 Boiler Instructions
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Ideal Logic Heat H24 Boiler Specifications
| Feature | Specification |
|---|---|
| Boiler Type | Wall-mounted, heat-only condensing gas boiler with fan-assisted combustion and full-sequence automatic spark ignition |
| G.C. Appliance No. (Benchmark No.) | 41-860-13 |
| Appliance Category | C13, C33, C53 (room sealed); I2H |
| Gas Supply | 2H – G20 – 20 mbar (Natural Gas); LPG conversion available |
| Minimum Inlet Gas Pressure | Full output at inlet pressures as low as 14 mbar (1:1 gas valve); 18 mbar minimum permitted operating pressure at appliance inlet |
| Gas Supply Connection | 15 mm copper compression |
| Flow / Return Connections | 22 mm copper compression |
| Injector Size | 4.15 mm |
| Boiler Input (Net CV) Min / Max | 4.9 kW / 24.3 kW |
| Boiler Input (Gross CV) Min / Max | 5.4 kW / 27.0 kW |
| Gas Consumption Min / Max | 0.500 m³/h / 2.512 m³/h |
| CH Output – Non-Condensing (70°C mean) | 4.8 – 24.2 kW |
| CH Output – Condensing (40°C mean) | 5.1 – 25.6 kW |
| Nominal Heat Output (ErP) Full / Part Load | 24.3 kW (P4) / 7.8 kW (P1) |
| Central Heating Flow Temperature Range | 30°C – 80°C |
| SEDBUK 2005 / SEDBUK 2009/2012 | 91.2% / 89.7% |
| Seasonal Space Heating Energy Efficiency (ηs) | 94% |
| Seasonal Space Heating Efficiency Class | A |
| Useful Efficiency Full / Part Load | 90.0% (η4) / 98.6% (η1) |
| Annual Energy Consumption (QHE) | 75 GJ |
| NOx Emissions / Class | 28 mg/kWh (gross) / Class 6 |
| CO2 Content (±0.7) | 9.3% max CH / 8.4% min CH |
| Average Flue Temperature – Mass Flow Rate | 63°C – 10 g/s |
| Sound Power Level, Indoors (LWA) | 50 dB |
| Electrical Supply | 230 V ~ 50 Hz |
| Power Consumption | 46 W |
| Auxiliary Electricity Full / Part Load / Standby | 0.046 kW / 0.013 kW / 0.002 kW |
| Fuse Rating | External: 3 A; Internal: T4A HRC L250 V |
| Maximum Working Pressure (Sealed Systems) | 2.5 bar (36.3 psi) |
| Water Content (Central Heating) | 1.2 litres (0.26 gal) |
| Heat Exchanger Material | Cast aluminium |
| Casing Dimensions (H x W x D) | 700 x 395 x 278 mm |
| Packaged Weight / Lift Weight | 25.1 kg / 21.9 kg |
| Flue Terminal Diameter | 100 mm |
| Maximum Effective Flue Length | Horizontal: 9.0 m; Vertical: 7.5 m |
| Flue Elbow Equivalent Length | 45° elbow: 0.6 m; 90° elbow: 1.0 m |
| Flue Hole Diameter | 127 mm core drill |
| Servicing Clearances | 165 mm above, 100 mm below, 2.5 mm sides, 450 mm front |
| Condensate Trap | 75 mm siphonic trap; outlet sized for 21.5 mm overflow pipe |
| Electrical Protection | IP20 |
| Frost Protection | Built in; activates below 5°C |
Ideal Logic Heat H24 Boiler Details
The Ideal Logic Heat2 H24 is a heat-only boiler. It supplies radiators and heats stored water through a separate cylinder. It has no integral pump, so it relies on a system pump fitted on the flow side. The controls are simple: a temperature knob, a Mode button, a Restart button and a status display with a burner indicator. If the boiler fails to light after five attempts, it locks out with code L 02. Five restarts within 15 minutes triggers L 0C, which clears when the power is switched off and on again.
When an outside sensor is connected, the knob sets a nominal room temperature between 10°C and 30°C instead of the flow temperature, and the flow to the cylinder is factory set to 80°C. When no outside sensor is fitted, installers can enable 2x Switched Live operation. sL1 then carries the combined CH/DHW demand and sL2 carries the DHW demand. The wiring centre accepts OpenTherm controls, Ideal's Halo range and the Link remote monitoring solution, and it can take cables up to 5-core.
Intelligent Load Optimisation reduces short cycling. If the flow temperature reaches the CH target plus 4°C, the burner switches off. When it relights, it drops to minimum rate within 60 seconds and stays there for 10 minutes. Normal operation resumes after those 10 minutes or once the CH demand has been off for more than an hour. After the burner stops, the pump runs on for two minutes. The fan also has an overrun cycle, so the mains supply should not be cut while it is running.
Because there is no built-in pump overrun, systems where the pipes turn horizontally close to the top of the boiler can suffer overheat lockouts. Ideal offers pump overrun kit 221792 for these systems. It keeps water circulating for 4 minutes after shutdown. The user guide also describes a daily self-check in which the pump runs briefly once every 24 hours. Frost protection fires the boiler when its water drops below 5°C and runs until it reaches 19°C, but only if the boiler has a permanent live supply.
The 75 mm siphonic condensate trap lowers the risk of freezing. If the external pipe does freeze, the boiler gurgles and then locks out. Thaw the pipe with warm water, a hot water bottle or a heat pack, but never boiling water. Condensate pipework must be plastic, at least 19 mm ID inside the building and 30 mm ID outside, with a fall of at least 52 mm per metre. Flue options include a telescopic horizontal flue, a vertical flue, a balcony kit, a soffit kit and a compact rear outlet kit (55/80).
For servicing, installer mode opens when Mode and Restart are held together for more than 5 seconds. It shows the last three faults and can force the burner to maximum (SH) or minimum (SL) rate for 10 minutes to allow combustion testing. The CO/CO2 ratio must stay below 0.004 and CO below 350 ppm. Approved inhibitors include Fernox, Sentinel X100, Adey MC1, Scalemaster SM-1 PRO and Calmag CM100. Do not fill the system with artificially softened water. The warranty requires Benchmark commissioning, registration and an annual service.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Ideal Logic Heat H24 Boiler, and we answer them below.
