Ideal Logic Heat H18 Boiler Instruction Manual
Ideal Logic Heat H18 Boiler
Ideal Logic Heat H18 Boiler
Ideal Logic Heat H18 Boiler
Ideal Logic Heat H18 Boiler
Ideal Logic Heat H18 Boiler Instructions
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Ideal Logic Heat H18 Boiler Specifications
| Feature | Specification |
|---|---|
| Boiler Type | Wall-mounted, heat only, condensing, fan-assisted, room-sealed gas boiler |
| G.C. Appliance No. (Benchmark No.) | 41-860-12 |
| Rated Heat Output | 18 kW |
| Nominal Heat Output (Full Load / Part Load) | 18.1 kW / 5.8 kW |
| Boiler Input Net CV (Min / Max) | 4.9 kW / 18.1 kW |
| Boiler Input Gross CV (Min / Max) | 5.4 kW / 20.1 kW |
| Gas Consumption (Min / Max) | 0.500 m³/h / 1.872 m³/h |
| Output, Non-Condensing (70°C Mean Water Temp.) | 4.8 kW – 18.0 kW |
| Output, Condensing (40°C Mean Water Temp.) | 5.1 kW – 19.1 kW |
| Seasonal Space Heating Energy Efficiency (ηs) | 93% (product fiche); 94% (spec sheet) |
| Seasonal Space Heating Efficiency Class | A |
| Useful Efficiency (Full Load / Part Load) | 89.8% / 98.5% |
| SEDBUK 2005 / SEDBUK 2009/2012 | 91.1% / 89.7% |
| Annual Energy Consumption (QHE) | 55 GJ |
| Sound Power Level, Indoors (LWA) | 44 dB (41 dB(A) per spec sheet) |
| NOx Emissions (Gross) | 24 mg/kWh |
| NOx Classification | Class 6 |
| CO2 Content (± 0.7) | 9.3% max CH / 8.7% min CH |
| Average Flue Temperature – Mass Flow Rate | 58°C – 8 g/s |
| Gas Supply | 2H – G20 – 20 mbar (Natural Gas); LPG conversion available |
| Minimum Inlet Operating Pressure | 18 mbar at appliance inlet (full output down to 14 mbar) |
| Injector Size | 4.15 mm |
| Gas Supply Connection | 15 mm copper compression |
| Flow / Return Connections | 22 mm copper compression |
| Central Heating Flow Temperature Range | 30°C – 80°C |
| Room Temperature Range (Outside Sensor Connected) | 10°C – 30°C |
| 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 |
| Electrical Supply | 230 V ~ 50 Hz |
| Power Consumption | 25 W |
| Auxiliary Electricity (Full Load / Part Load / Standby) | 0.025 kW / 0.004 kW / 0.002 kW |
| Fuse Rating | External: 3 A; Internal: T4A HRC L250 V |
| Electrical Protection | IP20 |
| Flue Type / Terminal Diameter | C13, C33, C53 concentric; 100 mm |
| Maximum Effective Flue Length | Horizontal 9.0 m; Vertical 7.5 m |
| Flue Elbow Equivalence | 45° = 0.6 m; 90° = 1.0 m |
| Casing Dimensions (H x W x D) | 700 x 395 x 278 mm |
| Lift Weight / Packaged Weight | 21.9 kg / 25.1 kg |
| Servicing Clearances | 165 mm above, 100 mm below, 2.5 mm sides, 450 mm front |
| Condensate Trap / Drain Outlet | 75 mm siphonic trap; 21.5 mm overflow pipe fitting |
| Destination Country | GB |
Ideal Logic Heat H18 Boiler Details
The Ideal Logic Heat2 H18 is a heat only boiler. It supplies central heating and, when a separate cylinder is installed, domestic hot water. It uses full-sequence automatic spark ignition with a single combined spark and detection electrode. A 1:1 gas valve controls the air-gas ratio, and the valve is set at the factory. There is no internal pump, so the boiler depends on a system pump. It can be fitted to fully pumped open vented or sealed systems, but not to systems with gravity circulation.
The front panel has a temperature knob, a Mode button, a Restart button, a burner indicator and a high-resolution status display. If the boiler fails to light after five attempts, it locks out and shows L 02. Pressing Restart repeats the ignition sequence. If Restart is pressed five times within 15 minutes, the display shows L 0C, and the power must be switched off and on again. Fault codes starting with F and lockout codes starting with L help the user and the engineer find the cause.
Frost protection works in every mode as long as the boiler has a permanent live supply. When the water in the boiler drops below 5°C, the boiler fires and runs until the water reaches 19°C. As a self-check, the boiler pump runs briefly once every 24 hours whether or not there is heat demand. The manual says that lowering the room thermostat by 1°C can cut gas consumption by up to 10%.
Intelligent Load Optimisation reduces on-off cycling. If the flow temperature reaches the CH target plus 4°C, the boiler shuts down. When it relights, it moves to minimum rate over 60 seconds and stays there for 10 minutes. Normal operation resumes after those 10 minutes, or after CH demand has been off for more than one hour. This helps when the heat load is lower than the boiler's minimum output.
The boiler works with OpenTherm controls, an outside weather compensation sensor, the Halo range and the Link remote monitoring solution. Installer mode offers 2x Switched Live operation. In this mode, sL1 carries the CH/DHW demand and sL2 carries the DHW demand. An optional pump overrun kit (221792) keeps water circulating for 4 minutes after shutdown. This prevents overheat lockouts on pipe layouts where natural circulation cannot get rid of leftover heat.
A siphonic condensate trap lowers the risk of freezing. If the external pipe freezes, the boiler gurgles and then locks out. You can thaw the pipe with warm water or a heat pack, but never with boiling water. Internal condensate pipe must be at least 19 mm ID. External pipe must be at least 30 mm ID, with a fall of at least 52 mm per metre. Horizontal flues need a 1.5° fall back to the boiler.
To access installer mode, hold Mode and Restart together for more than 5 seconds. This shows the last three faults and gives access to the maximum-rate (SH) and minimum-rate (SL) functions used for combustion checks. At commissioning, CO must be below 350 ppm and the CO/CO2 ratio below 0.0040. The approved inhibitors include Fernox, Sentinel X100, Adey MC1, Scalemaster SM-1 PRO and Calmag CM100. Do not fill the system with artificially softened water.
Frequently Asked Questions (FAQs)
Can't find the answer you need? Here are some frequently asked questions about the Ideal Logic Heat H18 Boiler, and we answer them below.
