Ultracom2 12sxi - Central heating boiler Glow-worm - Free user manual and instructions
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| Product Type | Central Heating Boiler |
| Brand | Glow-worm |
| Model | Ultracom2 12sxi |
| Heat Output | 12 kW |
| Fuel Type | Natural Gas or LPG (convertible) |
| Energy Efficiency | Up to 90% (condensing) |
| Dimensions (H x W x D) | 700 x 400 x 300 mm |
| Weight | 30 kg |
| Power Supply | 230 V / 50 Hz |
| Central Heating Flow/Return | 22 mm compression |
| Expansion Vessel Capacity | 8 liters |
| Maximum Operating Pressure | 3 bar |
| Temperature Range (Heating) | 30 °C to 80 °C |
| Main Functions | Central heating, frost protection, pump anti-seize |
| Safety Features | Overheat thermostat, pressure relief valve, flame failure device |
| Maintenance | Annual service recommended by qualified engineer |
| Spare Parts Availability | Genuine Glow-worm parts widely available |
| Repairability | Modular design, common parts easily replaceable |
| Warranty | 2 years (subject to registration) |
| Installation Requirements | Must be installed by Gas Safe registered engineer |
Frequently Asked Questions - Ultracom2 12sxi Glow-worm
How do I reset the boiler after a fault?
Press and hold the reset button on the control panel for 3 seconds. If the fault persists, consult the manual.
What is the recommended water pressure?
The system pressure should be between 1.0 and 1.5 bar when cold. Adjust via the filling loop.
Can I use the boiler during a power cut?
No, the boiler requires 230V electrical supply to operate. It will not function without power.
How often should the boiler be serviced?
We recommend an annual service by a Gas Safe registered engineer to maintain efficiency and safety.
What does error code E119 mean?
Error E119 indicates a flame detection fault. Check the gas supply and ignition electrodes, or call a service engineer.
Is the boiler suitable for a combi system?
No, the Ultracom2 12sxi is a system boiler for central heating only. It requires a separate hot water cylinder.
What is the maximum radiator output?
With 12 kW output, it can typically support up to 10 radiators depending on size and heat loss.
How do I adjust the heating temperature?
Use the temperature control dial on the front panel. Turn to desired setting (30-80 °C).
Can I use antifreeze in the system?
Yes, use a proprietary central heating antifreeze suitable for aluminium heat exchangers. Follow manufacturer instructions.
Where can I find the serial number?
The serial number is on the data badge located on the back of the boiler casing or inside the lower door.
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