Stellina GT20 - Boiler Intergas - Free user manual and instructions
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| Product Type | Gas Condensing Boiler |
| Model | Stellina GT20 |
| Brand | Intergas |
| Heating Output (Nominal) | 20 kW (adjustable range 5-24 kW) |
| Domestic Hot Water Output | 28 kW (instantaneous) |
| Efficiency Class | A+ (ErP ready) |
| Dimensions (H x W x D) | 800 x 440 x 350 mm |
| Weight | 38 kg |
| Power Supply | 230 V / 50 Hz |
| Electrical Protection | IPX4D |
| Gas Type | Natural Gas (G20) / LPG (G31) convertible |
| NOx Class | 6 (low emissions) |
| Heat Exchanger | Stainless steel (primary and DHW plate) |
| Control System | Electronic modulation with weather compensation |
| Display | LCD with fault codes and status |
| Max Flow Temperature | 85°C |
| Max Operating Pressure | 3 bar |
| Expansion Vessel Capacity | 8 liters |
| Maintenance Frequency | Annually recommended |
| Warranty | 2 years (parts and labor) |
Frequently Asked Questions - Stellina GT20 Intergas
How do I reset the boiler after a lockout?
Press and hold the reset button on the control panel for 3 seconds. If it locks out again, check for error codes on the display and consult the manual.
What does error code E01 mean?
Error code E01 indicates a flame detection failure. Ensure gas supply is on and the ignition electrode is clean. If persistent, call a service engineer.
Can I use the boiler with underfloor heating?
Yes, the Stellina GT20 is compatible with underfloor heating. You must install a mixing valve or use a low-temperature control system to avoid high flow temperatures.
How often should I service the boiler?
Intergas recommends an annual service by a qualified engineer. This ensures efficiency, safety, and warranty validity.
What type of flue is required?
The boiler is designed for a balanced flue (concentric 60/100 mm). Ensure proper routing to external air inlet and exhaust.
How do I adjust the hot water temperature?
Use the DHW temperature knob on the control panel. Turn clockwise to increase, counterclockwise to decrease. Range typically 35-65°C.
The boiler is making a kettling noise. What should I do?
Kettling noise is often due to limescale buildup on the heat exchanger. Descaling may be required. Contact a service technician.
How do I check the system pressure?
Read the pressure gauge on the front panel. Normal operating pressure is 1.0-1.5 bar when cold. If below 0.5 bar, repressurize using the filling loop.
Can I connect a thermostat to this boiler?
Yes, the boiler has terminals for a room thermostat (24V or wireless). Follow wiring diagram in the manual for proper connection.
What should I do if the boiler leaks water?
Turn off the boiler and isolate the water supply. Check for loose connections or damaged seals. Call a professional if you cannot identify the source.
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