Worcester 25Si COMPACT Product Guide

Worcester 25Si COMPACT Boiler manual cover
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Worcester 25Si COMPACT Boiler Specification

The Worcester 25Si COMPACT Boiler is a highly efficient, wall-mounted gas combination boiler designed for space-saving convenience and optimal performance in residential settings. It offers a maximum central heating output of 24 kW and a domestic hot water output of 25 kW, making it suitable for small to medium-sized homes with one bathroom. The boiler features a compact design, measuring approximately 690 mm in height, 390 mm in width, and 280 mm in depth, allowing for installation in tight spaces such as kitchen cupboards.

The 25Si COMPACT incorporates a modulating pump that enhances efficiency by adjusting its operation according to the heating demand, reducing energy consumption and lowering utility bills. Its user-friendly interface includes a digital display with simple controls for easy temperature adjustments and system monitoring. The boiler is compatible with a range of smart thermostats, including Worcester’s own Wave smart control, enabling remote operation and further energy savings.

Safety and reliability are prioritized with built-in frost protection and a range of diagnostic features that facilitate maintenance and troubleshooting. The appliance is ErP compliant, achieving an A-rating for both heating and hot water efficiency, and produces low NOx emissions, contributing to a reduced environmental footprint. The Worcester 25Si COMPACT is equipped with a 5-year standard warranty, extendable with annual servicing from qualified technicians, ensuring longevity and peace of mind for homeowners. Its combination of compact design, efficiency, and advanced controls makes it an ideal choice for modern living spaces seeking a balance between performance and convenience.

Worcester 25Si COMPACT Boiler F.A.Q.

How do I set the timer on my Worcester 25Si COMPACT Boiler?

To set the timer, locate the timer control panel on the boiler. Use the dial to select the current time. Then, adjust the small tappets around the dial to set on/off periods as desired.

What should I do if my Worcester 25Si COMPACT Boiler is not igniting?

First, check the gas supply and ensure it is turned on. Next, reset the boiler by pressing the reset button. If the issue persists, inspect the flame detection electrode for any debris or faults.

How can I increase the water pressure in my Worcester 25Si COMPACT Boiler?

Locate the filling loop, usually a silver flexible hose beneath the boiler. Slowly open the valves on both ends of the hose until the pressure gauge reads between 1 and 1.5 bar. Close the valves after reaching the desired pressure.

What maintenance steps should I regularly perform on my Worcester 25Si COMPACT Boiler?

Regularly check the pressure gauge, inspect for any leaks, and ensure that the flue is unobstructed. Schedule an annual service with a certified technician to ensure optimal performance.

How do I reset my Worcester 25Si COMPACT Boiler after a fault?

Press the reset button on the control panel and hold it for 3-5 seconds until the fault code clears. The boiler should attempt to restart.

Why is my Worcester 25Si COMPACT Boiler making a banging noise?

Banging noises could indicate kettling, caused by limescale buildup in the heat exchanger. Flushing the system or using a descaling solution may resolve the issue.

What does the error code 'EA' mean on my Worcester 25Si COMPACT Boiler?

Error code 'EA' indicates a flame detection fault. Check the gas supply, ensure the condensate pipe is not blocked, and inspect the flame sensor.

How do I bleed a radiator connected to my Worcester 25Si COMPACT Boiler?

Turn off the heating system and wait for the radiators to cool. Use a radiator key to open the bleed valve at the top of the radiator. Listen for air escaping and close the valve once water starts to flow steadily.

Why is my Worcester 25Si COMPACT Boiler losing pressure?

Pressure loss can result from leaks in the system, a faulty expansion vessel, or air trapped in the radiators. Inspect for visible leaks and bleed radiators if necessary.

Can I use a smart thermostat with my Worcester 25Si COMPACT Boiler?

Yes, a smart thermostat can be connected to your Worcester 25Si COMPACT Boiler. Ensure compatibility and follow the installation instructions provided by the thermostat manufacturer.