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Best Settings for Your Worcester Combi Boiler


For most homeowners in the UK with no more than 2 bathrooms in their properties, the Combination (Combi) boiler is the most popular boiler installed in the UK. Worcester Bosch is also the most popular boiler brand in the UK, so we thought it would make sense to outline what the best settings are to warm your house, heat water and improve efficiency. 

We will be going over the optimal settings for both your hot water and central heating needs. We also look into controls and features such as Load Compensators and Wireless Plugin Controllers which do not only save you money but are good for the environment.

Settings for Your Central Heating System

With a Worcester Bosch Combi boiler, you have the advantage of controlling the period you want the radiators to be working based on a 24-hour clock system. This means that you can regulate your radiators to go off when you are not home and program the thermostat to increase the temperature when you are around. 


During the winter, the ideal temperature setting should be 18-21 degrees. In areas that get extremely cold, then 21-23 degrees would be sufficient. If you have taken additional measures to retain heat such as wall insulation or draught-proofed windows and doors, then you could set your thermostat to 17 degrees. It might not seem like much but according to Worcester News, reducing the temperature by just 1 degree could result in heating bill savings of up to 10%, not to mention the environmental benefits this would have.

Settings For Your Water

Best Settings for Your Worcester Combi Boiler

For your hot water needs, we recommend setting your boiler at 55 – 60 degrees which is sufficient enough for most homeowners in the UK. Generally, combi boilers do not come with a hot water cylinder as they heat water on demand but some large boilers might have a storage component. This temperature would be ideal to eliminate the presence of Legionnaires Disease, a form of Pneumonia caused by bacteria in the water.

Best Settings for Worcester Bosch Smart Devices

Worcester Bosch Boilers come with highly advanced smart devices that enable you to program your boiler, even when you are not around. Some of these devices can adjust the settings of your boiler through wireless communications between the thermostat and a temperature sensor.

Ideal settings Programmable Room Thermostats

These are perhaps the best controls you could ever invest in to save costs on your energy bills. Programmable room thermostats, for one, allow you to heat a house from a reasonable temperature rather than a cold start. This is good, because most homeowners can relate to the long wait in the debilitating cold as the house warms up. 


The thermostats also ensure your boiler reaches the maximum temperature you had set it at. If you had set your temperature at 21 degrees, then your central heating will cap off at that temperature. Lastly, room thermostats allow you to set the ideal temperature of a particular room. If for instance, there is a room that is not used frequently, you could set the thermostat at a lower temperature in that particular room. If the rest of the house is 20 degrees, the empty room should be 10 degrees and it is best if you left the door shut.

Ideal Settings for a Mechanical RF Thermostat

Worcester Bosch utilizes the Worcester MT10RF as its Mechanical Room Thermostat. The MT10RF allows you to control the temperature of your central heating during the day and at night. The central heating comes on and off based on the time settings and the programming during the day or at night. 


During the day, you could set your Worcester Combi Boiler at a temperature of 6 to 8 degrees if you are not home. At night when you are covered up, you can lower the temperature to 14 or 15 degrees.

Best settings for a Worcester Bosch wave system

Best Settings for Worcester Bosch Wave System

This is another invaluable control that allows you to regulate your central heating and hot water from anywhere across the world. 

Based off of heating and hot water charts, the system allows you to regulate temperature and save on energy bills. 


The system also enables your Worcester Bosch Greenstar Combi boiler to achieve an A+ efficiency rating. With the system, you can also activate holiday mode which ensures your boiler is running just enough to prevent the valves and other components from seizing up. During the winter, it would be best to set your thermostat at a minimum temperature of 5 degrees to prevent the boiler and pipework around your house from freezing.

Ideal Settings for a weather compensation controller

Weather Compensators work alongside an outdoor sensor that monitors the weather. It is quite similar to a load compensator only that with weather compensators, the outdoor sensor monitors the temperatures outside. When the temperature outside drops, your central heating increases its output to produce more heat. When the temperature increases, the central heating output is decreased. 


Worcester Bosch boilers come with a Greenstar Sense II compensator which is highly advanced. As a thermostat, Greenstar Sense comes with six settings that allow a user to tailor the heating system according to their needs. The controller can potentially increase energy efficiency by 4%.

Load compensation controls

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This is another valuable control that can help you save loads on your energy bills. Load compensators work by regulating the radiator output in a room. If the temperature in the house decreases, the radiators will increase their output and release more heat. When the temperature in the house goes down, the radiators decrease their output and release less heat.

Ultimately, the best settings for your boiler depend on your central heating and hot water needs. Having a thermostat at a temperature ranging between 18 degrees to 23 degrees and hot water ranging between 55 degrees to 60 degrees gives you a ballpark estimate. You can also improve the efficiency of your boiler with other controls such as Programmable Room Thermostats and Weather or Load Compensation controls. Increasing the efficiency of your boiler not only saves you money but your boiler becomes more eco-friendly.

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