What temperature should my boiler be set at?

Boilers come in all shapes and sizes, with lots of features or just a few. If you want to know what temperature should a condensing boiler be set at, or any kind of boiler, this guide will give you a good idea.


An important thing to consider: Setting your boiler’s temperature higher will give you hot radiators, but it could decrease its efficiency. Ramping up the temp to max could decrease it by up to 20%, and send your heating bills skyrocketing. If you want a lovely warm home and a long-lasting boiler, it’s about getting the right balance.


What temperature should my boiler be set at in winter?


We all want to stay cosy in the winter. Some cosier than others. There’s no magic number for the ideal temperature. If you’re looking for a good balance of warmth and efficiency, you want to set your boiler to at least 65°C. Setting it a few degrees higher won’t hurt. But it’s important not to set it any lower than that. This is so bacteria in the water doesn’t grow, and cause nasty things like Legionella.


For those who like things hot, it is tempting to set your boiler temp higher in the winter. However, there is a chance this will start to stress out your boiler. An overworked boiler will likely have a reduced lifespan, decreased efficiency, and be more prone to breakdowns and repairs.


What temperature should my boiler be set at in summer?


In summer, you’re less likely to have the radiators on. If you are, you’ll probably not want them to be radiating at the heat of a blast furnace. Like in winter, if you want to know what temperature a condensing boiler should be set at, make sure it’s no lower than 65°C.


This inhibits the growth of harmful bacteria in your water supply, so keep it at 65°C and no lower.


What is the best temperature setting for central heating?


When it comes to setting room temperature, the sweet spot is between 18°C and 21°C. This is within most people’s comfort zone. For bedroom temperatures, if possible, you want it around 16°C to 19°C. This is the best temperature for a good night’s sleep, according to the Sleep Foundation. Keeping the thermostat between those limits is the best temperature setting for central heating, and makes for a happy, comfortable home.

How to change the temperature on my boiler

Related FAQs

Should I turn off my boiler in the summer?

Generally, it is best to keep your boiler switched on even during the summer months, however this can depend on your home and your circumstances.

Is a condensing boiler a combi boiler? 

Is a condensing boiler the same as a combi boiler? The short answer is yes. However, there are 3 types of condensing boilers.

Why should I get the water in my central heating system cleaned?

If your boiler breaks down due to sludge in the system, the repair work is not covered under your warranty and can lead to expensive repair bills as a result.

Why should I have a filter fitted?

Many boiler breakdowns occur due to sludge in the heating system. A magnetic filter is an effective way of preventing this sludge from accumulating, and may prevent costly breakdowns at a later stage.

How often should I have my boiler serviced?

We advise you have your boiler serviced every year in accordance with the manufacturer’s instructions and to keep your warranty valid.

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