Combi Boiler Temperature Settings

The Ultimate Guide to Combi Boiler Temperature Settings in 2022

Looking for the best combi boiler temperature settings for your home?

Having your temperature settings too high can waste a lot of money, especially with the ridiculous price increases in the UK recently. Having them too low is good for your bank balance, but probably not good for your comfort.

As a heating engineer, I will tell you the most efficient combi boiler temperature settings to help keep things cosy, but also keep the gas bill down as much as possible. A large combi boiler can cost a lot more to run when the temperature is too high.

What’s the optimum Temperature to Set a Combi Boiler

The optimum temperature to set your combi boiler to is different to the optimum temperature you set the combi boiler thermostat to. These two are separate temperatures, which are often confusing for homeowners.

It varies, you can get large and small combi boilers, different system setups etc, but for most combi boilers, the optimum temperature to set your combi boiler to on the heating is 65 °C.

If your home doesn’t heat up quick enough, then turn it up. If the radiators are too hot to touch, and you don’t want the kids or pets to burn themselves, then turn it down a bit.

The optimum thermostat temperature for most people is normally 20 or 21 °C. This totally depends on your personal comfort zone, but the lower temperature you can handle the better.

How to Set the Flow Temperature on a Combi Boiler

How to set the flow temperature on a combi boiler is very straightforward. On most combi boilers, there are usually two dials, sometimes only one, and it will have a radiator icon for the heating. Turn this dial until you reach the desired temperature.

If there are no actual temperature numbers, having it set to around two-thirds of the maximum is normally the best flow temperature to set it at. Or set it to E if there is one there.

If you don’t have any dials to turn, then you will have buttons. You will need to press the buttons up or down to set the flow temperature you want. You might have to check the combi boiler manual if you are struggling.

What Temperature Should Hot Water be set at Combi Boiler

The standard for what temperature hot water should be set at is around 60 °C. If this is not hot enough, then turn the hot water temperature up, too hot? Turn it down.

It really doesn’t make much difference when it comes to gas usage what temperature the hot water should be set at, as it is not really on for prolonged periods of time, unlike the central heating.

Combi Boiler Hot water Temperature Too Hot

If your combi boiler’s hot water temperature is too hot, then the first thing you need to try is to turn the temperature down at the boiler. This could be a dial on the boiler or could be a button depending on which combi boiler you have.

You might have to check the boiler manual, as some combi boilers can be overcomplicated for such simple things as adjusting the water temperature.

Boiler problems.

If changing the temperature on the combi boiler does not change the temperature of the water coming out of the taps, then you have a problem, and you should call a heating engineer.

It’s impossible to know what the problem could be without looking, but it could be as simple as the plastic spindle on the temperature dial is broken, or the teeth that hold the spindle are worn down, but could also be something more serious like needing a new circuit board.

Combi Boiler Hot Water Temperature Fluctuates

If your combi boiler’s hot water temperature fluctuates, then there is a problem with the boiler or the water supply, and you will need a combi boiler repair engineer to have a look.

How to Use Combi Boiler Efficiently

If you do not have a room thermostat, then you should definitely get one. Having your heating on without anything to control the temperature is a bad idea.

The combi boiler heating temperature controls the temperature of the radiators, the room thermostat controls the temperature of the room that the thermostat is in.

The hotter you set the heating temperature to on the combi boiler, the hotter the radiators are to touch, and the quicker the room temperature will heat up.

If the room thermostat is set at 20 °C, the room thermostat will turn the heating off when the temperature in that room reaches 20 °C. When the temperature drops below 20 °C, the heating will come back on to keep it at 20 °C.

The hotter the temperature is set to on the combi boiler, the quicker the room will reach 20 °C, but it will never be more than 20 °C, even if set to 80 °C on the combi boiler, unless you change the temperature on the thermostat.

Having your combi boiler heating temperature set to the maximum will help heat your home up quicker, but it will also cost more money for gas, especially if you have a condensing combi boiler as it will not condense if it’s too hot.

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