What is a combi boiler’s optimum flow temperature?

Combi boilers are a common feature in UK households. They are popular because they keep things simple and are able to heat both the central heating system and the water supply from the same unit.

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Flow temperature

The flow temperature on a combi boiler is the temperature of the water that is sent to the radiators.

The average household has this set at between 75°C and 80°C, but it does not actually need to be this high. In fact, combi boilers work best when the water going to the radiators is around 60°C.

Save money

Assuming that it is currently set to between 75 and 80°C, reducing the flow temperature to 60°C would reduce gas consumption by around 9%, resulting in a potential annual saving of around £100. There wouldn’t be a noticeable difference either.

The exact saving amount will depend on how much you lower the setting as well as how much you use your heating and hot water.

How to change the flow settings

The majority of combi boilers will have two dials – one for hot water, and one for heating. You should be able to simply turn these to adjust the flow temperature. If you have digital controls, consult your manual for instructions on how to change the flow temperature.

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Local help and advice

If you are having issues with your boiler or just want it to be given a general check-up, there is plenty of choice when it comes to choosing a boiler service in Cheltenham and the surrounding area. There are a number of specialist local firms, many of whom have excellent online resources for you to read such as those seen at hprservicesltd.com/cheltenham-boilers/boiler-service-cheltenham/.

What are the advantages of a combi boiler?

Combi boilers have a number of advantages over more conventional systems. Firstly, they are more efficient and can therefore save a considerable amount on heating bills. In addition, they save space and are easier to install since they do not need a hot water tank and have fewer parts.