Combi Boiler Hot Water Temperature Too Hot? Try These Steps

Hot water is great and nothing beats a nice hot shower in the morning, but what if your shower is causing you to leap out due to third degree burns from boiling water? Well, that’s not a good way to start the day. A combi boiler producing water that’s too hot is not an uncommon issue. Check below for a full list of all the things to check.

Combi (combination) boilers combine the functions of a central heating system and a water heater into one device. There is no storage tank with this sort of boiler, and the water is heated directly from the mains supply. Because of its design and compact size, combi boilers are used in the majority of modern homes. However, this does not rule out the possibility of your combi boiler breaking down at some point.

In most cases, your combi boiler generates heated water. After a long day, a hot bath might help you relax. But what should you do if the water temperature has increased significantly since you purchased your new combi boiler? Should you take the chance of getting burned? Certainly not.

Is Your Combi Boiler Water Too Hot?

There can be plenty of reasons for a boiler to start overheating the water. Faulty wiring or a circuit defect could cause this anomaly. Take a look at some of the most prominent reasons that cause this failure of water temperature.

Temperature Dial Mixup

You might easily mistake the temperature dials on your combi boiler if it has one for central heating and another for water heating. When altering the temperature, be careful which dial you use. If your boiler becomes too hot after adjusting the temperature dials, turn it off and wait a few minutes before restarting it. Then, to check if anything changes, lower the temperature a little lower than before. If nothing changes, the dials are broken or there is an internal problem that can only be diagnosed and fixed by a skilled gas safe engineer.

Broken Thermostat

A thermostat regulates the temperature of the water and the room. For most households, the optimal temperature is around 21°. Your combi boiler’s temperature is controlled by a thermostat, so if it stops working, you’ll need to call in a registered engineer. A malfunctioning thermostat may produce temperature misreadings.

It is not recommended that you attempt to repair or replace a thermostat on your own. Even basic thermostat failures require professional hands to repair, therefore you should always call in an engineer to help you with this type of problem.

Incorrect Flow Rate

The flow rate of a combi boiler should be between 10 and 12 litres per minute. Water will heat up more if the flow rate is too slow. If your boiler’s flow rate is below average, get it adjusted by a competent expert. A serious malfunction can disrupt the flow rate, which is why it’s critical to get the appliance inspected by an expert.

When It’s Time To Call A Qualified Engineer

Heating engineers can often fix common boiler problems that cause your water to become too hot for a small fee, but if your boiler is particularly old and the repair cost is upwards of £300, it’s definitely worth looking into the cost of replacing your boiler, as they’re much more prone to future breakdowns.

It’s possible that the savings on your energy bill will cover the cost. Paying for a new boiler outright might be a financial strain, but boilers on financing are becoming increasingly common.

Know When It’s Time To Get A New Combi Boiler

If your boiler keeps suffering from an unbalanced temperature, why not switch to a new model? There are many high-quality combi boilers available and attractive prices to be found.

It may appear to be an expensive answer, but boiler repairs are costly unless you get boiler insurance, especially if you have to have the same problems repaired often. It will also be significantly more energy-efficient and safe.

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Last Updated on November 7, 2021

Frequently Asked Questions

What temperature should the hot water be on a combi boiler?

The general recommended setting for a combi boiler is to set the home heating dial to 75 degrees and your hot water to about 60 degrees for maximum efficiency. No one likes third degree burns.

How hot is too hot for tap water?

It is generally recommended that tap water shouldn’t be more than 49 degrees Celsius (120 Fahrenheit). If the temperature exceeds this mark, it can cause severe damage to the human skin. But everyone is different some will prefer it a bit cooler.

What temperature should the hot water be on a combi boiler?

It is effortless and convenient to change the temperature on these appliances. The ideal temperature that you should stick to is 75 Degrees Celsius for the radiators and 60 degrees celsius for the water that is flowing inside. It is neither too high nor too low


Author: Indra Gupta

Indra is an in-house writer with a love of Newcastle United and all things sustainable.

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