What Is Boiler Frost Heating Protection & How Does It Work

The water in your boiler needs protection from freezing to avoid damage. If not protected, the water will freeze inside the boiler, and it will stop working. 

Modern boilers come with frost protection feature to prevent such damage. This feature will turn your boiler on every time the temperature of the water decreases too low. Let’s learn more about frost heating protection.     

What is Boiler Frost Heating Protection?

Boiler frost heating protection prevents the water inside the unit from freezing. It turns on the boiler in case the water’s temperature drops below a certain level. Once the boiler heats the water to a safer level, it automatically turns the unit off. You will find the frost heating protection feature in most modern boilers available in the market.  

How does boiler protection work? 

Here is how boiler frost protection works: 

  1. The temperature of the water in the boiler will go below the ideal level that is 5 degrees. 
  2. The boiler will turn on automatically to heat the water. 
  3. It will turn off once the water’s temperature drops to at least 10 degrees Celsius.  

If your water boiler does not have the frost protection feature, you can buy a separate frost protection thermostat. Or you can also buy a new boiler and replace the old one to get better features. Just make sure the boilers get enough power supply if you want the frost protection to activate.  

Will boiler frost protection increase my energy bills?

Since the boiler needs to be turned on for frost protection, your electricity bill will probably increase. However, without frost protection, you are saving a lot of money from the damages caused in its absence. 

Also, the water temperature needs to drop to 5 degrees Celsius for the feature to work, which is quite difficult during hot weather. 

What happens when a central heating system freezes?

If your central heating system freezes, it can cause serious damage to the system that would require repairing or even replacement. Sometimes, when the pipework is not in the visible areas, you won’t even know that your pipe have frozen. Even the boiler won’t work if your central heating is system freezes.  

If your central heating system gets freeze, it can cause: 

  • Water damage 
  • Burst Pipes 
  • System blockage 

Boiler Frost Protection Thermostat Temperature

You need to make sure that the temperature of your boiler frost protection thermostat is set at 5 degrees. Once the water reaches a temperature level safe enough to prevent freezing, the system will shut down. 

A Thermostat comes in handy when your boiler does not have a frost protection feature. You can purchase a thermostat as they are easily available in the market at reasonable prices.  

Insulate Your Pipes for Added Frost Protection

Insulating the pipes in your central heating system can also work as frost protection for your boiler. 

If you insulate hot water pipes, it will prevent the water from freezing and even keep it warmer for a longer period. With this, your electricity bills will decrease as the central heating system will use less energy. 

You can also wrap your pipes with a jacket that will only cost around £5 per meter. Moreover, wrapping the pipes in lagging will also be an ideal option if you want to keep your energy bills low. 

Last Updated on April 11, 2021

Frequently Asked Questions

What is the ideal temperature for frost protection?

The ideal temperature of the thermostat for frost protection is 5 degrees Celsius. It means when the water’s temperature reaches 5 degrees, the boiler will fire up to avoid freezing.

What temperature do pipes freeze?

Usually, the water pipes in your house start freezing when the temperature fall to 0 degrees Celsius or below. It can happen due to unsheltered pipes or when the pipes are not insulated properly.

What is the frost setting on the radiator?

The frost setting on a radiator helps you protect from frost by turning on the radiator when the temperature drops to 6 degrees Celsius. You can turn the valve to adjust the setting, which is usually between 1 and 5.

A cooler temperature would work fine for a bedroom, but it’d be best to set it at 3 or 4 if you are in a living room.

Can you turn the boiler off at night?

Boilers often turn on at night, reflecting a significant increase in your electricity bill. And most people, to save some money, turn their boilers off at night, which is not an efficient option. If you shut it off, you will have to turn on the system every morning, costing you a lot of time and effort.

As for the energy, modern boilers do not use much power when they are not in use. So you can invest your money in a new unit and avoid the hassle in the morning.

David Thompson

Author: David Thompson

Dave has been involved in the UK building sector for over 3 decades and has developed a particular interest in energy efficiency in the home.

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