5 Tips To Prevent Condensate Pipe Freezing

picture of a condensate pipe freezing

Preventing Condensate Pipe Freezing: Tips and Solutions

​One of the most frustrating things that can happen in the middle of winter is having your condensate pipe freezing on you. Not only is it a pain to thaw out, but it can also be expensive if you have to call a professional to do it for you. Luckily, there are some things you can do to prevent your condensate pipe freezing in the first place.

In this blog post, we will explain why a condensate pipe freezes, how you can prevent your condensate pipe freezing and tips on how to reduce the risk of freezing.


How to Reduce The Risk Of Condensate Pipe Freezing

​Condensate pipe freezing is a major problem for many homeowners in the UK, as it can lead to boiler repairs in the middle of winter when you need it most.. There are a number of strategies that you can use to reduce the risk of condensate pipe freezing, including:

1. Maintaining proper insulation: This is one of the most important steps that homeowners can take to prevent condensate pipe freezing. Proper insulation will help to maintain the temperature of the condensate pipes, and prevent them from freezing.

2. Keeping the area around the condensate pipes clear: Another important step that you can take is to keep the area around the condensate pipes clear. This will help to prevent the pipes from being damaged by snow or ice, and will also help to reduce the risk of freezing.

3. Heating the condensate pipes: One of the most effective ways to prevent condensate pipe freezing is to heat the pipes. This can be done using electric heat tape or other similar products.

4. If the condensate pipe is fitted externally, it is imperative that the diameter of the pipe is increased to a minimum of 32mm to help reduce the possibility of the pipe from freezing.

5.  Consider relocating the condensate pipe internally: If possible, consider relocating the pipe internally as this will help reduce the risk of it freezing at all. You would be best consulting a professional gas engineer to determine the best location for the pipe.

While there are no guarantees that these strategies will completely prevent condensate pipe freezing, they can significantly reduce the risk. Homeowners that are concerned about this issue should take steps to implement these strategies



picture of a condensate pipe freezing


If you do find yourself with a frozen condensate pipe, don’t panic! Just follow these steps to thaw it out:

1. Turn off your boiler – You don’t want the frozen pipe to thaw too quickly and cause a mess or damage to your home.

2. Apply heat to the frozen section of the pipe – You can use a hair dryer or a heat lamp.  Just be careful not to overdo it and melt the plastic piping. If the condensate pipe is external, you can use hot water to unfreeze the pipe.

3. Use hot water – This can help speed up the thawing process. Just pour hot water over the frozen section of the pipe and wait for it to melt.

4. Call a professional – If you’re not comfortable thawing out the pipe yourself, or if it’s not working, you can always call a professional to do it for you.

How Does Condensate Pipe Freezing Occur?

Condensate pipe freezing occurs due to low temperatures affecting the water vapour expelled from condensing boilers. In cold weather, the water vapour in the condensate pipe can freeze, leading to blockages and potential boiler malfunctions.

Insufficient insulation or poor pipe positioning increase the risk, impeding the flow of condensate. This freezing phenomenon is particularly common in exposed external pipes.

To prevent condensate pipe freezing, homeowners can install proper insulation, ensure a consistent slope for drainage, and undertake regular maintenance, safeguarding their heating system’s efficiency during winter months.

picture of a condensate pipe with insulation

Other Tips to Prevent Condensate Pipes from Freezing

​On a cold winter day, the last thing you want is for your condensate pipe to freeze. Here are a few other tips to prevent your condensate pipe from freezing:

-Keep the area around your boiler and condensate pipe well-insulated. This will help to keep the heat in and the cold out.

-If you have an outdoor condensate pipe, make sure it is well-insulated and protected from the elements.

-If your boiler is equipped with a condensate pump, make sure it is working properly and that the float switch is not stuck.

-If you think your condensate pipe might be frozen, thaw it out gradually with a hair dryer or heat lamp. Do not use a torch or open flame as this could damage the pipe.

Best Insulation To Help Prevent Condensate Pipe Freezing

​Selecting the right insulation is crucial to prevent condensate pipe freezing and maintain optimal boiler performance during cold weather. There are a few different types of insulation that can be used to help prevent the condensate pipe freezing however, here are a couple that we think would be the best.

Standard foam insulation tubes come in grey and you should be using at least 35mm in diameter to cover the condensate pipe and give it the insulation it needs. Armacell 35mm  insulation is a self seal insulation that retains it’s thermal properties over a long period of time and would be a great fit for insulating an external condensate pipe.

Another option would be to use condensate pro. The condensate pro insulation pack is ideal for protection against condensate pipe freezing. The insulation has been specially designed for easy cutting, mitering and bonding.

Whichever insulation that you do choose, you should ensure that once it is fitted to the pipe, you fit the securing bracket over the insulation to ensure that it does not come off during windy weather.



We hope that you got some value from reading this blog post and that you are now aware of some small things that you can do yourself to help protect your condensate pipe freezing in the middle of winter. It is imperative that external condensate pipes are protected by the cold weather. It is also important that they have a sufficient drop to ensure that the fluid runs into the drain properly.

A poorly fitted condensate pipe could potentially run back into the boiler during excessive periods of rain. If you are in any doubt about whether your condensate pipe is fitted correctly, you can contact us to come out and take a look for you.

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