A condensing boiler is a type of water heating system that captures the energy released from a boiler stack. It takes the heat from the condensed liquid and uses it to preheat the water entering the boiler. Thanks to this feature, the condensing boiler is one of the most efficient boiler systems out there. That said, there are still ways to further improve the efficiency of said systems, and most of them come with maintenance. 

In this article, we will tackle the things you can do to improve your condensing boiler’s efficiency.

 1. Clean the area 

One of the best ways to maximise your condensing boiler’s performance is to ensure the area around it, and even the boiler itself, is clean. This includes vacuuming up and clearing out debris, ensuring there is not anything near the boiler. With less stuff interfering with the boiler, the better it will be at warming up the water for your facilities. During your cleaning efforts, you may discover hidden issues that you can address to improve its efficiency further.

 2. Check for leaks

If there is one problem you do not want your boiler to have, it’s finding a leak. Leaks anywhere will not only severely hurt your boiler’s performance and efficiency, but it can be an accident waiting to happen. As such, you must inspect your condensing boiler for any types of leaks, whether it be gas leaks, water leaks and so on. If you do discover any leaks, do have them fixed right away by boiler technicians. Wasting any time here will not only incur more energy costs, but the problem can go worse and worse.

 3. Inspect the water meter

Your boiler needs water to run. More importantly, it needs to have the right amount of water. If it has too little water, it is going to overwork itself, outputting little while taking up a lot of your resources. For this reason, you must take a look at the water meter occasionally. If it indicates water levels that are too low, then you will need to top it off. Be sure to follow the instruction manual for the boiler to follow the correct procedure for this action.

4. Maintain the heat exchanger

The main way any boiler will heat water is through its heat exchangers. It works by transferring heat from gas or electricity to the water through radiators, which is later pumped into the rest of your facilities. A fault in your heat exchanger can mean that the boiler is not efficiently heating the water, meaning it is underperforming. With that said, if your heat exchangers are experiencing a problem, have them addressed right away. Clean them and hire a technician to inspect for further problems.


There is a lot of effort and work to be put into maximising your boilers’ efficiency, especially if it is a condensing boiler. With more parts at play, the likelihood of problems developing is much higher, meaning you need to put more effort into maintaining them properly. That being said, the best way to ensure your condensing boiler performs at its best is to have annual inspections run frequently. This way, problems can quickly be caught and addressed, and ways to improve its performance can be implemented to maximise your boiler’s efficiency.

London Climate Hire is a team of HVAC specialists, offering a wide variety of high-quality boiler rental solutions to satisfy any need. If you are looking to rent a boiler in London, check out what we have to offer.