condesing boiler

Today, many of the old and outdated non-condensing boilers have been replaced with state-of-the-art condensing boilers for various reasons. For instance, non-condensing boilers have shown to be around 70% efficient, while condensing boilers have been near 100% efficient. These advantages make them the go-to solution for many uses, but unfortunately, many myths have spawned that have left people second-guessing the idea of investing in condensing boilers.

Are you on the fence about investing in condensing boilers because of a claim someone has made about it? If so, we want to tackle the various common myths that surround condensing boilers to help you understand why they’re false:

Myth 1. The Hot Water Reset Doesn’t Work

Do you know what a hot water reset is? It is when the hot water supply is reset based on the outside air condition. The theory is that as the external temperatures increase, the space load’s heat requirement also decreases. In the process, as the space load decreases, the temperature needed to heat water to warm the space also drops, meaning that less energy is spent on heating the water thanks to the lower temperature requirement. What the myth is trying to say here is that a hot water reset doesn’t work, meaning that this whole idea is nonsense. Fortunately, that isn’t true. A hot water reset functionality is already built right into the condensing boilers. Not only does it simply mean that the reset works, but it is already implemented within the system.

Myth 2. Condensing Boilers Are Much Harder To Maintain

Many people argue that condensing boilers require way more maintenance than traditional non-condensing boilers. However, the fact remains that condensing boilers require just as much maintenance as any other boiler out there. In fact, new condensing boilers may require even less maintenance as the materials used to build them are much more durable. This also helps extend the condensing boiler’s lifespan, making them a better investment long-term.

Myth 3. The Water’s Temperature Is the Defining Point for Efficiency

Sure, the water’s temperature does affect the heating coil’s size. However, it isn’t the defining factor of it all. Boiler efficiency mainly depends on the hot water return temperature because any condensation at the heat exchanger will depend on the water’s original temperature and the flue gas temperature. In the flue gas, waste heat is stored to preheat any cold water reentering the water boiler, which is something condensing boilers employ. As such, this pre-treated water already goes up in temperature before reaching the boiler, putting less work on the boiler itself. This is why condensing boilers are incredibly efficient and are at least 25% more efficient than their non-condensing counterparts!


If any of these myths have previously stopped you from investing in condensing boilers, we hope that you’ve changed your minds. Condensing boilers are incredibly efficient and what they do, and they will provide you with long-term benefits that will outweigh the initial investment you have made in them. That said, if you are looking to invest in condensing boilers, always reach out to HVAC specialists for any more information if need be. They can educate you on the latest heating solutions, ensuring that you get the heating solution you need to keep your property comfortably warm at all times.

London Climate Hire are HVAC specialists providing various services from emergency boiler hire, heater rentals, portable AC hire, and more to meet any needs. If you are looking for reliable boiler hire in London to meet your heating needs, work with us today!