Guide to Gas Boilers:condensing gas boiler

Table of Content

  1. Introduction
  2. What is a condensing gas boiler?
  3. Is a condensing boiler the same as a combi boiler?
  4. What are the disadvantages of a condensing boiler?
  5. Are condensing boilers worth it?
  6. How long do condensing boilers last?
  7. Which type of boiler is most efficient?
  8. Which type of boiler is best?
  9. Is a combi boiler cheaper to run than a condensing boiler?
  10. How do I know if my boiler is a condensing boiler?
  11. Can you replace a conventional boiler with a condensing boiler?
  12. How much do you save with a condensing boiler?
  13. Conclusion


If you’re planning to replace your boiler, it’s time to consider a condensing gas boiler. This is because they have become far more efficient than regular boilers, which use 80% less energy and produce 80-90% less carbon dioxide than standard boilers.

Condensing boilers are also known as ‘combi’ or ‘combination’ boilers. They combine the benefits of both conventional and condensing technology in one unit – so you get lower running costs, higher efficiency and improved environmental performance all at once!

What is a condensing gas boiler?

A condensing boiler is a type of boiler that is more efficient than a standard boiler. It takes advantage of the fact that water evaporates at room temperature, so when you boil water in your kitchen, some of the steam goes into your kitchen and cools down. The water then condenses back into its liquid form. This can be seen as droplets on top of your kettle or pot when it boils.

What does this mean for my home? You could save money on your energy bills if you install one in your home because it’s more efficient than other types of boilers and uses less fuel to produce heat (gas).

Is a condensing boiler the same as a combi boiler?

As you can see, a condensing boiler is not the same thing as a combined boiler. A combined boiler is a condenser and boiler in one unit.

A combi boiler is more efficient than an ordinary gas or electric one, because it’s able to convert some of the heat that would normally be wasted into hot water.

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Guide to Gas Boilers:condensing gas boiler

What are the disadvantages of a condensing boiler?

Any time you’re dealing with an appliance in your home, there are going to be some disadvantages. The same is true for the condensing boilers from Viessmann.

The main disadvantage of a condensing boiler is that it needs more maintenance than conventional boilers, but it’s not hard to do this regular maintenance. One other disadvantage is that they cost more than conventionally fired boilers because they have better technology and performance capabilities. However, they also last longer than most conventional boilers so if you plan on keeping your home for several years or more then this will even out since you won’t have to replace it as often (and therefore save money). Another disadvantage is that these types of systems tend to be harder to install than traditional ones so if you live alone or don’t know much about plumbing then I recommend getting help from a professional before attempting this installation yourself! Finally there isn’t any real downside beyond having an extra expense every year in order keep everything working properly.”

Are condensing boilers worth it?

The short answer: they’re more efficient, but more expensive to install and run.

To understand why this is, let’s take a look at how a conventional boiler works. A conventional boiler uses up fuel to heat water in an enclosed space (called a furnace). As the water heats up inside the furnace, it turns into gas – which then exits through valves at either end of your home’s heating system. The problem with this design is that not all of the energy in that fuel can be used by your home. A lot of energy gets lost as waste heat because some energy needs to be used just to keep things going in your heating system (for example: keeping pipes from freezing). This means that when you turn on your central heating system during winter months, most of what you pay for isn’t actually being used for heating purposes; instead, it’s being wasted as excess heat!

How long do condensing boilers last?

You’ll find that most condensing boilers last for around 15 years, but this is a very rough estimate. Since there are so many factors that go into how long any appliance will last, it’s difficult to determine exactly when yours will die. It all really depends on how much you use your boiler and what kind of quality you get from it. If you’re looking for a more precise figure than 15 years, here are a few things to keep in mind:

  • The average lifespan of a boiler is roughly 15 years (7-20).
  • The life expectancy varies depending on how often the unit is in use (high usage shortens lifespan).

Which type of boiler is most efficient?

There are a number of different types of boilers available, which can make choosing the right one an overwhelming task. In order to help you make a more informed decision and choose wisely, we’re going to break down each type and discuss the pros and cons.

Condensing boiler: Condensing boilers use less fuel than other types because they run at such low temperatures; this means that they lose less heat through their pipes. The water in these systems is also kept at a higher temperature than conventional models, so it doesn’t have as far to travel before reaching your radiators or hot water tank. This helps reduce energy costs even further!

Combi boiler: Combi boilers work by heating both your hot water supply as well as your central heating system at once – although this can be an appealing prospect for people who live in colder climates where heating needs are high year-round (like Scotland), they may not provide enough heat if you live somewhere with milder winters like south-west England where temperatures rarely drop below zero degrees Celsius

Which type of boiler is best?

Condensing boilers are the more efficient option and therefore the best choice for most people, but that does not mean that combi boilers are useless. They will save you money in the long run, even if they cost slightly more to buy in the first place. However, if you’re looking for a boiler with all of the bells and whistles—in other words one where energy efficiency is top of mind—then a condensing boiler is definitely better suited for your needs.

Is a combi boiler cheaper to run than a condensing boiler?

When you compare the running costs of a condensing boiler with a combi, the difference is stark.

  • A combi boiler is more expensive to buy
  • A combi boiler is more expensive to install
  • A combi boiler is more expensive to run
  • A combi boiler is more expensive to service
  • A combi boiler is more expensive to repair

Combis are also significantly pricier than their condensing counterparts when it comes to decommissioning and disposal.

How do I know if my boiler is a condensing boiler?

If you’re not sure whether your boiler is a condensing boiler, there are a few places to check.

  • Look for the condensing boiler symbol. The Condensing Appliance Manufacturer’s Association (CAMA) has created an internationally recognized symbol that indicates a product is designed to be a condensing appliance. If you see this symbol somewhere on your appliance, it means that it should be able to function as a condensing appliance if it’s properly installed and maintained.
  • Check your documentation: If you have documentation for your specific model of boiler, it will likely list whether or not it can be used as part of a system with another type of appliance or accessory (like radiators). You can also ask someone who works in plumbing or with heating systems—they should know which products are compatible with each other!
  • Check the nameplate: The nameplate on top of each piece of equipment typically lists information about what kind of equipment it is and often includes codes specifying whether or not an item qualifies as “condensing.” The manufacturer may also include other useful information such as serial numbers; those numbers could help when contacting customer service representatives who handle repairs on existing installations because they’ll need this info when researching problems reported by homeowners like yourself!

Can you replace a conventional boiler with a condensing boiler?

Yes, you can replace a conventional boiler with a condensing boiler. However, you will need to check your boiler’s size and the space you have available. You also need to consider whether there is enough room for an increased flue size and if it is possible to achieve the desired flue length without creating issues such as blocked windows or doorways.

If you are replacing an existing system, then it is essential that any replacement parts are compatible with those already in place before making any changes as this could result in further complications down the line.

How much do you save with a condensing boiler?

The amount you save with a condensing boiler depends on your fuel costs. If you have an old boiler, you will save money. This is because the efficiency of older boilers is lower and they will produce more heat than necessary. On the other hand, if you have a new boiler that uses less energy to heat water then there may not be any savings at all.

The best way to work out how much money you could save with a condensing boiler is by calculating how much you would spend over time on gas or oil for heating your home or business premises before doing so. To do this simply take into account:

  • The cost of installing the new system itself (this can vary depending on whether or not it needs replacing)
  • Annual maintenance costs associated with running such systems (these are usually around 15% per annum though this varies)
  • Capital cost depreciation factors which need applying based upon how long it takes before these systems start earning back their initial investment through lower fuel bills


The cost of installing a condensing boiler is more than the cost of a new regular boiler, but it will save you money in the long run. If you’re considering a new boiler, we would recommend getting one that’s fitted with condensing technology.

If you want to know more about the price and cost of condensing boiler, please contact us via email or whatsApp+86 188-3890-8339.

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