Difference Between Combi Boiler and System Boiler: Which Is Best for You?

If you’re shopping for a new boiler, you are probably weighing the difference between a combi boiler and a system boiler. These are the 2 most common types of boilers that we Canadians use. But knowing which one to invest in can help you save space and money in the long run. 

In this blog, we’ll break down what each type does and how they compare. Let’s help you narrow down on one choice.

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What is a Combi Boiler?

A combi boiler, as the name suggests, is a combination boiler. This is the type that provides you with eating, as well as hot water from just one compact unit.

Combi boilers do not use any separate water tank. When you need it, it heats the water. Which means you get instant hot water on demand. 

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Pros

• Great for smaller homes.
• Saves space as it’s not large.
• Heats water only when needed.

Things to keep in mind

• Water pressure depends on your home’s mains pressure.
• It cannot always handle multiple hot taps running at once.

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What is a System Boiler?

A system boiler is similar in how it provides heating and hot water. The difference is, it stores hot water in a separate cylinder. That’s why it’s great for homes that have multiple bathrooms. Install this boiler in homes where hot water is needed more often. 

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Pros

• Strong water pressure at multiple outlets.
• No need for a cold water tank in the attic.
• Works well with solar heating.

Things to keep in mind

• Needs more space for the hot water cylinder.
• You have to wait for water to reheat if it runs out.

Combi Boiler vs System Boiler:  Main Differences

Here’s a quick side-by-side look at combi boiler vs system boiler to help make the differences clearer:

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Combi vs System Boiler: Efficiency

If we are to look at the two systems in terms of efficiency, both can be great. Both boilers have modern condensing models as well. But combi boilers have an edge. Because they only heat water when needed.

So, you don’t have to worry about wasting water. Also, less wastage means better efficiency.

System boilers are often turned on for long hours. That’s why they lose some heat from the hot water cylinder over time. For bigger homes and buildings that use a lot of hot water, system boilers have better overall efficiency.

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Running Costs: Combi vs System Boiler

The running costs depend on the size of the home and how much the boiler is being used. Here, you can take the help of a professional like Surrey Plumbing and Heating.

• Combi boilers are cheaper to run in smaller homes because there’s no stored water to keep warm. This reduces energy bills.
• System boilers can save running costs in homes with high water usage. If a lot of people use it at the same time, this can yield lower running costs as well.

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Which Boiler Should You Choose?

Here’s a simple way to decide which boiler to choose: 

• Choose a combi boiler if you live in a smaller home, only have one bathroom, and want instant hot water without a tank.
• Choose a system boiler if you have a larger household, more than one bathroom, and need hot water from multiple taps at once.

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Conclusion

Now that you know the difference between combi boiler and system boiler, you can confidently choose the right system for your home. See what you prioritize. Do you want to save space, need more efficiency or need a strong water flow? 

If you’re still unsure which one would be the best option, then reach out to your local experts for professional advice and installation support.

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